Watlow 987 - Manual

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 ...

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...

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...

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...

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 ...

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...

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...

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...

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...

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 ...

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...

Figure 2.10b — Current Transformer Input 98 _ _ - _ 4 _ _ - _ _ _ _ The current transformer must be purchased separately. Watlow currenttransformer part number 16-0246 (up to 50 amps). Systems that use more than 50 Amps need an interstage transformer.For example, if you use a 300A current transforme...

WATLOW Series 988 User’s Manual 2.11 Installation and Wiring, Chapter 2 Figure 2.10c — Digital Event Input 2 98 _ _ - _ 5 _ _ - _ _ _ _ open 0-3V Î (dc) Event Input 2 off closed 14-36V Î (dc) Event Input 2 on Figure 2.11a — Digital Event Input 1 Available on all units. open 14-36V Î (dc) Event Input...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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] …...

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...

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...

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...

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...

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...

WATLOW Series 988 User’s Manual 4.13 Setup Menus, Chapter 4 Setup-Input ˜ NOTE:See Chapter 8 formore 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 inpu...

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...

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...

4.16 WATLOW Series 988 User’s Manual Setup Menus, Chapter 4 Setup-Input ˜ NOTE:See Chapter 8 formore 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 a...

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...

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...

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...

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...

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...

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 ...

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...

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...

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...

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...

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...

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...

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...

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 ...

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...

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]...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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 ...

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...

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...

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...

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...

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...

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 ...

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...

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 ...

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 ...

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 ...

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 ...

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...

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 [...

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...

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...

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...

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...

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 ↓ ↓...

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...

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...

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...

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] ...

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] [...

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...

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]...

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...

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 ...

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...

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...

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]...

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...

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...

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...

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 ...

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...

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/...

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 ...

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...

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...

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...

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...

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. ...

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 ...

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...

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 ...

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...

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...

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...

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...

WATLOW Series 988 User’s Manual A.1 Appendix Appendix Glossary A.2 Specifications A.4 Warranty and Returns A.5 Index A.6 Menu Overview A.10 Model Number A.11 Declaration of Conformity A.12 C Appendix.wc 5/14/1999 8:33 AM Page A.1

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-...

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...

A.8 WATLOW Series 988 User’s Manual Appendix reset/integral adjustment 7.3restore 6.14retransmit 8.20 - 8.21, A.3retransmit calibration offset 4.33retransmit high limit 4.32retransmit low limit 4.32RTD A.3RTD calibration curve 1 4.7RTD calibration curve 2 4.14RTD input 2.5RTD wiring input 1 2.8input...

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 [`dir] (direct action) 4.37 [dISP] (test displays) 6.11 [dUPL] (duplex) 4.38 E [E1`1] (A/D underflow error) 7.8 [E2`1] ...

Fcty Factory ( ) A.10 WATLOW Series 988 User’s Manual Appendix ( S y S ) 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 A 2 L O A2HI A 3 L O A3HI Ei2S A 4 L O A U t L-r A4HI ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) A u t o - t u n e Al...

WATLOW Series 988 User’s Manual A.11 Appendix Model Number Ordering Information (1658) 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...

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...

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