Page 4 - Table of contents
STT40 / STT70 4 Table of contents 1. General Information ................................................................................................. 1-1 1.1. Warnings and symbols .......................................................................................... 1-11.2. Explanations and...
Page 6 - General Information 1-1; General Information
STT40 / STT70 General Information 1-1 1. General Information These operation instructions are addressed to all users of thisdevice.These operation instructions must be followed by every personworking on or with the unit. 1.1. Warnings and symbols The following warnings and symbols are used in these ...
Page 7 - General Information 1-2
STT40 / STT70 General Information 1-2 When disposing of drying agents / batteries / oil, observe allofficial rules. Caution: High noise pollution !For anyone working on the equipment, hearing protectionshould be worn.Avoid impairment of hearing! Caution: Danger of being crushed !Disconnect the equip...
Page 8 - General Information 1-3
STT40 / STT70 General Information 1-3 1.2. Explanations and information Various terms and designations are used in these operating instructions to ensure clarity.Therefore please note that the terms used in the text stand for the corresponding explanationslisted below. • Equipment: ”Equipment” can m...
Page 9 - Safety instructions 2-1; Safety instructions
STT40 / STT70 Safety instructions 2-1 2. Safety instructions These safety instructions apply to all persons around theoperating equipment.Please inform all persons around the operating equipment of thedirect and indirect hazards connected with it.These operation instructions are to be used by all pe...
Page 10 - Safety instructions 2-2
STT40 / STT70 Safety instructions 2-2 2.1 General The operating personnel of this equipment must be at least 16 years old. Please read these operation instructions carefully before operating the equipment for the firsttime. Contact us should questions arise. This avoids injury and damage to equipmen...
Page 11 - Safety instructions 2-3
STT40 / STT70 Safety instructions 2-3 2.1.1. Assembly Compare the connected loads with those of the main power supply. Danger, electrical shockhazard! When using lifting gear, please observe the pertaining regulations. Caution: Danger of accidents! Do not modify, add other equipment or change the de...
Page 12 - Safety instructions 2-4
STT40 / STT70 Safety instructions 2-4 2.1.3. Maintenance Before starting maintenance work, appoint a supervisor. Inform personnel responsible for the system before beginning maintenance work. Caution:Danger of accidents! Disconnect the equipment from main power supply before starting maintenance pro...
Page 13 - Safety instructions 2-5
STT40 / STT70 Safety instructions 2-5 2.2. For the safety of the device Never change settings without carefully assessing the consequences. Use only original Sterling spare parts. Observe the maintenance instructions. Keep a record of all maintenance work and repairs. Please note that electronic com...
Page 15 - The “run” signal lamp lights up.; For operation without timer clock:; The blower is running.
STT40 / STT70 Start up 3-2 3.1. Initial Operation Check whether the inlet of the drying hopper is closed by a lid or whether a conveyor unit(optional) is installed. If not, manufacture a suitable lid and install it on the inlet of the drying hopper or install theoptional conveyor unit. ) Attachments...
Page 16 - The “power” signal lamp turns off.
STT40 / STT70 Start up 3-3 Turn the “Hopper” release switches (ST1, ST2) to the “I” position.To set the drying temperature, turn the temperature controller to 176° F (+80 °C). Press the “PGM” key one time. Set the drying temperature to 176° F using the arrow keys. After 2 seconds, the display will f...
Page 17 - Fill at least half of the drying hopper with material.; The “run” signal lamp turns on.; For operation with the optional timer clock:; The blower is running at this point.
STT40 / STT70 Start up 3-4 3.2. Continuous Operation Note: To see a quick start guide for operation of this dryer seechapter 14. ) Fill at least half of the drying hopper with material. 3.2.1. Switching the Dryer on Turn on the dryers’ main power switch to the on position. The “run” signal lamp turn...
Page 19 - Autotuning the temperature controller
STT40 / STT70 Start up 3-6 Autotuning the temperature controller Press the “EXIT” key for at least 2 seconds. “tunE” flashes. Autotuning can take several minutes. If “tunE” stops flashing, Autotuning is finished. Press the “EXIT” key.
