Home

Sterling STT40 Dehumidifier User Manual

1. Code C111 C112 C113 C114 SPL SPH OO ON NO Oo OO W W O AA Oo with return air cooler in use 0356 Parameter Parameter set 1 AL1 68 0 HYS1 1 rASd 19 0 Settings if temperature is displayed in C Code C111 C112 C113 C114 SPL OO OINO OO Oo RO wOoOo SPH Oo OoIo With return air cooler in use 0 180 Parameter Parameter set 1 AL1 20 0 HYS1 1 rASd 5 0 Accessories 13 2 STT40 STT70 Basic temperature controller settings STT70 This information is intended to be used by Sterling service personnel and trained personnel authorized by Sterling only Other persons are not permitted to modify or repair the equipment Settings if temperature is displayed in F Code C111 0 0 0 0 C112 2 0 3 0 C113 0 5 3 4 C114 1 0 0 1 SPL 0 1 0 4 SPH 0 2 8 4 With return air cooler in use 0 3 5 6 Parameter Parameter set 1 AL1 68 0 HYS1 1 rASd 19 0 Settings if temperature is displayed in C Code C111 0 0 0 0 C112 2 0 0 0 C113 0 5 3 4 C114 1 0 0 1 SPL 0 0 4 0 SPH 0 1 4 0
2. With return air cooler in use 0 180 Parameter Parameter set 1 AL1 20 0 HYS1 1 rASd 5 0 Accessories 13 3 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 good tight connection 2 Hook up main single phase power and ground The following picture shows the correct location Main power High Temp Safety Main Power Connection Heater Connection Thermocouple 3 Turn the disconnect switch to the ON position as shown The green run light should light up fe p 4 Turn the dryer operation switch to the desired position If you have a seven day timer installed set it to On with timer position otherwise set it to On without timer position The blower will start An explanation is given in the following diagram On without timer ay 5 Turn the hopper heater switch to position Position O Position I 6 Once in position l temperature controller will display as shown below Blower must be running for temperature controller to be on Temperature setting will vary as the processed desired temperature is changed Also a description of the buttons are listed below Note For initial start up or if the dryer has not run for an extended period of time turn the hopper heater switch to position O Wait 2 hours for bot
3. The dehumidifying dryers utilize a thru phase Calrod type heater element This heater element is mounted to the inlet of the drying hopper Although the replacement procedure is the same for each heater the wattage varies by model voltage temperature range etc Hazardous electrical current present Disconnect and lock out power before you replace heater elements Figure 4 Process Heater Location and Disassembly Remove Clamp Process Heater Procedures 1 Remove access cover from the junction box located on the bottom of the heater 2 Remove the wiring from all terminals that are inside the junction box Note Sketch all wiring locations so that you can properly re install later 3 Remove the clamp that is attaches the process heater to the hopper Also remove the hose from the heater 4 Place the process heater assembly on a workbench to begin disassembly 5 Carefully unscrew heater junction box subassembly from the process heater housing You must replace both the process heater element and the junction box 6 Replace with new heater element junction box subassembly Heater loops should not touch each other Hot spots lead to premature heater failure Maintenance 5 10 STT40 STT70 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
4. Call 414 354 0970 Monday Friday 8am 5pm CST Sterling products are sold by a world wide network of independent sales representatives Contact our Sales Department for the name of the sales representative nearest you MATERIAL D g PROCESSING Contract Department Call 414 354 0970 Monday Friday 8am 5pm CST Let Sterling install your system The Contract Department offers any or all of these services project planning system packages including drawings equipment labor and construction materials and union or non union installations Sterling 2 Sterling 5200 W Clinton Ave an aw Milwaukee WI 53223 414 354 0970 Fax 414 354 6421
5. Regeneration heater 2 The safety temperature limiter on regeneration heater 2 has been activated Check the safety temperature limiter Call the Sterling Service Department Hopper heater The safety temperature limiter on the hopper heater has been activated Check the safety temperature limiter Call the Sterling Service Department STT40 STT70 Error and error correction 4 2 STT40 STT70 5 Maintenance This chapter is intended for persons having skills in electrical and mechanical areas due to their training experience and supporting documentation Personnel using the instructions in this chapter must be familiar with accident prevention regulations operating conditions safety regulations and their implementation Ensure in each case that the personnel are informed For maintenance work taking place at heights of over 6ft 1829mm use only ladders and working platforms or similar equipment intended for this purpose At greater heights the proper protective equipment against falling must be worn Use only suitable lifting gear in proper working order and load suspension devices within the sufficient carrying capacity Do not stand or work under suspended loads Ensure that electric motors and controller cabinets are sufficiently protected against moisture Use suitable workshop equipment Before starting maintenance work appoint a supervisor Before beginning maintenance work on the system inform the
6. Please ensure that the lifting equipment has an adequate carrying capacity 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 rigorous operating test in the factory and is packed carefully to avoid transport damage Please check packing materials upon delivery for transport damage The inlet and discharge flanges are sealed with plugs so that no dirt can enter during transport Remove the plugs before assembly Packing materials should be disposed of according to environmental laws or reused The dryer or the compact unit is delivered on a pallet The dryer should only be moved by means of the appropriate lifting equipment e g a fork lift truck or a workshop crane Fasten the transport cables to the eyelets of the control cabinets When transporting the dryer to another location it must be shock proofed and free from vibrations Transporting Assembly and Storage 7 2 STT40 STT70 7 2 Assembly Please ensure the lifting equipment has an adequate carrying capacity Check the load capacity where the dryer is to be installed particularly if it is to be installed on a platform The place selected for installation should be as vibration free as possible The main power switch must be accessible Ground the equipment against electrostatic charging The machine must not be tilted or laid on its side Because of its compact
