Page 2 - User’s Manual
Series 988 User’s Manual Includes 986, 987, 988 and 989 The Series 988 User’s Manual is copyrighted by Watlow Winona, Inc., © 1997, with all rights reserved. (1233)
Page 3 - Table of Contents; Appendix
WATLOW Series 988 User’s Manual Table of Contents Table of Contents Introduction to the Watlow Series 988Controllers ii Using this Manual ii Document Every Step iii Notes, Cautions and Warnings iii Technical Assistance iii We Value Your Feedback Chapter 1Hardware Setup 1.1 Dip Switch Locations and F...
Page 4 - Introduction to the
WATLOW Series 988 User’s Manual i Introduction Introduction to the Watlow Series 988 Controllers Figure Int.1 - The Series 988Controllers. Watlow’s Series 988 controllers set a new standard in the controller indus-try by packing an impressive array of features into an 1/8-DIN package.No other contro...
Page 5 - Introduction; Using this Manual
ii WATLOW Series 988 User’s Manual Introduction Introduction Using this Manual This manual provides the information you will need to install and operatea Series 988 controller. If you need information about Series 988 configurations and model num-bers, refer to the Appendix of this manual or, for mo...
Page 6 - Notes, Cautions and Warnings
Introduction WATLOW Series 988 User’s Manual iii Introduction Notes, Cautions and Warnings We use note, caution and warning symbols throughout this book to drawyour attention to important operational and safety information. A bold text “ NOTE ” marks a short message in the margin to alert you to an ...
Page 7 - Chapter 1; Hardware Setup; DIP Switch Locations and Functions
WATLOW Series 988 User’s Manual 1.1 Hardware Setup, Chapter 1 Chapter 1 Hardware Setup DIP Switch Locations and Functions The Watlow Series 988 has at least one and as many as six dual in-linepackage (DIP) switches inside the controller, depending on the modelnumber. They allow users to configure th...
Page 8 - DIP Switches; Input 1
1.2 WATLOW Series 988 User’s Manual Hardware Setup, Chapter 1 DIP Switches Figure 1.2 - Input DIP switches. Input 1 Input 2 (98 _ _-2_ _ _-_ _ _ _) (98 _ _-_2_ _-_ _ _ _) RTD (100 Ω ) thermocouple: R, S or B thermocouple: J, K, T, N, E, C, D, Pt2 or 0-50mV (high impedance) 0-20 or 4-20mA; 0-5, 1-5 o...
Page 11 - Chapter 2; Installation and Wiring
WATLOW Series 988 User’s Manual 2.1 Installation and Wiring, Chapter 2 Chapter 2 Installation and Wiring Panel Cutout Maximum Panel Thickness 0.38" (9.65mm) 3.62" + 0.03 -0.00 (92mm + 0.8) 1.77 + 0.02 -0.00 (45mm + 0.6) 4.03" (102mm) 2.18" (55 mm) TL W WA PROCESS L1 L2 L3 L4 DEV % OU...
Page 12 - Installation; Installing the Series 988
2.2 WATLOW Series 988 User’s Manual Installation and Wiring, Chapter 2 Installation Installing the Series 988 Installing and mounting requires access to the back of the panel. 1. Make a panel cutout using the panel cutout dimensions from the previ- ous page. 2. To remove the controller chassis from ...
Page 13 - To guarantee a proper NEMA 4X seal, Series 986 and 988; of the unit. When installing Series 987 and 989 units (horizon-; To ensure a
WATLOW Series 988 User’s Manual 2.3 Installation and Wiring, Chapter 2 the mounting collar over the back of the control. 4. Loosen the mounting bracket screws enough to allow for the mounting collar and panel thickness. Place each mounting bracket into themounting slots (head of the screw facing the...
Page 14 - Wiring; Wiring the Series 988; Power Wiring
2.4 WATLOW Series 988 User’s Manual Installation and Wiring, Chapter 2 Wiring Wiring the Series 988 Wiring options depend on the model number and DIP switch settings.Check the terminal designation stickers on either side of the controllerand compare your model number to those shown here and with the...
Page 15 - Sensor Installation Guidelines
WATLOW Series 988 User’s Manual 2.5 Installation and Wiring, Chapter 2 Wiring Sensor Installation Guidelines Maintain isolation between input 1 and input 2 to prevent a ground loop.A ground loop may cause incorrect readings, dashes across the upper dis-play or the display of error codes. Thermocoupl...
Page 16 - Wiring Example
2.6 WATLOW Series 988 User’s Manual Installation and Wiring, Chapter 2 Wiring Example Figure 2.6 - System wiringexample. 988A-10CA-AARR rear view (+) 1 0 9 2 2 2 1 1 2 1 3 (-) L1 L2 (-) 120V Å (ac ) fuse 92A3-1DJ1-0000 limit control heater process sensor limit sensor optional normally open momentary...
Page 17 - Wiring Notes
WATLOW Series 988 User’s Manual 2.7 Installation and Wiring, Chapter 2 Wiring Notes L1 L2 power earth ground 11 21 22 ç WARNING:To avoid damage toproperty and equip-ment, and/or injuryof loss of life, useNational ElectricCode (NEC) stan-dard wiring prac-tices to install andoperate the Series988. Fai...
Page 18 - Input 1 Wiring
2.8 WATLOW Series 988 User’s Manual Installation and Wiring, Chapter 2 Input 1 Wiring Figure 2.8c — 0-5V Î Î , 1-5V Î Î or 0-10V Î Î (dc) Process Universal signal conditioner 98 _ _ - 2 _ _ _ - _ _ _ _ Input impedance: 10K Ω Figure 2.8a — Thermocouple or 0-50mV (high impedance) Thermocouple only 98 ...
Page 19 - Input 2 Wiring
Figure 2.9d — 0-20mA or 4-20mA Process Universal signal conditioner 98 _ _ - _ 2 _ _ - _ _ _ _ Input impedance: 7 Ω Figure 2.9c — 0-5V Î Î , 1-5V Î Î or 0-10V Î Î (dc) Process Universal signal conditioner 98 _ _ - _ 2 _ _ - _ _ _ _ Input impedance: 10K Ω Figure 2.9b — RTD (2- or 3-wire) (100 Ω ) Uni...
Page 20 - Current Transformer Input; Digital Event Input 2; Slidewire Feedback or Potentiometer Input
20 19 T3 T1 T2 Phase dot 3-phase using 2 current transformers Figure 2.10b — Current Transformer Input 98 _ _ - _ 4 _ _ - _ _ _ _ The current transformer must be pur-chased separately. See Appendix forWatlow current transformer partnumbers. Systems that use more than 50 Ampsneed an interstage transf...