Page 21 - Error and error correction 4-1; Error and error correction
STT40 / STT70 Error and error correction 4-1 4. Error and error correction This chapter is directed at the operators of the equipment.It assumes the operator has general skills in dealing with dryingsystems and that the “start-up” description has been read andunderstood.Ensure in each and every case...
Page 22 - Error and error correction 4-2; Regeneration heater 1
STT40 / STT70 Error and error correction 4-2 The following errors can cause an alarm:Blower The blower pressure is too low.Check the blower.Vacuum sensor is defective. Regeneration heater 1 The safety temperature limiter on regeneration heater 1 has been activated.Check the safety temperature limite...
Page 25 - -Photocopy this page for your maintenance records –
STT40 / STT70 Maintenance 5-3 5.1. Maintenance schedule The checklist below contains a list of items which should be inspected and/or replaced to keepyour Dehumidifying Dryer operating at peak efficiency. Perform each inspection at the regularintervals listed below. System model # Serial # Every wee...
Page 26 - Recommendations for Cleaning and Replacing Filters
STT40 / STT70 Maintenance 5-4 5.2. Preventative Maintenance This section describes maintenance procedures which will increase the longevity and efficiency ofyour dehumidifying dryer. Perform them at the regular intervals listed on the dryer checklist onthe previous page. 5.2.1. Servicing Process Air...
Page 27 - Never operate the dryer without a return air filter.; Figure 1: Air Filter Location & Disassembly
STT40 / STT70 Maintenance 5-5 5.2.2. Cleaning or Replacing the Return Air Filter STT40 / STT70 • Detach the screw on the housing of the returnair filter and remove the housing cover. • Remove the nut of the filter cartridge. • Remove the filter cartridge. • Clean the inside of the return air filter ...
Page 29 - FIRST AID; In case of eye contact, immediately flush eyes; SEE A PHYSICIAN IMMEDIATELY IF IRRITATION PERSISTS.
STT40 / STT70 Maintenance 5-7 5.3. Corrective Maintenance This section provides you with the information necessary to correct or repair any issues whichmight appear during the normal operation of your dehumidifying dryer. Although we have listedhow to perform these procedures, it is recommended that...
Page 30 - Figure 2: Desiccant Bed Location and Disassembly; Remove
STT40 / STT70 Maintenance 5-8 5.3.2. Replacing Worn Desiccant • DESICCANT BEDS ARE HOT DURING OPERATION.To avoid burn hazard, make sure desiccant beds are sufficientlycool before replacing worn desiccant. To access the Desiccant Bed: 1. Disconnect electrical power to the dryer. 2. Remove dryer side ...
Page 31 - Figure 3: Required Desiccant Amounts; When disposing of drying agents, observe all official rules.
STT40 / STT70 Maintenance 5-9 12. Replace any internal hoses that were removed to change desiccant. Figure 3: Required Desiccant Amounts Dryer 8 x 12 bead Total model Part no. lbs. Kg STT 40 13.23 6 STT 70 W00018051 28.76 13 5.4. Disposing of Drying Agents Please note that drying cells are replaced ...
Page 32 - before; you replace heater; Procedures; Process Heater
STT40 / STT70 Maintenance 5-10 5.5. Replacing the Process Heater The dehumidifying dryers utilize a thru-phase Calrod-type heater element. This heater element ismounted to the inlet of the drying hopper. Although the replacement procedure is the same foreach heater, the wattage varies by model, volt...
Page 33 - you replace cooling coil!; Remove cooler from the cooler housing.
STT40 / STT70 Maintenance 5-11 7. Re-clamp process heater assembly onto the drying hopper. 8. Reattach wiring according to the sketch that was made previously. 9. Replace the air hose to the process heater. 10. Replace access cover on junction box of process heater assembly. 5.5.1. Replacing/Cleanin...