7. 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 PGM Set the drying temperature to 176 F using the arrow keys After 2 seconds the display will flash and the value will be stored Vv Press the EXIT key the setpoint value and the actual value EXIT of the drying temperature are displayed After 2 hours turn the Hopper release switches ST1 ST2 to the 0 position Turn the Timer switch to the OFF position Wait until the blower has stopped The blower will continue running for 10 minutes once it is turned off If there is a return air cooler installed turn off the coolant circuit Turn off the dryers main power switch aa The power signal lamp turns off Note The previous steps only need to be taken if this is the initial Startup of the dryer or if the dryer has been sitting for several months Start up 3 3 STT40 STT70 3 2 Continuous Operation Note To see a quick start guide for operation of this dryer see chapter 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 RA The run signal lamp turns on For operation with the optional timer clock Turn the Timer switch to the position For operation without timer clock Turn the Timer switch to the posi
8. oil observe all BS official rules Caution High noise pollution For anyone working on the equipment hearing protection should be worn Avoid impairment of hearing Caution Danger of being crushed Disconnect the equipment from the main power supply before starting maintenance procedures All compressed air pipes on the equipment should be depressurized before starting maintenance work Caution Danger surface is hot Before starting any work wait until all parts have cooled down sufficiently Avoid touching any of these parts A Caution Danger surface is slippery Remove any granules remaining on the ground Caution Danger electrical shock hazard Observe that the control system is still under voltage even when the main power switch is switched off General Information 1 2 STT40 STT70 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 explanations listed below Equipment Equipment can mean an individual unit a machine or an installation Operating personnel The operating personnel are persons operating the equipment under their own responsibility or according to instructions Operator The operator of the equipment production manager foreman etc is the person responsible for all production sequences The operator instructs
9. 49 661 60 03 7 27 Ph 610 380 8002 or 1 800 554 JUMO Fax 49 661 60 03 5 08 Fax 610 380 8009 E mail mail jumo net Email info JumoUSA com Internet www jumo net Internet www JumoUSA com PARAMETERS THAT ARE CHANGED IN TESTING AREA FACTORYDEF ACS VALUE ACSVALUE DESCRIPTION _ _ _ 140 Deg C 284 Deg F HIGH TEMP LIMIT STANDARD a1 o 20Deg C 68 Deg F HIGH TEMP ALARM BAND rasa o 5 19 RAMP GRADIENT PARAMETERS THAT ARE NOT CHANGED FACTORY DEFAULTS sch O f O JSTART VALUE RANGE FOR STD SIGNALS AL2 O f O LIMIT FOR LIMIT COMPARATOR Pht 0 f 7 PROPORTIONAL BAND T CONTROLLER OUT 1 Pb2 O f PROPORTIONAL BAND 2 CONTROLLER OUT 2 db 0 CONTACT SPACING _ _ _ _ _ _ _ _ __ _ _ __ _ __ _ _ _ S a 100 100 0 9 RAM RENE Note 1 Please consult the JUMO dTRON temperature controller O amp manual for further explanation of the above parameter settings 2 Some factory default settings may change as the unit is run continuously Functional description 6 21 STT40 STT70 6 3 Connection to a Pneumatic Conveying System Optional Your dryer works best in combination with a pneumatic conveying system When assembled this way your drying hopper will always be supplied with sufficient material The dryer will only take as much material as is required by the processing machines Therefore the drying result will remain consistent
10. Sterling drying hoppers are equipped with a suitable flange for adding a Sterling pneumatic conveyor Suction boxes with one or three suction tubes can be supplied as well optional These suction boxes are developed specifically for this type of hopper The loading of material into the conveying line is adjusted by closing or opening the control cover A Figure 13 Suction Box 6 4 Return Air Cooler Optional A RETURN AIR COOLER MUST BE EMPLOYED IF THE RETURN AIR TEMPERATURE IS HIGHER THAN 65 C 149 F A return air cooler improves the efficiency of the drying cells LH The lower the return air temperature the better the efficiency of the drying cells The return air cooler can be connected to a coolant circuit or to the water main network Functional description 6 22 STT40 STT70 7 Transporting Assembly and Storage This chapter is intended for all operating personnel of the equipment Personnel using these instructions must be knowledgable in the regulations for the prevention of accidents the operating conditions safety regulations and their implementation Ensure that the operating personnel are sufficiently informed Please inform all persons around the operating equipment of the direct and indirect hazards connected with it Please observe all safety regulations for the operation of lifting equipment Transporting Assembly and Storage 7 1 STT40 STT70 7 1 Transporting and Packing
11. box of process heater assembly 5 5 1 Replacing Cleaning the Cooling Coils Hazardous electrical current present Disconnect and lock out power before you replace cooling coil Figure 5 Cooling Coil Location and Disassembly Cooling Coil Location 1 In order to gain access to the cooling coil the cover plate on the side of the dryer must be removed Remove cooler from the cooler housing To clean the cooling coil use compressed air or a steam cleaner to blow the dust off or clean any oily residue on the coil 4 Re install the cooler in reverse order Install new gaskets and securely tighten all fasteners 5 Secure the access cover on the side of the dryer Maintenance 5 11 STT40 STT70 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 Heating Coil O Oe oD In order to gain access to the heating element the cover plate on the side of the dryer must be removed Remove the desiccant tank which has the faulty heater element from the dryer Place desiccant tank onto a workbench and remove desiccant as stated earlier in the changing desiccant section of this manual If the desiccant is old or damaged you may discard it at this time If it is undamaged place it in a bag and save it for later Unwire the heater that is located inside the bottom of
12. carefully remove all desiccant from each tower Remove Hose Clamps Remove Clamp Inspect each lower desiccant screen for tears or holes where desiccant burned through Replace as needed After cleaning each chamber add a level layer of half the 8 x 12 bead desiccant on top of the screen Next carefully add the full amount of bead desiccant specified per bed Smooth the top level and finally add another layer of the remaining bead desiccant to the top Make sure this layer is level and smooth See following table for correct amount of desiccant required Repeat the previous step for the other bed 10 Inspect the gaskets on the valve assembly Replace if necessary 11 Place the desiccant cell assembly back into the dryer and replace clamps Maintenance 5 8 STT40 STT70 12 Replace any internal hoses that were removed to change desiccant Figure 3 Required Desiccant Amounts Dryer 8 x 12 bead Total model Partno Ibs Kg STT 40 13 23 6 5 4 Disposing of Drying Agents Please note that drying cells are replaced or refilled by Sterling only if they are empty When disposing of drying agents observe all official rules Since used drying agents may contain impurities from the dried materials treat them as special waste BLE It is not possible for Sterling to take back the used drying agent or drying cells with used drying agents Maintenance 5 9 STT40 STT70 5 5 Replacing the Process Heater