Page 21 - Digital Event Input 1; Event Input 1 Wiring
WATLOW Series 988 User’s Manual 2.11 Installation and Wiring, Chapter 2 Figure 2.11a — Digital Event Input 1 Available on all units. open 14-36V Î (dc) Event Input 1 off closed 0-3V Î (dc) Event Input 1 on 23 24 + - 24 23 +24V Î (dc) 10K Ω 4.99K Ω OPTOISOLATOR 750 Ω .01 µ f 4.99K Ω Internal Circuitr...
Page 22 - AC Outputs; Output 1 Wiring; Switched DC, Open Collector
2.12 WATLOW Series 988 User’s Manual Installation and Wiring, Chapter 2 Figure 2.12a — AC Outputs Solid-state Relay with Contact Suppression 98 _ _ - _ _ B _ - _ _ _ _ 0.5 amps, minimum off-state impedance: 20K Ω Electromechanical Relay with Contact Suppression (Suppression between NO and COM contac...
Page 23 - Output 2 Wiring; External Signal Conditioner Power Supply
WATLOW Series 988 User’s Manual 2.13 Installation and Wiring, Chapter 2 Output 2 Wiring Figure 2.13b — Switched DC, Open Collector 98 _ _ - _ _ _ C - _ _ _ _ Maximum voltage: 42V Î Î (dc) Maximum current: 1A 15 External Load + 16 17 - COM Figure 2.13d — 0-5V Î Î , 1-5V Î Î and 0-10V Î Î (dc) Process...
Page 24 - Process Retransmit; Switched DC; Output 3 Wiring
Figure 2.14c — Process Retransmit 0-20mA, 4-20mA, Load impedance: 600 Ω max. 98 _ _ - _ _ _ _ - M _ _ _ 0-5V Î Î , 1-5V Î Î , 0-10V Î Î (VDC) , Load impedance: 500 Ω min. 98 _ _ - _ _ _ _ - N _ _ _ 2.14 WATLOW Series 988 User’s Manual Installation and Wiring, Chapter 2 NOTE:Input-to-output iso-latio...
Page 25 - Output 4 Wiring; For data communications wiring refer to
WATLOW Series 988 User’s Manual 2.15 Installation and Wiring, Chapter 2 Figure 2.15b — Switched DC, Open Collector 98 _ _ - _ _ _ _ - _ C _ _ Maximum voltage: 42V Î Î (dc) Maximum current: 1A Figure 2.15a — AC Outputs Solid-state Relay with Contact Suppression 98 _ _ - _ _ _ _ - _ B _ _ 0.5 amps, mi...
Page 26 - Chapter 3; Front Panel and Display Loop; Upper Display; Display Key; Mode Key; Keys and Displays
WATLOW Series 988 User’s Manual 3.1 Front Panel and Display Loop, Chapter 3 Chapter 3 Front Panel and Display Loop Upper Display Indicates the actual process value,prompt parameter value or errorcode. DEV LED When lit, the lower display showsthe most recent deviation unit fromthe set point. % OUT LE...
Page 27 - Display Loop
3.2 WATLOW Series 988 User’s Manual Front Panel and Display Loop, Chapter 3 Display Loop Display Loop The Display Loop is the “home” state of the Series 988 controller. Pressingthe Display key ∂ returns the controller to the Display Loop from any prompt in any menu. The controller automatically retu...
Page 28 - Navigating the Setup Menus; Chapter 4; The Setup Menus
TL W WA PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY SERIES 988 MODE AUTO MAN WATLOW Series 988 User’s Manual 4.1 Setup Menus, Chapter 4 Navigating the Setup Menus To reach the Setup Menus, begin in the Display Loop and press both the Up-arrow > and Down-arrow < keys for three seconds. The Setup Menu...
Page 29 - Reaching the Input Menu
4.2 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 MODE *Slidewire Hysteresis *Hunt *Linearization 2 *Software Filter 2 *RTD Calibration Curve 2 *Calibration Offset 2 *Learn High *Learn Low *Range High 2 *Range Low 2 *Decimal 2 *Remote Set Point *Input 2 *Linearization 1 Software Filter 1 *R...
Page 31 - Decimal 1; Select the decimal point location for process type input 1 data.
4.4 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 [`In1] Input 1 continuedfrom previouspage. Setup-Input If Default ↓ ↓ Input 1 DIP RTD RTD(0.1°) [`rtd] [`r†d] [`In1] [`In1] RTD Input 1 DIP 4-20mA 0-20mA 0-5V Î 1-5V Î 0-10V Î (dc) [4-20] [0-20] [`0-5] [`1-5] [0-10] [`In1] [`In1] [`In1] [`In...
Page 32 - Range Low 1 and Range High 1; Select the low and high limits for input 1.
WATLOW Series 988 User’s Manual 4.5 Setup Menus, Chapter 4 Setup-Input ˜ NOTE:These values do notaffect the low or thehigh set point limitfor process alarms. Range Low 1 and Range High 1 Select the low and high limits for input 1. These prompts limit the adjustment range for the set points. The defa...
Page 33 - only; Calibration Offset 1; Offset the input 1 signal by a positive or negative value.
4.6 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Input ˜ NOTE:These values do notaffect the low or thehigh set point limitfor process alarms. [`rL1][`rH1] Range Low 1 andRange High 1continued fromprevious page. [``°F] [``°C] [`rL1] [`rH1] [`rL1] [`rH1] [```r] [``32] … [3200] [```0] …...
Page 34 - ) Calibration Curve 1; Select the calibration curve for the RTD 1 input.; Software Filter 1
WATLOW Series 988 User’s Manual 4.7 Setup Menus, Chapter 4 Setup-Input RTD (100 Ω ) Calibration Curve 1 Select the calibration curve for the RTD 1 input. The RTD input uses either the European (DIN, 0.003850 Ω / Ω /°C) or the Japanese (JIS, 0.003916 Ω / Ω /°C) linearization standard. [rtd1] This pro...
Page 35 - Linearization 1; Select square root linearization for input 1.
4.8 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Input Linearization 1 Select square root linearization for input 1. [Lin1] This prompt appears only if you have set [`In1] to a process input or to a thermocouple set to [0-50] mV. Default ↓ [``no] [root] [Lin1] [Lin1] ˜ NOTE:See Chapt...