Page 34 - you replace heating; Heating Coil
STT40 / STT70 Maintenance 5-12 5.5.2. Replacing the regeneration heating coil • Hazardous electrical current present.Disconnect and lock out power before you replace heating element! Figure 6: Heating Coil Location and Disassembly 1. In order to gain access to the heating element, the cover plate on...
Page 35 - Remove any granules remaining on the ground.
STT40 / STT70 Maintenance 5-13 5.6. Cleaning the Drying Hopper Set the “Timer” release switch to the position. / Wait until the blower has stopped.The blower will continue running for 10 minutes once the dryer isturned off. If there is a return air cooler installed, switch off the coolant circuit. /...
Page 36 - When cleaning, remove any granules remaining in the hopper lid.
STT40 / STT70 Maintenance 5-14 STT 25 Open the toggle-type fasteners (A) at the hopper lidand fold the hopper lid upwards (if in use: removebefore the single conveyor).Clean the drying hopper.Close the hopper lid and close the toggle-typefasteners (A) (if in use: re-mount the singleconveyor). ) When...
Page 37 - Functional description 6-15; Functional description; Verify that the operators have the appropriate skills.
STT40 / STT70 Functional description 6-15 6. Functional description This functional description is addressed to the operators of theequipment. This functional description assumes the operator has a generalfamiliarity with drying equipment. Verify that the operators have the appropriate skills.
Page 38 - Functional description 6-16; The dryer is rated for continuous operation.
STT40 / STT70 Functional description 6-16 6.1. General Information The dehumidified air dryers were developed for drying plastic granules. Due to their compactconstruction, they can be utilized for drying next to the processing machine (drying hopper on theprocessing machine) or with one or more dry...
Page 39 - Functional description 6-17; Figure 9: Functional diagram of STT40 / STT70
STT40 / STT70 Functional description 6-17 ➀ ➁ ➀ ➈ ➇ ➂ ➃ ➃ ➄ ➅ ➆ Figure 9: Functional diagram of STT40 / STT70 All functions are fully automatic. The dryer is equipped with two drying cells. One drying cell is part of the drying cycle; the otherdrying cell is regenerated simultaneously. Part of the d...
Page 40 - Functional description 6-18; Figure 10: Operating unit
STT40 / STT70 Functional description 6-18 1 = “hopper” release switch STT1, STT2 (STT2 only STT70)2 = dew point display (op tional)3 = “power” signal lamp4 = “trouble” signal lamp5 = main power switch6 = “Timer” release switch7 = timer clock (op tional)8 = temperature controller “drying hopper” STT1...
Page 41 - Functional description 6-19; Figure 11: Drying Hopper
STT40 / STT70 Functional description 6-19 6.2. Drying Hopper (Optional) The material is dried in the drying hopper. Thedehumidified air is heated and then conductedthrough the material in the drying hopper andremoves moisture. Drying hoppers must have theappropriate dimensions for their specific use...
Page 42 - Functional description 6-20
STT40 / STT70 Functional description 6-20 6.2.1. Hopper Heater Each drying hopper has its own heater. The temperature of the dehumidified air is adjusted bymeans of the temperature controller. The setting range is from +140°- +356°F (+60 - +180 °C).The current temperature can be read off the digital...
Page 43 - Functional description 6-21; DEFAULT SETTINGS FOR JUMO TEMP. CONTROLLER
STT40 / STT70 Functional description 6-21 DEFAULT SETTINGS FOR JUMO TEMP. CONTROLLER Model number: dTRON 16.1 B 70.3011 Contact information: Germany USA MoltkestraBe 13-31 885 Fox Chase, Suite 103 36035 Fulda, Germany Coatesville, PA 19320, USA Ph: +49 661 60 03-7 27 Ph: 610-380-8002 or 1-800-554-JU...
Page 44 - Functional description 6-22; Figure 13: Suction Box
STT40 / STT70 Functional description 6-22 6.3. Connection to a Pneumatic Conveying System (Optional) Your dryer works best in combination with apneumatic conveying system. Whenassembled this way, your drying hopper willalways be supplied with sufficient material.The dryer will only take as much mate...