13. construction the dryer can be installed directly beside the processing machine drying hopper on the processing machine or with one or more drying hoppers as a movable facility compact facility Special foundations are not necessary for installation The dryer must be installed on a level surface and must not be exposed to excessive humidity The maximum permissible ambient temperature is 45 C 113 F To facilitate servicing the dryer should be installed in such a way that it is accessible from 3 sides Make sure that the air filters can be changed without problems To conserve energy keep the distance between dryer hopper and processing machine as small as possible The wheels of the compact unit should be locked to ensure stable operation The foil skin should be removed from the drying hopper before operation 7 3 Storage The control system may only be stored at temperatures from 0 to 55 C 32 to 131 F Between delivery and machine commissioning the equipment should be stored in a dry dust and vibration free room Transporting Assembly and Storage 7 3 STT40 STT70 8 Assembly instructions These installation instructions are intended for persons with skills in electrical and mechanical areas due to their training experience and supporting documentation Personnel using these installation instructions must be knowledgeable in the regulations for the prevention of accidents operating conditions safety
14. contactor is Blower Input indicator is off oi Check input wiring to PLC Left Right t indicators both pa i en Mn Insufficient power to PLC Check power supply and power f Power light is off wiring to PLC Faulty PLC PLC Power light is on Run light is off and or Error Replace PLC light is on Loss or reduction of process air temperature Material being dried differs from material specified at the time of purchase Loss or reduction in drying capacity Airflow valve sticking or failing to shift Blower fins filled with dust or contaminants Troubleshooting 9 2 STT40 STT70 Problem Possible cause Corrective action Check resin manufacturer s data sheet for proper drying Process temperature set too high temperature Make sure plant due to operator error personnel are aware of the correct process temperature set point High temperature alarm not set ba Reset high temperature alarm Material in drying hopper cakes properly or meltdown occurs Process set point is out of Restore temperature controller acceptable range to factory pre sets Function set for degrees Celsius C set point at degrees Fahrenheit F Verify correct Celsius or Fahrenheit settings Verify that the thermocouple is properly installed in the inlet tube Burned out regeneration heater Repair or replace Contaminated or worn out desiccant Leaking process air hoses Repair or replace Boo
15. flows through the drying hopper In this manner plastic granules can be dried down to a very small residual moisture content The drying temperature can be adjusted if necessary up to a maximum of 356 F 180 C upper limit When drying above 250 F process temperature a return air cooler is required Due to the heat that is released during water absorption in the drying cells the lower limit of the dehumidified air temperature is approx 140 F 60 C Drying takes place continuously i e there are no rest periods due to regeneration of the drying agent The dryer is rated for continuous operation The dryer may only be put into operation if the drying hopper is filled Functional description 6 16 STT40 STT70 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 other drying cell is regenerated simultaneously Part of the dehumidified air is used for regenerating the moist drying cell At the beginning of regeneration it is heated by the regeneration heater After the end of the heating period the drying cell is cooled off by using dehumidified air After the switch over time is reached the regenerated drying cell is included in the drying cycle and the cycle starts again 3 Drying hopper H 4 Diaphragm OL 5 Return air filter i i 6 Blower X Le x 9 Suct
16. into cool down mode That means the blower will run for 10 minutes Note This time is utilized to cool down the regeneration heater cell 3 After 10 minutes of run time the blower will turn off but the green light remains lit That means the system is off but the power is still on 4 Turn the disconnect switch to the OFF position as shown The green run light should turn off CAUTION DISCONNECT POWER BEFORE SERVICING DRYER UNIT MATERIAL D PROCESSING Parts Department Call toll free 7am 5pm CST 800 423 3183 or call 414 354 0970 Fax 414 354 6421 The ACS Customer Service Group will provide your company with genuine OEM quality parts manufactured to Sterling engineering design specifications which will maximize your equipment s performance and efficiency To assist in expediting your phone or fax order please have the model and serial number of your unit when you contact us A customer replacement parts list is included in this manual for your convenience ACS welcomes inquiries on all your Sterling parts needs and is dedicated to providing excellent customer service MATERIAL Service Department Call toll free 8am 5pm CST 800 657 4679 or call 414 354 0970 Emergencies after 5pm CST call 847 439 5655 Sterling has a qualified service department ready to help Service contracts are available for most Sterling products D PROCESSING MATERIAL PROCESSING Sales Department
17. regulations and their implementation Ensure in each case that the personnel are informed The installation and operation instructions apply to all connected equipment Observe safety regulations with regard to handling lifting gear All installation work must be carried out with the equipment disconnected from electrical power and compressed air supply For installation work taking place at heights of over approx 6 feet 1829mm use only ladders or similar equipment and working platforms intended for this purpose At greater heights the proper equipment for protection against falling must be worn Use only suitable lifting gear which is in proper working order and suspension devices within the sufficient load carrying capacity Do not stand or work under suspended loads Use suitable workshop equipment Install the equipment such that all parts are easily accessible this facilitates maintenance and repair work Assembly instructions 8 1 STT40 STT70 8 1 Installation of the exhaust fan for regeneration of exhaust air When plastics are being dried that release harmful gases during the drying process care must be taken that the regeneration exhaust air is disposed of in an environmentally sound way At the same time the throughput of the regeneration blower must not be altered It should be noted when assembling a disposal system e g an exhaust system that the regeneration exhaust air is very humid Thus condensati