Page 36 - Input 2
WATLOW Series 988 User’s Manual 4.9 Setup Menus, Chapter 4 Setup-Input ˜ NOTE:If [``no] is selected for [`In2] none of the other input 2prompts willappear. Input 2 Select sensor type for input 2. This selection must match the sensor type connected to terminals 18, 19 and 20. See Appendix for more in...
Page 37 - Remote Set Point; Enable a remote set point signal.
4.10 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Input [`In2] Input 2 continuedfrom previouspage. If Default ↓ ↓ 98_ _-3_ _ _-_ _ _ _ no DIP slidewire potentiometer [``no] [SLid] [`POt] resistance [``In2] [`In2] [`In2] only 98_ _-4_ _ _-_ _ _ _ no DIP current current [``no] [SLid] t...
Page 38 - Decimal 2; Select the decimal point location for process type input 2 data.; Range Low 2 and Range High 2; Select the low and high limits for input 2.
WATLOW Series 988 User’s Manual 4.11 Setup Menus, Chapter 4 Setup-Input Decimal 2 Select the decimal point location for process type input 2 data. This prompt, in conjunction with the Range Low and Range High prompts,allows you to format and limit units of measure for process 2. • All prompts with u...
Page 40 - Learn Low; Learn High
WATLOW Series 988 User’s Manual 4.13 Setup Menus, Chapter 4 Setup-Input ˜ NOTE:See Chapter 8 for more informationon slidewire feed-back. Learn Low Write the low-end resistance of the slidewire potentiometer to therange low 2 parameter. [LrnL] This prompt appears only on controllers equipped with inp...
Page 41 - Calibration Offset 2; Offset the input 2 signal by a positive or negative value.; RTD Calibration Curve 2; Select the calibration curve for the RTD 2 input.
4.14 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Input [CAL2] [rtd2] Calibration Offset 2 Offset the input 2 signal by a positive or negative value. This allows you to compensate for lead resistance, sensor errors or other factors. [CAL2] This prompt appears only if the controller i...
Page 42 - Software Filter 2; Linearization 2; Select square root linearization for input 2.
Software Filter 2 Select the filter time constant, in seconds, for input 2. This smooths a rapidly changing input signal for display or control purposes. • Select a positive value to filter only the display. • Select a negative value to filter the input signal. • Set the value to [```0] to disable t...
Page 43 - Hunt
4.16 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Input ˜ NOTE:See Chapter 8 for more informationon slidewire feed-back. [Hunt] Hunt Set the deadband, as a percentage of output, to keep the valve fromhunting. • The slidewire hysteresis [SHYS] setting provides additional control over ...
Page 44 - Slidewire Hysteresis
WATLOW Series 988 User’s Manual 4.17 Setup Menus, Chapter 4 Figure 4.17 - Hunt and slidewireinner hysteresis. Hunt SlidewireHy s t eres is t urn-of f point (open) t urn-of f point (c los e) t urn-on point (open) t urn-on point (c los e) s lidewire pos it ion s et point Setup-Input ˜ NOTE:See Chapter...
Page 45 - Reaching the Output Menu
4.18 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output MODE *Hysteresis 4 *Alarm 4 Side *Alarm 4 *Output 4 *Silencing 3 *Latching 3 *Hysteresis 3 *Alarm 3 Side *Alarm 3 *Output 3 *Silencing 2 *Latching 2 *Alarm 2 Side *Alarm 2 *Set Point 2 Control *Hysteresis 2 *Output 2 *Process 2...
Page 46 - Output Prompts
WATLOW Series 988 User’s Manual 4.19 Setup Menus, Chapter 4 Setup-Output Output Prompts When you are in the Setup menus, the Series 988 displays the menuselection ( [InPt] , [OtPt] , [GLbL] or [COM] ) in the upper display, and [`SEt] in the lower display. The Up-arrow > or Down-arrow key < sel...
Page 47 - Process 1; Select the process range for output 1.; Hysteresis 1; Select the switching hysteresis for output 1.
4.20 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output Process 1 Select the process range for output 1. [Prc1] This prompt appears only on controllers equipped with output 1 process hardware (98_ _-_ _F_-_ _ _ _). Default ↓ 4-20mA 0-20mA 0-5V Î 1-5V Î 0-10V Î (dc) [4-20] [0-20] [`0...
Page 48 - Process 2; Select the process range for output 2.
WATLOW Series 988 User’s Manual 4.21 Setup Menus, Chapter 4 Setup-Output Output 2 Set the way that output 2 will respond to a difference between the setpoint and an input variable. • [`AL2] de-energizes output 2 in an alarm condition. • [AL2n] energizes output 2 in an alarm condition. • [``Ht] selec...
Page 49 - Hysteresis 2; Select the switching hysteresis for output 2.; Set Point 2 Control; Select a second set point.
4.22 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output Hysteresis 2 Select the switching hysteresis for output 2. This determines the change in temperature or process units needed to turn the output from offto on. • If [`AL2] is set to [rAtE] settings for [HYS2] will be in degrees ...
Page 50 - Alarm 2; Select the alarm type for alarm 2.; Alarm 2 Side; Select what triggers alarm 2.
WATLOW Series 988 User’s Manual 4.23 Setup Menus, Chapter 4 Setup-Output Alarm 2 Select the alarm type for alarm 2. Select the trigger points for the alarm with the [A2LO] and [A2HI] settings in the System Menu [`SYS] . • [`Pr1] uses the process signal from input 1. Changing the set point does not c...
Page 51 - Latching 2; Select whether alarm 2 will be latching or non-latching.; Silencing 2
4.24 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output Latching 2 Select whether alarm 2 will be latching or non-latching. A latching alarm [`LAt] must be turned off manually. A non-latching alarm [`nLA] turns off when an alarm condition no longer exists. [LAt2] This prompt appears...
Page 52 - Output 3; Select the alarm condition for output 3.; Alarm 3; Select the alarm type for alarm 3.
WATLOW Series 988 User’s Manual 4.25 Setup Menus, Chapter 4 Setup-Output Output 3 Select the alarm condition for output 3. • [`AL3] de-energizes output 3 in an alarm condition. • [AL3n] energizes output 3 in an alarm condition. [`Ot3] This prompt appears only on controllers equipped with output 3 ha...
Page 53 - Alarm 3 Side; Select what triggers alarm 3.; Hysteresis 3; Select the switching hysteresis for alarm 3.