Page 45 - Ensure that the operating personnel are sufficiently informed.
STT40 / STT70 Transporting, Assembly and Storage 7-1 7. Transporting, Assembly and Storage This chapter is intended for all operating personnel of theequipment. Personnel using these instructions must be knowledgable in theregulations for the prevention of accidents, the operatingconditions, safety ...
Page 46 - The machine must not be tilted or laid on its side.
STT40 / STT70 Transporting, Assembly and Storage 7-2 7.1. Transporting and Packing Please ensure that the lifting equipment has an adequate carryingcapacity.Note that the dryer system is top-heavy. Risk of toppling! ) The machine must not be tilted or laid on its side. The equipment has undergone a ...
Page 48 - Assembly instructions 8-1; Assembly instructions; Ensure in each case that the personnel are informed.
STT40 / STT70 Assembly instructions 8-1 8. Assembly instructions These installation instructions are intended for persons withskills in electrical and mechanical areas due to their training,experience and supporting documentation. Personnel using these installation instructions must beknowledgeable ...
Page 49 - Assembly instructions 8-2; Grounding the equipment against electrostatic charging; Figure 14: Grounding the equipment
STT40 / STT70 Assembly instructions 8-2 8.1. Installation of the exhaust fan for regeneration of exhaustair When plastics are being dried that release harmful gases during the drying process, care must betaken that the regeneration exhaust air is disposed of in an environmentally sound way. At thesa...
Page 50 - Assembly instructions 8-3; Observe the rules of the state and local electricity board.
STT40 / STT70 Assembly instructions 8-3 8.3. Electrical Connection The electrical connection of the dryer and the hopper heaters mayonly be done by Sterling service staff or by qualified staffauthorized by Sterling. Other persons are not permitted to perform any electricalconnection. Observe the rul...
Page 51 - Assembly instructions 8-4
STT40 / STT70 Assembly instructions 8-4 8.4. Connection of Return Air Cooler (Optional) ) A return air cooler must be used if the return air temperature ishigher than 149°F (+65 °C). You can connect the return air cooler to a coolant circuit or to the water main network.The water flow rate in the wa...
Page 52 - Clean or replace filter.
STT40 / STT70 Troubleshooting 9-1 9. Troubleshooting 9.1. Introduction The utmost in safety precautions should be observed at all times when working on oraround the machine and the electrical components. All normal trouble-shooting mustbe accomplished with the power off, line fuses removed, and with...
Page 55 - Determining Temperature Controller Errors or Sensor Errors
STT40 / STT70 Troubleshooting 9-4 Problem Possible cause Corrective action No setting change possible ontemperature controller. The key protection switch is setto ON . Set the key protection switch to OFF . Input polarity on thermo-coupleis wrong or connection is wrong. Properly wire the terminals. ...
Page 56 - data
STT40 / STT70 Technical data 10-5 10. Technical data 10.1. STT40 amount of dehumidified air: max. 1,412.69 ft3/h, (40 m3/h) operating voltage: 230 V/AC/50 Hz special voltages can be supplied upon requestconnected load: 2.6 kWcalorific output (drying) * : max. 1.5 kW *depending on the equipment with ...
Page 58 - Spare parts list 11-1; Spare parts list; This spare parts list must be used only by trained personnel.
STT40 / STT70 Spare parts list 11-1 11. Spare parts list This spare parts list must be used only by trained personnel. Other persons are not permitted to modify or repair theequipment.
Page 59 - Spare parts list 11-2; Description
STT40 / STT70 Spare parts list 11-2 STT40 Pos. ID-number Description 1 valve stem 31940 shaft 31938 housing 36212 disc with bush 84130 disc flywheel DU 2 83957 filter cartridge, when operating withoutreturn air cooler 83956 filter cartridge, when operating withreturn air cooler 3 84129 blower STT40 ...