18. relay holder 88816 relay 84510 thermal breaker Hopper heater 85688 radiator 1 5 kW 85652 safety temperature limiter Control unit STT70 85279 motor 85676 radiator 1 2 kW 95816 pull button 87440 contact element 83329 controller 85275 temperature limiter 88914 contactor 85254 power supply 88907 terminal 99815 fuse 88806 relay holder 88849 relay 83624 terminal 84512 thermal breaker 84159 control switch Hopper heater 85343 radiator 1 5 kW 84512 thermal breaker 85652 safety temperature limiter STB 85338 radiator 3 kW 84510 thermal breaker 85652 STB STT40 STT70 Spare parts list 11 5 STT40 STT70 12 Electrical manual This electrical manual is intended to be used by Sterling service personnel and trained personnel authorized by Sterling only Other persons are not permitted to modify or repair the equipment O Connection diagram no O Currently not available will be delivered at a later date Electrical manual 12 1 STT40 STT70 13 Accessories O Basic setting on temperature controller O Digital timer O Spare parts list Drying Hoppers ST 25 ST 6400 o m Accessories 13 1 Basic temperature controller settings STT40 STT40 STT70 This information is intended to be used by Sterling service personnel and trained personnel authorized by Sterling only Other persons are not permitted to modify or repair the equipment Settings if temperature is displayed in F
19. responsible personnel Never operate the equipment when it is partially dismantled Any maintenance and repair work NOT described in this manual may only be carried out by Sterling service personnel or by specialized staff authorized by Sterling B To ensure that it cannot be switched on unintentionally disconnect the equipment from the main power supply before starting maintenance procedures Before starting maintenance work all compressed air pipes on the equipment should be depressurized Maintenance 5 1 STT40 STT70 Please observe the maintenance schedule Before starting maintenance work clean the equipment of oil fuel or lubricant Ensure that materials and incidentals as well as spare parts required for operation are disposed of properly and in an environmentally sound manner Use only original Sterling spare parts Keep records of all maintenance and repair procedures Maintenance 5 2 STT40 STT70 5 1 Maintenance schedule The checklist below contains a list of items which should be inspected and or replaced to keep your Dehumidifying Dryer operating at peak efficiency Perform each inspection at the regular intervals listed below System model Inspect all filters for lace clean if dirty or ee Cel one ee ee Ce Go Ge worn a aa rs TF ee ee Check to make sure that all hose conections are air tight Every Jan Apr May Jun Jul Aug Nov month Lock out electrical electrical wir
20. the drying hoppers are always completely filled and that the retention period is respected if material is continually being removed Note that if too much material is taken from the drying hopper it will lead to insufficient drying of the material Close the air stop valves of the drying hoppers which are empty or have not been used Write down all data which you have entered into the control system The password is to be given to authorized personnel only Please note that the temperature of the dryer heating system must always be set lower than that of the supplementary heaters When you dispose of drying agents observe all official rules and guidelines Note that drying cells should be replaced or refilled only by Sterling if they are empty When no material is continuously fed into the drying hopper batch drying and is continuously removed the material level must not fall below 40 in the drying hopper Close the throttle valves Read the operating manuals of any machines connected to this dryer Safety instructions 2 5 STT40 STT70 3 Start up This chapter is addressed to the operators of the machine It assumes the operator has general skills with drying equipment and that the functional description has been read and understood Ensure that the operators have the required experience Make sure that the main switch is set to the 0 position Check the drying hopper for cleanliness Check to see whether the ad
21. 00 mm depth 35 5 in height 35 5 in weight approx noise approx options timer c 900 mm 900 mm 227 17 lbs 103 kg 66 dB A lock dew point display return air cooler Return Air Cooler optional water flow rate in the water mains network approx 14 13ft 3 h 0 4 mS h water temperature 42 8 F 6 C pipe connection 0 5 in 12 mm Technical data 10 5 10 3 Dimension Sheet RO B STT40 STT70 vvvvvyvyvvvvvvvyl STT 40 STT 70 A 27 5 700 mm 35 5 900 mm B 3 2 80 mm 3 2 80 mm C 35 5 900 mm 35 5 900 mm D 11 8 300 mm 15 7 400 mm Dimensions in inches mm Specifications may be subject to change without notice Technical data 10 6 STT40 STT70 11 Spare parts list This spare parts list must be used only by trained personnel Other persons are not permitted to modify or repair the equipment Spare parts list 11 1 STT40 Pos ID number 31940 31938 36212 84130 2 83957 83956 84129 85819 85820 94233 93298 85690 85691 96196 96353 92361 N OO O1 B STT40 STT70 Description valve stem shaft housing disc with bush disc flywheel DU filter cartridge when operating without return air cooler filter cartridge when operating with return air cooler blower STT40 guide roll with fixing device guide roll seal hose clamp seal t
22. 2 Operation Appoint a foreman to be responsible for the equipment Ensure that the operating personnel are provided detailed instruction in the operation of the equipment Improper operation results in danger of accidents When the main power switch is turned off for reasons pertaining to safety it must be secured against unauthorized activation Caution Danger of accidents Repair work must be carried out by trained personnel only Caution Danger of accidents Never operate the equipment when partially dismantled Danger Limbs may be caught in machinery Electric shock In case of malfunction shut down the equipment immediately Have malfunctions corrected immediately Danger of accidents This machine is intended only for the drying of granulated plastics Any other use is contrary to specifications This equipment is not suitable for food processing The safety instructions of any connected machines must be followed Please note that sound levels exceeding 85 db A may cause long term damage to your health Use the appropriate ear muffs This avoids impairment of hearing Please note that the drying cells drying hoppers and piping grow hot during use Avoid touching any of these parts Danger Injury through burns Never operate the dryer without side panels Danger Limbs may be caught in machinery Injury through burns When drying plastics which emit gases dangerous to human health take care that the regeneration exh