4.26 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output Alarm 3 Side Select what triggers alarm 3. • [both] triggers an alarm when the signal ≤ [A3LO] or ≥ [A3HI] . • [HiGH] triggers an alarm when the signal ≥ [A3HI] . • [LOW] triggers an alarm when the signal ≤ [A3LO] . [A3Sd] This...
Page 54 - Latching 3; Select whether alarm 3 will be latching or non-latching.; Silencing 3
WATLOW Series 988 User’s Manual 4.27 Setup Menus, Chapter 4 Setup-Output Latching 3 Select whether alarm 3 will be latching or non-latching. A latching alarm [`LAt] must be turned off manually. A non-latching alarm [`nLA] turns off when an alarm condition no longer exists. [LAt3] This prompt appears...
Page 55 - Output 4; Select the alarm condition for output 4.; Alarm 4; Select the alarm type for alarm 4.
4.28 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output Output 4 Select the alarm condition for output 4. • [`AL4] de-energizes output 4 in an alarm condition. • [AL4n] energizes output 4 in an alarm condition. [`Ot4] This prompt appears only on controllers equipped with output 4 ha...
Page 56 - Alarm 4 Side; Select what triggers alarm 4.
WATLOW Series 988 User’s Manual 4.29 Setup Menus, Chapter 4 Setup-Output Alarm 4 Side Select what triggers alarm 4. • [both] triggers an alarm when the signal ≤ [A4LO] or ≥ [A4HI] . • [HiGH] triggers an alarm when the signal ≥ [A4HI] . • [LOW] triggers an alarm when the signal ≤ [A4LO] . [A4Sd] This...
Page 57 - Hysteresis 4; Select the switching hysteresis for alarm 4.; Latching 4; Select whether alarm 4 will be latching or non-latching.
4.30 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output Hysteresis 4 Select the switching hysteresis for alarm 4. This determines the change in temperature or process units needed to turn the output from off to on. • If [`AL4] is set to [rAtE] settings for [HYS4] will be in degrees ...
Page 58 - Silencing 4; Analog Output; Select which value to retransmit as the output 3 signal.
WATLOW Series 988 User’s Manual 4.31 Setup Menus, Chapter 4 Setup-Output Silencing 4 Select silencing to inhibit alarm 4 on startup and to allow the opera-tor to reset the alarm output, not the visual display. • Silencing disables the alarm until the signal is between [A4LO] and [A4HI] . [SIL4] This...
Page 59 - Process 3; Select the range for the retransmit signal at output 3.; Retransmit Low Limit; Select the low limit for the retransmit signal at output 3.
4.32 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Output Process 3 Select the range for the retransmit signal at output 3. [Prc3] This prompt appears only on controllers equipped with retransmit hardware (98_ _-_ _ _ _-M_ _ _ or 98_ _-_ _ _ _-N_ _ _) and with [Aout] not set to [``no]...
Page 60 - Retransmit High Limit; Select the high limit for the retransmit signal at output 3.; Retransmit Calibration Offset; Select an offset value for the retransmit signal at output 3.
WATLOW Series 988 User’s Manual 4.33 Setup Menus, Chapter 4 Setup-Output Retransmit High Limit Select the high limit for the retransmit signal at output 3. • The default value is equal to [`rH1] or [`rH2] (in the Input Menu) depending on whether [Aout] is set to [Prc1] or [Prc2] . • The decimal prec...
Page 61 - Reaching the Global Menu
MODE *Ramp Rate *Ramping Function Auto-tune Set Point High Power Limit Low Power Limit Annunciator *Event Input 2 Event Input 1 *Crossover Process Value *PID 2 Crossover Selection *Algorithm *Control Type *Cascade Action Setup prompt *Celsius-Fahrenheit Failure Mode Error Latching Enter your setting...
Page 62 - Global Prompts; Select which temperature scale the controller will use.; Failure Mode
WATLOW Series 988 User’s Manual 4.35 Setup Menus, Chapter 4 Setup-Global Global Prompts When you are in the Setup menus, the Series 988 displays the menuselection ( [InPt] , [OtPt] , [GLbL] or [COM] ) in the upper display, and [`SEt] in the lower display. The Up-arrow > or Down-arrow key < sel...
Page 63 - Error Latching; Select whether errors will be latching or non-latching.; Control Type; Select a control method: normal
4.36 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Global Error Latching Select whether errors will be latching or non-latching. • Non-latching alarms [`nLA] turn off when there is no alarm condition. • Latching alarms [`LAt] must be turned off manually. [`Err] This prompt always appe...
Page 64 - Cascade Action
WATLOW Series 988 User’s Manual 4.37 Setup Menus, Chapter 4 Setup-Global Cascade Action Select the control action between the inner and outer loop of a cas-cade system. • Direct action [`dir] makes the percent output from the outer loop directly proportional to the set point of the inner loop (input...
Page 65 - Algorithm; Select the control algorithm.; PID 2 Crossover Selection
4.38 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Global Algorithm Select the control algorithm. • [`Pid] selects one set of PID prompts. • [`Pdr] selects proportional/derivative control with manual reset in per- cent power. • [Pid2] selects two complete sets of PID prompts. This sel...
Page 66 - Crossover Process Value; Crossover Set Point Value
WATLOW Series 988 User’s Manual 4.39 Setup Menus, Chapter 4 Setup-Global Crossover Process Value Select the process value at which the control algorithm will crossoverbetween PID A and PID B. PID A is active below this value and PID B is active above this value. • This value cannot be set lower than...
Page 67 - Event Input 1; Select the effect of closing the event input 1 switch.; Event Input 2; Select the effect of closing the event input 2 switch.
4.40 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Global Event Input 1 Select the effect of closing the event input 1 switch. • [``no] disables event input 1. • [`LOC] locks out the front panel keys. • [`ALr] resets an alarm. • [A-M] switches the controller to manual mode at the powe...
Page 68 - Annunciator; Select whether alarm messages will flash in the lower display.; Low Power Limit; Select the low limit for the percent output.
WATLOW Series 988 User’s Manual 4.41 Setup Menus, Chapter 4 Setup-Global Annunciator Select whether alarm messages will flash in the lower display. [Anun] This prompt always appears. Default ↓ [``on] [`OFF] [Anun] [Anun] Low Power Limit Select the low limit for the percent output. For cooling (direc...
Page 69 - High Power Limit; Select the high limit for the percent output.
4.42 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Global High Power Limit Select the high limit for the percent output. For cooling (direct acting) enter a negative number. [`HiP] This prompt always appears. If Default ↓ ↓ [`LoP] … [`100] % a heat/cool [`HiP] [`HiP] application [`LoP...