Page 60 - Spare parts list 11-3
STT40 / STT70 Spare parts list 11-3 STT70 Pos. ID-number Description 1 valve stem 31940 shaft 31938 housing 36212 disc with bush 84130 disc flywheel DU 2 83957 filter cartridge, when operating withoutreturn air cooler 83956 filter cartridge, when operating withreturn air cooler 3 85677 blower STT70 ...
Page 61 - Spare parts list 11-4; Operating unit
STT40 / STT70 Spare parts list 11-4 Operating unit Pos. ID-number Description 1 82368 main switch 2 82394 LED element, green 82393 cap 82495 fixing adapter 3 82494 LED element, white 82392 cap 82495 fixing adapter 4 26207 dew point display (optional) 5 82395 selector switch actuator 82490 contact el...
Page 62 - Spare parts list 11-5; Control unit STT40
STT40 / STT70 Spare parts list 11-5 Control unit STT40 85280 motor84131 radiator 0.7 kW83339 pull-button87440 contact element83411 controller82516 temperature limiter88440 contactor85941 terminal85940 fuse99102 fuse88806 relay holder88816 relay84510 thermal breaker Hopper heater 85688 radiator 1,5 k...
Page 63 - Electrical manual 12-1; manual
STT40 / STT70 Electrical manual 12-1 12. Electrical manual This electrical manual is intended to be used by Sterling servicepersonnel and trained personnel authorized by Sterling only. Other persons are not permitted to modify or repair theequipment. Connection diagram no.: _ _ _ _ _ _ _ _ _ _ _ _...
Page 67 - Quick Start Guides; Main power High Temp Safety Main Power Connection
14. Quick Start Guides 14.1. for STT 40 Dryer 1. Check all wiring connections to ensure that they are in the correct place and have a goodtight connection. 2. Hook up main single-phase power and ground. The following picture shows the correctlocation. Main power High Temp Safety Main Power Connectio...
Page 68 - Position “O”
4. Turn the dryer operation switch to the desired position. If you have a seven day timerinstalled, set it to “On with timer” position, otherwise set it to “On without timer” position. Theblower will start. An explanation is given in the following diagram. 5. Turn the hopper heater switch to positio...
Page 70 - DO NOT; TURN MAIN POWER DISCONNECT TO; OFF; POSITION WITHOUT FIRST TURNING; OFF “0”
It is recommended that the dryer be Self-Optimized. The following steps should be taken to selfoptimize the dryer: a.) Press and hold the “EXIT” button for at least 2 seconds. b.) “tunE” will flash while self-optimization is in progress (can take several minutes) c.) When “tunE” stops flashing; self...
Page 71 - DISCONNECT POWER BEFORE
14.2. Proper Shut-down Guide for STT 40 Dryer 1. Turn the hopper heater switch to position “0” Position “O” Position “I” 2. With the main disconnect power in the “ON” position, turn the dryer operation switch to the “OFF” position, this will automatically enable the system to go into cool downmode. ...
Page 72 - On with timer
14.3. Quick Start Guide for STT 70 Dryer 1. Check all wiring connections to ensure that they are in the correct place and have a good tight connection. 2. Hook up main three-phase power and ground. The following picture shows the correct location. Main power High Temp Safety Main Power Connection He...
Page 73 - EXIT
5. Turn the hopper heater switch to position “I” Position “O” Position “I” 6. Once in position “I”, the temperature controller will display as shown below. Blower must be running for temperature controller to be on. Temperature setting will vary as the processeddesired temperature is changed. Also, ...
Page 74 - DO NOT TURN MAIN POWER DISCONNECT TO
Note: Due to the following circumstances: - initial dryer start-up- dryer not running for long period of time- dryer has been unplugged and moved to a different location It is recommended that the dryer be Self-Optimized. The following steps should be taken to selfoptimize the dryer: a.) Press and h...
Page 75 - DISCONNECT POWER BEFORE SERVICING
14.4. Proper Shut-down Guide for STT 40 Dryer 1. Turn the hopper heater switch to position “0” Position “O” Position “I” 2. With the main disconnect power in the “ON” position, turn the dryer operation switch to the “OFF” position, this will automatically enable the system to go into cool down mode....