23. 5 5 2 Replacing the regeneration heating coil 5 12 5 6 Cleaning the Drying HOpper sine es Rent Rav ails 5 13 6 Functional d s ription s statement ali 6 15 6 1 Ge eral Information SSSR na de a 6 16 6 2 Drying Hopper Opnonal s nn nr nt nt nets ne nf 6 19 62 1 Hopper Heaters 4 mandarin tre a a duret es 6 20 6 3 Connection to a Pneumatic Conveying System Optional ceeeeseeeteees 6 22 6 4 Return Air Cooler OO DHEA laste Ghee aes 6 22 7 Transporting Assembly and Storage 7 1 7 1 Transporting and PACKINGS cc1s dsassecadeadueves cdi eesnedl oes TR nd nement 7 2 PD ASSOMDI ES res NA ln es Aa aio hind Aw RR Aa eed a 7 3 TB TS HO FASS en esse ea 7 3 So Assembly MSC HONTE MER ARR NN ete Re nn 8 1 8 1 Installation of the exhaust fan for regeneration of exhaust air 8 2 STT40 STT70 8 2 Grounding the equipment against electrostatic charging 8 2 8 3 Electical Connection tsc h cc Aviieti in A seal cr iah 8 3 8 4 Connection of Return Air Cooler Optional R 8 4 Oe CFOUDI S AGO INR SR tn een 9 1 9 1 BA DOTE LD TE HEAR yee eau st nc tiha aul ba ache hte dasa cae Nad Gna cael eas 9 1 9 2 Determining Temperature Controller Errors or Sensor Errors 9 4 Using a Th rMoCouple racine nce tet vag cats ee hd Dennis 9 4 Using a Platinum Resistance Th rmomeler ainsi an t
24. All normal trouble shooting must be accomplished with the power off line fuses removed and with the machine tagged as out of service The use of good quality test equipment cannot be over emphasized when troubleshooting is indicated Use a good ammeter that can measure at least twice the AC and DC current that can be encountered for the machine Be sure that the voltmeter has at least minimum impedance of 5 000 OHMS per volt on AC and 20 000 OHMS per volt on DC scales Popular combination meters VOM and VTVM can be selected to provide the necessary functions Before making haphazard substitutions and repairs when defective electrical components are malfunctioning we recommend that you check the associated circuitry and assemblies for other defective devices It is common to replace the obviously damaged component without actually locating the real cause of the trouble Such hasty substitutions will only destroy the new component Refer to wiring diagrams and schematics Locating mechanical problems should they occur is relatively straightforward When necessary refer to the parts catalog section Clean or replace filter Desiccant beds are contaminated by material or plasticizer leaking Little or no air coming from into the system overload contaminants clean baffles replace Stop the dryer If the dryer was connected to the drying hopper check to see if the desiccant and process air Phase is reversed on power drop heater ha
25. HONS isetis3sctvessiscedassdacty lt iteceeieadecauandulersucedactisba R E TKa an 2 1 2 Mees ASSEM yerani E a nc Ne 2 3 DN Operati om Sn ST RE se et la ne ans 2 3 2 1 3 M intenanGe ns mania annee nat nel ne 2 4 2 2 For the safety of the device ss ccsstsacassicasassasizascnassdstaasadearansd cdg sariadessagestissandetaaseerieaas 2 5 Je Start Uporno nt as tae i aed RR a a a Oe ne nas 3 1 DA ital Opeta ON SSSR ne D ent ENS 3 2 SAT Site Dine on th DEV ne Rte ne nn ru 3 2 3 2 Continous Op ration diner idisanemie tsar 3 4 3 2 1 Switching the Dryer OM nent ent edit 3 4 3 2 2 Setting the Dryimo T Mp rAIT sn sn Re es end 3 5 3 3 Switehing the Dryer OP niia a a 3 7 4 Error and Ctror corrections rss nn Teens 4 1 J INIAITISANOS Rs A TT ns 5 1 Sale Maimtenance schedule nren SR EE de este 5 3 5 2 Preventative Mamtenance is unie muette des 5 4 5 2 1 Servicing Process Air Filters cs ins urine same 5 4 Cleaning or Replacing the Return Air Filter 5 5 5 2 3 Servicing the Dew Point Monitor si dunes nine 5 6 5 3 Corrective Maintenance ic ccs naar en cag ann dedans 5 7 5 3 1 Symptoms of Worn Desiccant nt nee 5 7 5 3 2 Replacing WoOrn DesICCant ses inner one tee gt 5 8 5 4 Disposing of Drying Agents sieiscsicsecetscssivessiedeccvsadessted eadoisrsstecsasdseeyeddeuntedandecse 5 9 5 5 Replace the Process Helene nn ne ns nn de 5 10 5 5 1 Replacing Cleaning the Cooling Coils cccccesceecceeseeereeceeceeeeeeeeeeneees 5 11
26. Sterling Operation Instructions Dehumidified air dryer STT40 STT70 Sterling Material Processing STT40 STT70 Sterling Material Processing 5200 West Clinton Ave Milwaukee WI 53223 Telephone 414 354 0970 Fax 414 354 6421 www sterlco com Technical service Service department Telephone 800 423 3183 Edition 07 03 These operation instructions are for please fill in personally Serial number Year of manufacture Date of Delivery Number of delivery Date commissioned Location Group of machines STT40 STT70 Sterling Material Processing retains all rights to change the information in these operation instructions at any time without notice We assume no liability for any errors from direct or indirect damage resulting in context with these operation instructions Copying translation or publication in any form except for personal use by the purchaser requires approval from Sterling Material Processing All rights reserved STT40 STT70 Table of contents l General Informations roni oa tas Oa cate ccc Re M Ne en re eo 1 1 1 1 Warnings and symbols terres mutant 1 1 1 2 Explanations and information x siscaies dain acs vient tana Sr tn eut 1 3 WB Fee Oa basis surat see otal esa ca alee oe th A A Nua tre tts lace Gin ne 1 3 TA ISO PAR PCat ON RNA seca veue sok AREAS ns tae dost adaceNeesades Watusnev eran 1 3 1 5 NOLES OT ISAS C anne ne et ana en REEE S 1 3 241 Safety INStUC
27. aust air is disposed of without polluting the environment This will prevent danger to people and material Safety instructions 2 3 STT40 STT70 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 procedures to ensure that it cannot be switched on unintentionally Caution Danger of accidents All pipes hoses and connections should be checked regularly for leaks and damage Any faults which arise should be corrected immediately Danger of accidents Depressurize all compressed air piping before starting maintenance work Danger of accidents Air filters should only be cleaned replaced when the the main power switch is off and the blower has stopped This avoids injury and damage to equipment Any maintenance work on the equipment should only be started when the main power switch is off and the blower has stopped This avoids injury and damage to equipment Check the v belts of the blower only when the main power switch is turned off and the blowers have stopped Caution Danger of accidents Open drying hoppers only if they are completely empty Danger of accidents Never open drying hoppers while the device is in operation Danger Injury through burns Open drying hoppers only if they have been sufficiently cooled down Dan