Page 70 - Ramping Function; Select when the controller will ramp.; Ramp Rate; Select the ramping rate in degrees per minute.
WATLOW Series 988 User’s Manual 4.43 Setup Menus, Chapter 4 Setup-Global Ramping Function Select when the controller will ramp. Ramping limits the speed at which an element can heat up. Ramping is often used to protect parts thatwould crack or warp if they heat up too quickly. • [`OFF] sets the syst...
Page 71 - Reaching the Communications Menu
4.44 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Comm ˜ NOTE:The Communications Menuappears only on controllersequipped with communicationshardware (98_ _-_ _ _ _-_R_ _,98 _ _-_ _ _ _-_U_ _ or 98_ _-_ __ _-_S_ _). See Data Communications with the Series 988 Family ofControllers for ...
Page 72 - Communications Prompts; Select the communications speed.; Data Bits and Parity
WATLOW Series 988 User’s Manual 4.45 Setup Menus, Chapter 4 Setup-Comm Communications Prompts When you are in the Setup menus, the Series 988 displays the menuselection ( [InPt] , [OtPt] , [GLbL] or [COM] ) in the upper display, and [`SEt] in the lower display. The Up-arrow > or Down-arrow key &l...
Page 73 - Protocol Type; Select the communications protocol.; Address; Select an address for the controller.
4.46 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Comm Protocol Type Select the communications protocol. • [FULL] selects ANSI X3.28 2.2 - A.3. • [``on] selects Xon/Xoff. • [Mod] selects Modbus [Prot] This prompt appears only on controllers equipped with communi- cations hardware (98...
Page 74 - Select the interface type for Output 4, Option S.; Interface Type; Select the interface type for Output 4, Option U.
WATLOW Series 988 User’s Manual 4.47 Setup Menus, Chapter 4 Setup-Comm Interface Type Select the interface type for Output 4, Option S. • [`485] selects EIA/TIA-485. • [`422] selects EIA/TIA-422. [IntF] This prompt appears only on controllers equipped with communications hardware for EIA/TIA-485 and...
Page 75 - Navigating the Operation Menus; Chapter 5; The Operation Menus
TL W WA PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY SERIES 988 MODE AUTO MAN WATLOW Series 988 User’s Manual 5.1 Operation Menus, Chapter 5 Navigating the Operation Menus To reach the Operation Menus, begin in the Display Loop and press theMode key µ . Depending on the controller configuration, either the...
Page 76 - Reaching the System Menu
5.2 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 MODE *Local-remote *Alarm 4 High *Alarm 4 Low *Alarm 3 High *Alarm 2 High *Alarm 3 Low Operation Prompt *Event Input 1 Status *Event Input 2 Status *Alarm 2 Low Enter your settings,from the controller's upper display. MODE MODE MODE MODE...
Page 77 - System Prompts; Select a second set point that will activate output 2.; Idle Set Point; Select the set point to be activated by an event input.
Operation-System WATLOW Series 988 User’s Manual 5.3 Operation Menus, Chapter 5 System Prompts After you step past the Set Point 2 prompt [`SP2] and the Idle Set Point prompt [IdSP] to the Operation menus, the Series 988 displays the menu selection ( [`SYS] , [PidA] or [PidB] ) in the upper display ...
Page 78 - Event Input 1 Status; Select the low trigger value for the output 2 alarm.
5.4 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 Operation-System Event Input 1 Status Indicates whether the event input 1 circuit is open or closed (readonly). [Ei1S] This prompt appears only if [`Ei1] (Global Menu) is set to some- thing other than [``no] . Default ↓ [OpEn] [CLOS] [Ei...
Page 79 - Alarm 2 High; Select the high trigger value for the output 2 alarm.; Alarm 3 Low; Select the low trigger value for the output 3 alarm.
WATLOW Series 988 User’s Manual 5.5 Operation Menus, Chapter 5 Operation-System Alarm 2 High Select the high trigger value for the output 2 alarm. [A2HI] This prompt appears only if [`AL2] (Output Menu) is set to some- thing other than [``no] . If Default ↓ ↓ highest [`Pr1] or [`pr2] [A2LO] … value ...
Page 80 - Alarm 3 High; Select the high trigger value for the output 3 alarm.; Alarm 4 Low; Select the low trigger value for the output 4 alarm.
5.6 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 Operation-System Alarm 3 High Select the high trigger value for the output 3 alarm. [A3HI] This prompt appears only if [`AL3] (Output Menu) is set to some- thing other than [``no] . If Default ↓ ↓ highest [`Pr1] or [`pr2] [A3LO] … value ...
Page 81 - Alarm 4 High; Select the high trigger value for the output 4 alarm.
WATLOW Series 988 User’s Manual 5.7 Operation Menus, Chapter 5 Operation-System Alarm 4 High Select the high trigger value for the output 4 alarm. [A4HI] This prompt appears only if [`AL4] (Output Menu) is set to some- thing other than [``no] . If Default ↓ ↓ highest [`Pr1] or [`pr2] [A4LO] … value ...
Page 82 - Select a local or remote set point.
5.8 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 Local-remote Select a local or remote set point. With [```r] selected the controller displays the remote set point rather than the internal (local) set point, andthe set point cannot be changed with the Up-arrow or Down-arrow key. [`L-r]...
Page 83 - Reaching the PID Menus
MODE *Cycle Time, Output 1B *Rate, Output 1B *Derivative, Output 1B *Operation Prompt *Proportional Band, Output 1B *Reset, Output 1B *Integral, Output 1B Enter your settings,from the controller's upper display. MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE Output 2 (p. 5.13) Output 1 ...
Page 84 - PID A or PID B Prompts; Select the proportional band for PID output 1.
5.10 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 Operation-PID A or B PID A or PID B Prompts After you step past the Set Point 2 prompt [`SP2] and the Idle Set Point prompt [IdSP] to the Operation menus, the Series 988 displays the menu selection ( [`SYS] , [PidA] or [Pidb] ) in the u...
Page 85 - Reset, Output 1A or 1B; Integral, Output 1A or 1B
WATLOW Series 988 User’s Manual 5.11 Operation Menus, Chapter 5 Operation-PID A or B Reset, Output 1A or 1B Tune reset to eliminate the offset or droop between the set point andthe actual process temperature for PID output 1. When set to [```0] reset is disabled. [rE1A] This prompt appears only if [...
Page 86 - Rate, Output 1A or 1B; Derivative, Output 1A or 1B
5.12 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 Operation-PID A or B Rate, Output 1A or 1B Adjust the rate to eliminate overshoot on startup or after the setpoint changes. The rate setting will not influence the percent power if the process temperature is more than twice the proporti...
Page 87 - Cycle Time, Output 1A or 1B; Proportional Band, Output 2A or 2B; Select the proportional band for PID output 2.
WATLOW Series 988 User’s Manual 5.13 Operation Menus, Chapter 5 Operation-PID A or B Cycle Time, Output 1A or 1B Select the time, in seconds, of a complete on/off cycle. [Ct1A] This prompt appears only if [`In1] (Input Menu) is not set to a process, [CntL] (Global Menu) is not set to [CSCd] and [Pb1...
Page 88 - Reset, Output 2A or 2B; Integral, Output 2A or 2B
5.14 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 Operation-PID A or B Reset, Output 2A or 2B Tune reset to eliminate the offset or droop between the set point andthe actual process temperature for PID A output 2. When set to [```0] reset is disabled. [rE2A] This prompt appears only if...
Page 89 - Derivative, Output 2A or 2B
WATLOW Series 988 User’s Manual 5.15 Operation Menus, Chapter 5 Operation-PID A or B Rate, Output 2 Adjust the rate to eliminate overshoot on startup or after the setpoint changes. The rate setting will not influence the percent power if the process temperature is more than twice the proportional ba...
Page 90 - Cycle Time, Output 2A or 2B; Dead Band A or B
5.16 WATLOW Series 988 User’s Manual Operation Menus, Chapter 5 Operation-PID A or B Cycle Time, Output 2A or 2B Select the time, in seconds, of a complete on/off cycle. [Ct2A] This prompt appears only if [CntL] (Global Menu) is not set to [CSCd] and [Pb2A] is set higher than [```0] . If Default ↓ ↓...
Page 91 - Navigating the Factory Menus; Chapter 6; The Factory Menus
TL W WA PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY SERIES 988 MODE AUTO MAN WATLOW Series 988 User’s Manual 6.1 Factory Menus, Chapter 6 Navigating the Factory Menus To reach the Factory Menus, begin in the Display Loop and press the Up-arrow > and Down-arrow < keys together and hold for three seco...
Page 92 - Factory-Panel Lockout
6.2 WATLOW Series 988 User’s Manual Factory Menus, Chapter 6 ? ? ? ? ? ? ? ? ? ? [`LOC] [`SYS] [PidA] [PidB] [Inpt] [Otpt] [GlbL] [COM] [Diag] [`CAL] MODE Factory Prompt Enter your settings,from the controller’s upper display. MODE MODE MODE MODE MODE MODE MODE MODE MODE MODE Front Panel Lockout Sys...
Page 93 - Panel Lockout Prompts; Sets the Lockout level for the Front Panel.
Factory-Panel Lockout WATLOW Series 988 User’s Manual 6.3 Factory Menus, Chapter 6 Panel Lockout Prompts When you are in the Factory menus, the Series 988 displays the menuselection ( [PLOC] , [diAg] or [`CAL] ) in the upper display and [FctY] in the lower display. The Up-arrow > or Down-arrow ke...
Page 94 - System Menu; Select the lockout level for the System Menu.; PID A Menu; Select the lockout level for the PID A Menu.; PID B Menu; Select the lockout level for the PID B Menu.
6.4 WATLOW Series 988 User’s Manual Factory Menus, Chapter 6 Factory-Panel Lockout System Menu Select the lockout level for the System Menu. Set the System Menu lockout to no lockout [none] , read only [read] or full lockout [FULL] . [`LOC] This prompt always appears. Default ↓ [none] [read] [FULL] ...
Page 95 - Input Menu; Select the lockout level for the Input Menu.; Output Menu; Select the lockout level for the Output Menu.; Global Menu; Select the lockout level for the Global Menu.
WATLOW Series 988 User’s Manual 6.5 Factory Menus, Chapter 6 Factory-Panel Lockout Input Menu Select the lockout level for the Input Menu. Set the Input Menu lock- out to no lockout [none] , read only [read] or full lockout [FULL] . [InPt] This prompt always appears. Default ↓ [none] [read] [FULL] [...
Page 96 - Communications Menu; Select the lockout level for the Communications Menu.; Diagnostics Menu; Select the lockout level for the Diagnostics Menu.; Calibration Menu; Select the lockout level for the Calibration Menu.
6.6 WATLOW Series 988 User’s Manual Factory Menus, Chapter 6 Factory-Panel Lockout Communications Menu Select the lockout level for the Communications Menu. Set the Communications Menu lockout to no lockout [none] , read only [read] or full lockout [FULL] . [COM] This prompt appears only on controll...
Page 97 - Reaching the Diagnostics Menu
WATLOW Series 988 User’s Manual 6.7 Factory Menus, Chapter 6 Factory-Diagnostics Reaching the Diagnostics Menu ❷ Use the Up-arrow > key to step from the Panel Lockout Menu [PLOC] to the Diagnostics Menu [diag] . ❶ Press the Up-arrow > and Down-arrow < keys together and hold until the [`SEt]...
Page 98 - Factory Ship Date; Shows the date that the final factory control test was performed.; Software Revision; Shows the controller’s software revision code when set to; Serial Number; Shows the controller’s serial number.; Ambient Temperature; Shows the ambient temperature at the Input 1 terminals.
6.8 WATLOW Series 988 User’s Manual Factory Menus, Chapter 6 Factory Ship Date Shows the date that the final factory control test was performed. The first two digits represent the week as numbered from [01--] to [52--] . The second two digits represent the year [--94] , [--95] , etc… [dAtE] This pro...
Page 99 - Factory Use Only; These prompts are used only at the factory.; Inputs 1 and 2 Module Types; Displays which input module is installed in the controller.
WATLOW Series 988 User’s Manual 6.9 Factory Menus, Chapter 6 Factory-Diagnostics [acnt][`gnd][cnt1][cnt2] Factory Use Only These prompts are used only at the factory. [Acnt] [`gnd] [cnt1] [cnt2] These prompts always appear. Inputs 1 and 2 Module Types Displays which input module is installed in the ...
Page 100 - Display the controller’s output module.
6.10 WATLOW Series 988 User’s Manual Factory Menus, Chapter 6 Factory-Diagnostics Outputs 1, 2, 3 and 4 Module Types Display the controller’s output module. Please document this value before contacting the factory for technical assistance. Output Types • [none] no output module (A) • [SSr1] 0.5A sol...