28. e fasteners A if in use re mount the single conveyor Figure 7 STT 25 When cleaning remove any granules remaining in the hopper lid STT 60 100 Open the door of the drying hopper Lift and turn the handle A to open the lock if Se ae t in use remove before the ot y 1 LA fas single conveyor Y HS a H Clean the drying hopper ra Y i pt ewe Close the door of the drying ES me hopper Turn the handle A A H until the door is locked and K Ep then close the handle if in N use re mount the single i conveyor aX Figure 8 STT 60 STT 100 When cleaning remove any granules remaining in the hopper door Maintenance 5 14 STT40 STT70 6 Functional description This functional description is addressed to the operators of the equipment This functional description assumes the operator has a general familiarity with drying equipment Verify that the operators have the appropriate skills Functional description 6 15 STT40 STT70 6 1 General Information The dehumidified air dryers were developed for drying plastic granules Due to their compact construction they can be utilized for drying next to the processing machine drying hopper on the processing machine or with one or more drying hoppers as a movable facility compact facility The dryers work according to the dehumidified air principle i e the air is not only heated but also dehumidified before it
29. ension ring desiccant 6 kg 13 23 Ibs seal tension ring Return air cooler optional 33848 83972 return air cooler hose Spare parts list 11 2 STT70 Q3 Pos ID number 31940 31938 36212 84130 2 83957 83956 85677 85819 85820 94233 97677 23917 97677 23533 8 96196 9 96353 92361 O O1 BR N STT40 STT70 Description valve stem shaft housing disc with bush disc flywheel DU filter cartridge when operating without return air cooler filter cartridge when operating with return air cooler blower STT70 guide roll with fixing device guide roll sealing ring tension ring sealing ring tension ring sieve desiccant 13 kg 28 76 Ibs seal tension ring Return air cooler optional 29786 83972 return air cooler hose Spare parts list 11 3 Operating unit Pos STT40 STT70 ID number 82368 82394 82393 82495 82494 82392 82495 26207 82395 82490 87454 85241 83646 Description main switch LED element green cap fixing adapter LED element white cap fixing adapter dew point display optional selector switch actuator contact element temperature controller TT1 TT2 timer clock optional seal Spare parts list 11 4 Control unit STT40 85280 motor 84131 radiator 0 7 kW 83339 pull button 87440 contact element 83411 controller 82516 temperature limiter 88440 contactor 85941 terminal 85940 fuse 99102 fuse 88806
30. fficiency You can blow or vacuum the dirt out of the filter with compressed air but remember it could become damaged from high pressure blowing Set the Timer release switch to the C position Recommendations for Cleaning and Replacing Filters e Remove the threaded fastener securing the filter access cover then remove the cover e Remove the nut on the center retaining rod to remove the filter cartridge B Wait until the blower has stopped The blower will continue running for 10 minutes once the dryer is turned off If there is a return air cooler installed switch off the coolant circuit B Switch off the dryer s main power switch the power signal lamp turns off Interrupt the main power supply so that the device cannot be turned on unintentionally LJ Clogged filters substantially reduce the amount of circulating air and lead to a production lag of your dryer Clogged filters may also damage the heating elements Maintenance 5 4 STT40 STT70 5 2 2 Cleaning or Replacing the Return Air Filter STT40 STT70 Figure 1 Air Filter Location amp Disassembly e Detach the screw on the housing of the return air filter and remove the housing cover Return Air Filter e Remove the nut of the filter cartridge e Remove the filter cartridge e Clean the inside of the return air filter housing Use non fibrous cleaning cloths or an industrial type vacuum cleaner e Vacuuming Try vacuum cleanin
31. g a soiled filter first Vacuuming removes most large particles and surface contaminants and may suffice for the first time you clean a filter Use a commercial duty recommended or household vacuum cleaner Vacuum the filter from the air intake dirty side only e Cleaning with Compressed Air Blow clean dry compressed air up and down the pleats blowing from the inside out Remove loose dirt from the filter with compressed air or vaccum from the outside DO NOT clean wash filter with water e After each cleaning e Inspect the filter element Briefly hold a light bulb behind the element and look for any fatigued paper or residual dirt Inspect for holes and tears by looking though the filter toward a bright light Check for damaged gaskets or dented metal parts Do not re use a damaged filter e Check the gasket for damage A damaged gasket allows contaminants into the process Replace as needed e Re install the cleaned new filter cartridge e Rethread the nut that holds the filter in place e Install the lid of the return air filter housing ee Never operate the dryer without a return air filter LT Purchase order numbers for a return air filter on the STT40 70 dryer are when operating without return air cooler ID 83957 when operating with return air cooler ID 83956 Maintenance 5 5 STT40 STT70 5 2 3 Servicing the Dew Point Monitor The accuracy of the dew point monitor on mini dryer systems depends o
32. ger Injury through burns Before beginning maintenance work wait until the drying cells drying hoppers and air piping have cooled down sufficiently Avoid touching any of these parts Danger Injury through burns Remove any granules remaining on the ground Danger of accidents Lock the wheels in place after installation if the dryer is mounted on a movable frame This will prevent danger to people and material Safety instructions 2 4 STT40 STT70 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 components can be damaged by static discharge Before initial operation and at regular intervals make sure that no electrical connections are loose Never readjust sensors without exactly knowing their functions Please ensure that the storage temperature is between 32 to 131 F 0 and 55 C Please ensure that the operation temperature is between 32 to 113 F 0 and 45 C Check the rotation direction of the blowers after the electrical connections have been made see rotational direction arrow Clean the drying hoppers before filling them for the first time Follow the material manufacturers instructions for maximum drying temperature Follow the material manufacturers drying instructions Ensure that
33. h beds to regenerate without material in the hopper If there are two hoppers switch both to position 0 If this is not an initial start up use position I and continue Process Display LED Status LED Ramp Program Use the following steps to adjust the process temperature set point Press PGM key one time a b Use arrow up or down to set the preferred process temperature d c The set point will flash after 2 seconds and then it will be accepted and stored Press EXIT key one time to return to the original screen e Observe actual and set point temperatures both will ramp up or down momentarily to the desired set point temperature 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 self optimize 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 optimization is completed 60 tune pom Wf eer d When self optimization is complete press EXIT key once e At this point the dryer is ready to run continuously Note ff for any reason the FAULT orange light goes on