Page 101 - Test Displays; Runs a brief test of the controller’s displays and LEDs.; Test Outputs; This prompt tests each output.
WATLOW Series 988 User’s Manual 6.11 Factory Menus, Chapter 6 Factory-Diagnostics Test Displays Runs a brief test of the controller’s displays and LEDs. To run the test, scroll through the Diagnostics Menu until [disp] is shown in the lower display. Use the Up-arrow key > or Down-arrow key < t...
Page 102 - Open Loop
6.12 WATLOW Series 988 User’s Manual Factory Menus, Chapter 6 Factory-Diagnostic Open Loop Checks the control loop, consisting of the controller output, powercontrol, heater and sensor. With open loop enabled, the controller moni- tors the output power level and checks for a change in the process in...
Page 104 - Restore; Restores the original factory calibration values when set to
Factory Menus, Chapter 6 6.14 WATLOW Series 988 User’s Manual Restore Restores the original factory calibration values when set to [[` `Y YE ES S]] . This is a simple way to recover from a mistake made while calibrating thecontroller. [`rSt] This prompt always appears. Default ↓ [``no] [`yes] [`rSt]...
Page 105 - Alarms and Error Codes
WATLOW Series 988 User’s Manual 7.1 Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Auto-tuning (Heat and/or Cool) The Series 988 can automatically tune the PID parameters to fit the char-acteristics of your particular thermal system. Standard software units (98_ A -_ _ _ _-_ _ _ _) have...
Page 106 - key; Manual Tuning; parameters may need to be tuned also. Perform this
7.2 WATLOW Series 988 User’s Manual Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Tuning When the control finishes “learning” the system, it resumes standard PIDcontrol using the PID values established by the auto-tuning process.Changing the set point during an auto-tune restarts the a...
Page 107 - Apply power to the Series 988
WATLOW Series 988 User’s Manual 7.3 Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Tuning 1. Apply power to the Series 988 and enter a set point. Begin with [``Pb] set to [```1] ; [``rE] or [``It] set to [`0)0] ; [``rA] or [``dE] set to [`0)0] ; [``Ct] set to [``%0] ; [`CAL] set to [```...
Page 108 - Manual and Automatic Operation
7.4 WATLOW Series 988 User’s Manual Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Auto/Man Manual and Automatic Operation To change from auto to manual operation, press the Auto/Man key å twice. Manual operation provides open-loop control of the outputs from a rangeof -100% to 100% out...
Page 109 - Alarms; Changing the Output 3 Alarm Jumper; Controller Chassis - Top View
WATLOW Series 988 User’s Manual 7.5 Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Alarms 3. Return the controller chassis to the case. Be sure you have it oriented correctly. Press firmly, but gently, to seat the chassis. If you select Form A, the contact is open when power is removed ...
Page 110 - Using Alarms; process alarm
7.6 WATLOW Series 988 User’s Manual Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Alarms ˜ NOTE:An alarm displaywill be masked byan error conditionor when the controlis in the Calibrationor Setup menus. Using Alarms Output 2, 3, and 4 of the Series 988 can function as alarms. This isac...
Page 111 - rate alarm
WATLOW Series 988 User’s Manual 7.7 Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Alarms A rate alarm alerts the operator when the process monitored by input 1 is increasing at a rate higher than the alarm high setting ( [A2HI] , [A3HI] or [A4HI] ) or decreasing at a rate lower than th...
Page 112 - Error Codes; Error Code E1 and E2 Messages
7.8 WATLOW Series 988 User’s Manual Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Error Codes [E1`2] [E2`2] : Sensor under-range error The sensor at the input indicated by the first number generated a valuelower than that allowed for the range of the sensor, or the analog-to-digital(A/...
Page 113 - : Ambient temperature error; : RAM verification error; : Configuration error; Error Code Actions; All of the above error codes except; • If
WATLOW Series 988 User’s Manual 7.9 Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Error Codes [`Er3] : Ambient temperature error The ambient temperature of the Series 988 has dropped below 32°F/0°Cor risen above 149°F/65°C. Calibration errors can also cause this errorcode. Try setting ...
Page 114 - To clear an error code...; Error codes
7.10 WATLOW Series 988 User’s Manual Tuning, Manual Operation, Alarms and Error Codes, Chapter 7 Error Codes To clear an error code… • If [`Err] is set to [`nLA] , the error code should clear once the prob- lem is corrected. • If [`Err] is set to [`LAt] , correct the problem and cycle power. You can...
Page 115 - General Software
WATLOW Series 988 User’s Manual 8.1 General Software Features, Chapter 8 Chapter 8 General Software Burst Fire 8.2 Communications 8.4 Dead Band 8.6 Digital Events 8.8 Heater Current 8.10 Input Filter 8.12 Input Linearization 8.14 Ramp to Set Point 8.16 Remote Set Point 8.18 Retransmit 8.20 Slidewire...
Page 116 - Burst Fire; Requirements
8.2 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Burst Fire Requirements • This feature only works with zero-cross, solid-state devices. It will not function correctly with random-fire devices. • To enable burst fire the Series 988 must have an open collector...
Page 117 - Sample Application
WATLOW Series 988 User’s Manual 8.3 General Software Features, Chapter 8 General Software TL W WA PROCESS L1 L2 L3 L4 DEV % OUT DISPLAY MODE AUTO MAN SERIES 988 input 1 out put 1 QPAC wit h QCD input limit S e mi c o n d u c t o r O v e n t emperat ures ens or limit s ens or heat ed plat en 50% outp...
Page 118 - Communications
8.4 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Communications Requirements Choose which interface your application will use: EIA/TIA-232 serial com-munications (98_ _-_ _ _ _-_R_ _), EIA/TIA-485 or EIA/TIA 232 serial com-munications (98_ _-_ _ _ _-_U_ _), o...
Page 120 - Dead Band
8.6 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Dead Band Requirements The dead band feature is standard on any Series 988 controller with twocontrol outputs. The dead band prompts will appear if the control outputsare configured for heat/cool or cool/heat. ...
Page 122 - Digital Events
8.8 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Digital Events Requirements A single digital event input is standard on all controls. A second digitalinput is available as an option for input 2 (98_ _-_5_ _-_ _ _ _). Overview The digital event input options ...
Page 124 - Heater Current
8.10 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Heater Current Requirements Choose the heater current option (98_ _-_4_ _-_ _ _ _) for input 2 and anappropriate current transformer. A current transformer must be orderedseparately. Output 1 cannot be used as...
Page 126 - Input Filter; Overview
8.12 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Input Filter Requirements This feature is standard on all Series 988 controllers. Overview In certain applications the process being measured can be unstable,which makes it difficult to control and also makes ...
Page 128 - Input Linearization
8.14 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Input Linearization Requirements The square root extraction feature is standard on any Series 988 con-troller with universal signal conditioner inputs. The linearization promptwill appear if a process input is...
Page 130 - Ramp To Set Point
8.16 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Ramp To Set Point Requirements This feature is standard on all units. Overview Ramp to set point enables the Series 988 to ramp the set point at a user-defined rate. This allows the controller to start up a sy...
Page 134 - Retransmit
8.20 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Retransmit Requirements Output 3 is used for the retransmit option. Choose either a milliamp (98__-_ _ _ _-M_ _ _) or a voltage (98_ _-_ _ _ _-N_ _ _) signal. Select the outputrange in the Output Menu. Overvie...
Page 135 - Sample Applications
WATLOW Series 988 User’s Manual 8.21 General Software Features, Chapter 8 General Software Sample Applications A Series 988 is being used to control the temperature of a heat-treat oven.The temperature of the process must be recorded on a chart recorder. Theoven temperature range stays between 600° ...
Page 136 - Slidewire Feedback
8.22 WATLOW Series 988 User’s Manual General Software Features, Chapter 8 General Software Slidewire Feedback Requirements A slidewire configuration uses at least two inputs and two control out-puts. Input 2 can only be selected as a slidewire input (98_ _-_3_ _-_ _ _ _). Overview The Series 988 can...
Page 138 - Enhanced Software; Cascade
WATLOW Series 988 User’s Manual 9.1 Enhanced Software Features, Chapter 9 Chapter 9 Enhanced Software Cascade 9.2 Differential 9.6 Dual PID 9.8 Duplex 9.10 Ratio 9.12
Page 140 - Setup
WATLOW Series 988 User’s Manual 9.3 Enhanced Software Features, Chapter 9 Enhanced Software ence between the set point and the process temperature generates aninternal percent output value for the second, or inner loop, controller. Thisvalue cannot be seen by the operator. This internal percent (% i...
Page 143 - Differential
9.6 WATLOW Series 988 User’s Manual Enhanced Software Features, Chapter 9 Enhanced Software Differential Requirements Two inputs and the enhanced software option are required. Overview Differential control allows the Series 988 to control one process at a differ-ence to another process. Input 2 acts...
Page 145 - Dual PID Sets
9.8 WATLOW Series 988 User’s Manual Enhanced Software Features, Chapter 9 Enhanced Software Dual PID Sets Requirements The Series 988 controller needs the enhanced software option to use dualPID sets. Overview Standard software units have a single set of PID parameters. Units withenhanced software c...
Page 147 - Duplex
9.10 WATLOW Series 988 User’s Manual Enhanced Software Features, Chapter 9 Enhanced Software Duplex Requirements The duplex control feature requires enhanced software and a process out-put. Overview Certain systems require that a single process output control both heatingand cooling outputs. A Serie...
Page 149 - Ratio
9.12 WATLOW Series 988 User’s Manual Enhanced Software Features, Chapter 9 Enhanced Software Ratio Requirements Ratio control requires enhanced software. Two analog inputs are requiredto monitor the process, and at least one output adjusts the controlled partof the process. Overview This feature all...
Page 154 - Specifications
A.4 WATLOW Series 988 User’s Manual Appendix Specifications Control Mode• Dual input, quad output, optional retransmit of setpoint or process variable. • Programmable direct and reverse acting control out-puts. • One-step auto-tuning. Operator Interface• Local/remote set point capability. • Dual, 4-...
Page 155 - Warranty
WATLOW Series 988 User’s Manual A.5 Appendix Warranty/Returns Warranty The Watlow Series 988 is warranted to be free ofdefects in material and workmanship for 36 monthsafter delivery to the first purchaser for use, providingthat the units have not been misapplied. SinceWatlow has no control over the...
Page 158 - Prompt Index
A.8 WATLOW Series 988 User’s Manual Appendix rate/derivative adjustment 7.3 ratio control 9.12 - 9.13 , A.3 reference junction A.2 relay, mechanical 7.2 release tabs 1.1 , 2.2 - 2.3 , 7.5 remote set point 4.10 , 8.8 , 8.18 - 8.19 removing controller chassis 1.1 , 2.2 - 2.3 , 7.5 reset output 1 5.11 ...
Page 159 - Index—prompts
WATLOW Series 988 User’s Manual A.9 Appendix [dEC2] (decimal 2) 4.11 [`dFL] (default) 6.14 [diAg] (Diagnostics Menu) 6.7 [diAg] (diagnostics lockout) 6.6 [diFF] (differential) 4.36 , 9.7 [`dir] (direct action) 4.37 [dISP] (test displays) 6.11 [dUPL] (duplex) 4.38 E [E1`1] (A/D underflow error) 7.8 [...
Page 160 - Menu Overview
SP2 IdSP Set point 2 Idle set point ( ) ( ) Operation OPEr ( ) Setup SEt ( ) Fcty Factory ( ) A.10 WATLOW Series 988 User’s Manual Appendix (SyS) Alarm 2 low Event input 2 status Alarm 2 high Alarm 3 low Alarm 3 high ( S y s t e m ) Event input 1 status Ei1S A2LO A2HI A3LO A3HI Ei2S A4LO AUt L-r A4H...
Page 161 - Model Number; Ordering Information
WATLOW Series 988 User’s Manual A.11 Appendix Model Number Ordering Information (1237) To order, complete the code number to the right with the information below: 9 8 _ _ - _ _ _ _ - _ _ _ _ Series 988: a single-channel, temperature/process controller, 1 analog input, 1 digital input, 1 analog or di...
Page 162 - Declaration of Conformity
A.12 WATLOW Series 988 User’s Manual Appendix Erwin D. Lowell Winona, Minnesota, USA Name of Authorized Representative Place of Issue General Manager January 9, 1996 Title of Authorized Representative Date of Issue ________________________________________Signature of Authorized Representative Declar...
Page 163 - Watlow Series 988 User’s Manual
Watlow Series 988 User’s Manual Watlow Controls, 1241 Bundy Blvd., P.O. Box 5580, Winona, MN 55987-5580, Phone: 507/454-5300, Fax: 507/452-4507