34. her than 10 F 23 C throughout the process drying cycle e Noticeable amounts of desiccant in the beds is a medium brown color or darker If you notice any of these signs replace the desiccant in the desiccant beds Desiccant replacement kits are available from the Parts Department If you want a technician can repack desiccant beds at your site Handling desiccant material is HAZARDOUS Wear an N 100 type safety filter mask or equivalent to avoid prolonged breathing of desiccant dust Wear safety goggles and gloves to avoid contact with eyes and skin e Handle with adequate ventilation e Wash hands thoroughly after handling FIRST AID In case of eye contact immediately flush eyes with plenty of water for at least 15 minutes SEE A PHYSICIAN IMMEDIATELY IF IRRITATION PERSISTS Maintenance 5 7 STT40 STT70 5 3 2 Replacing Worn Desiccant DESICCANT BEDS ARE HOT DURING OPERATION To avoid burn hazard make sure desiccant beds are sufficiently cool before replacing worn desiccant To access the Desiccant Bed 1 2 3 4 5 6 Figure 2 Desiccant Bed Location and Disassembly 7 9 Disconnect electrical power to the dryer Remove dryer side panels Remove any internal hoses that may be in the way Use nut driver to remove clamps at top and bottom of the desiccant tank Remove the Desiccant Cell leaving valve and Y pipe attached to the dryer With a shop vacuum or by dumping
35. hesive film on the drying hopper has been removed If there is a return air cooler switch on the coolant circuit If there is a timer clock optional adjust it Read the timer clock operating manual Check whether the release switches for the Timer and the Hopper ST1 ST2 are set to the 0 position LJ The trouble signal lamp may flash shortly while the valve block is being changed Start up 3 1 STT40 STT70 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 the optional conveyor unit Attachments which are not supplied by Sterling must be manufactured according to the European Standard 294 safety regulation Check whether the coolant circuit of the return air cooler if a return air cooler is installed is turned on 3 1 1 Switching on the Dryer 1 Turn on the dryers main power switch EL The run signal lamp lights up 2 For operation with timer clock optional GC Turn the Timer switch to the ON position For operation without timer clock Turn the Timer switch to the ON position RA The blower is running If the dryer has not been used for several months it must be run for 2 hours without material Start up 3 2 STT40 STT70 Turn the Hopper release switches ST1
36. ical components from the main power supply before working on them Caution Danger electrical shock hazard Compile a detailed sequence of operating procedures to be carried out on this equipment based on this Operation Instruction Manual Improper operation results in danger of accidents Observe that the control system is still under voltage even when the main power switch is turned off Caution Danger electrical shock hazard Safety instructions 2 2 STT40 STT70 2 1 1 Assembly Compare the connected loads with those of the main power supply Danger electrical shock hazard When using lifting gear please observe the pertaining regulations Caution Danger of accidents Do not modify add other equipment or change the design of the equipment without the approval of the manufacturer Caution Danger of accidents Attachments not supplied by Sterling must be manufactured in accordance with safety regulation EN 294 Danger of accidents The equipment may only be operated when all the associated components are properly connected in accordance with the relevant regulations This avoids injury and damage to equipment Operate the device only if all its components are grounded Danger electrical shock hazard Please note for installation that the equipment is top heavy Danger exists that it may topple over Take care that the device is not standing on the main power cable This will prevent danger to people and material 2 1
37. ing for integrity Check main power switch and ensure that signal lamps are functioning properly Check dew point and temperature tracking with an external dew point monitor and pyrometer Visually inspect the shifting of the airflow valve during one cycle Next scheduled Actual inspection Next scheduled Actual inspection Inspect desiccant Replace if brown or broken Scheduled Actual replacement Scheduled Actual replacement Every two years replacement date Date Work done by replacement date Date Work done by Whenever the material is changed The drying hopper and suction box must be cleaned L The service intervals provided above are based on a 3 shift operation Photocopy this page for your maintenance records Maintenance 5 3 STT40 STT70 5 2 Preventative Maintenance This section describes maintenance procedures which will increase the longevity and efficiency of your dehumidifying dryer Perform them at the regular intervals listed on the dryer checklist on the previous page 5 2 1 Servicing Process Air Filters Caution Operating the dryer without the process air filter installed voids your warranty LH Dehumidifying dryers have a single cartridge canister type filter in the process air loop The filter protects blowers from plastic fines drawn in from the drying hopper and prevents the desiccant from being contaminated Regular filter cleaning is essential to keep your dryer operating at peak e
38. ion box Functional description 6 17 STT40 STT70 A digital display of the current dew point temperature can be supplied as additional equipment An optional timer clock can also be supplied which switches the dryer on or off at preselected times Read the timer clock operating manual 8 1 hopper release switch STT1 STT2 STT2 only STT70 2 dew point display op tional 3 power signal lamp 4 trouble signal lamp 5 main power switch 6 Timer release switch 7 timer clock op tional 8 temperature controller drying hopper STT1 STT2 STT2 only STT70 Figure 10 Operating unit Functional description 6 18 STT40 STT70 6 2 Drying Hopper Optional The material is dried in the drying hopper The dehumidified air is heated and then conducted through the material in the drying hopper and removes moisture Drying hoppers must have the appropriate dimensions for their specific use so that the desired final moisture content is reached When refilling a drying hopper the material must be dried completely before material can be taken out for the first time Time needed to do this is equivalent to the resonance time of that material If material is taken out continuously there must also be a continual addition of material into the drying hopper continuous drying process New moist material is conveyed into the upper opening of the drying hopper and slowly reaches
39. n proper operation of the dew point sensor and the control board The dew point sensor is in the process air stream and is therefore susceptible to contamination Dew point sensor life depends on e Air temperature and flow passing over the sensor e The amount of fines dust in the process air e The amount of plasticizer vapor in the process air Once every six months the dryer operator should monitor the initial dew point sensor readings and establish a periodic replacement schedule as needed Do not attempt to check the continuity or resistance of the dew point sensor The sensor will be destroyed Maintenance 5 6 STT40 STT70 5 3 Corrective Maintenance This section provides you with the information necessary to correct or repair any issues which might appear during the normal operation of your dehumidifying dryer Although we have listed how to perform these procedures it is recommended that you call the Service Department to have any in depth maintenance performed 5 3 1 Symptoms of Worn Desiccant The moisture absorption capacity of the desiccant used in your dehumidifying dryer degrades after an indefinite period of time Useful life depends on variables such as material moisture content plasticizer vapors in the return air and number of regeneration cycles Your dryer may need new desiccant if it exhibits any of the following symptoms e The process air dew point measured with a portable dew point monitor is hig
40. n to original screen e Observe actual and set point temperatures both will ramp up or down momentarily to the desired set point temperature 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 self optimize 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 optimization is completed d When self optimization is complete press EXIT key once e At this point the dryer is ready to run continuously Note ff for any reason the FAULT orange light goes on please go to Chapter 4 in this operation manual for troubleshooting instructions CAUTION DO NOT TURN MAIN POWER DISCONNECT TO THE OFF POSITION WITHOUT FIRST TURNING THE BLOWER SWITCH TO THE OFF 0 POSITION WAIT UNTIL THE BLOWER HAS TIMED OUT PRIOR TO DISCONNECTING MAIN POWER 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
41. on may form which must not under any circumstances return to the dryer 8 2 Grounding the equipment against electrostatic charging Considerable electrostatic charging may occur in the equipment during processing of the various materials For this reason all components must be sufficiently grounded see grounding bolt dryer A and drying hopper B Ensure that all state and local electrical regulations are observed AL eB Figure 14 Grounding the equipment Assembly instructions 8 2 STT40 STT70 8 3 Electrical Connection The electrical connection of the dryer and the hopper heaters may only be done by Sterling service staff or by qualified staff authorized by Sterling Other persons are not permitted to perform any electrical connection Observe the rules of the state and local electricity board The main power switch must be freely accessible Ground the equipment against electrostatic charging The serial tag lists voltage phase and amp draw information Line voltage must be within plus or minus ten percent 10 of the voltage listed on the serial tag or damage may occur Phase imbalance must be less than two percent 2 Connect main power to the dryer at the disconnect or terminals in the lower position of the control enclosure Install a fused disconnect with a lockout feature in the power main leading to the dryer On a regular basis make sure that none of the electrical or screw connection
42. otary switch No compensating lead wires used for extension of the thermocouple Use proper compensating lead wires and terminals Use a dedicated thermocouple Thermocouple and controller are connector If a connector is a connected by wires other than metal different from the Process value is abnormal or proper lead wires thermocouple and controller a not obtained temperature error may result Verify that the thermocouple is properly installed in the inlet tube Sensor is broken or short es Replace with a good sensor circuited Separate input wires as far as possible from the origin of the noise Celsius temperatures used Check to see that proper instead of Fahrenheit or vice temperature setting is in the versa temperature controller Process thermocouple not in airflow The controller is influenced by noise or other induction 9 2 Determining Temperature Controller Errors or Sensor Errors Using a Thermocouple If the controller displays a temperature that is close to room temperature 70 F 21 C when you short circuit controller input terminals the controller is normal and the sensor is probably broken short circuited or incorrectly wired Using a Platinum Resistance Thermometer If the controller displays a temperature of about 0 0 C 32 F when you insert a 100 ohm resistor between terminals A and B of the controller and you short circuit controller terminals B and B the controller is no
43. p 3 6 STT40 STT70 3 3 Switching the Dryer off Turn the Timer switch to the C position B Wait until the blower has stopped The blower will continue running for 10 minutes once the dryer is turned off If there is a return air cooler installed switch off its coolant circuit Turn off the dryer s main power switch Ra The power signal lamp turns off Note For more detailed instructions on the shutting down of this dryer see the quick start guide in Chapter 14 Start up 3 7 STT40 STT70 4 Error and error correction LL This chapter is directed at the operators of the equipment It assumes the operator has general skills in dealing with drying systems and that the start up description has been read and understood Ensure in each and every case that the operators have the relevant skills in operating this equipment Faults must be eliminated before the control system can start operating again An alarm is indicated by the steady light of the trouble signal lamp When the fault has been eliminated the trouble signal lamp turns off Error and error correction 4 1 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 limiter Call the Sterling Service Department
44. please go to Chapter 4 in this operation manual for troubleshooting instructions DO NOT TURN MAIN POWER DISCONNECT TO THE OFF POSITION WITHOUT FIRST TURNING THE BLOWER SWITCH TO THE OFF 0 POSITION WAIT UNTIL THE BLOWER HAS TIMED OUT PRIOR TO DISCONNECTING MAIN POWER CAUTION 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 down mode That means the blower will run for 10 minutes Note This time is utilized to cool down the regeneration heater cell 3 After 10 minutes of run time the blower will turn off but the green light remains lit That means the system is off but the power is still on 4 Turn the disconnect switch to the OFF position as shown The green run light should turn off CAUTION DISCONNECT POWER BEFORE SERVICING DRYER UNIT 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 Heater Connection Thermocouple 3 Turn the disconnect switch to the ON position as sho
45. r dev point pedbrmance Dryer operates beyond its Check dryer and drying hopper capacity sizing Bad dew point sensor Replace Fouled dew point sensor Clear obstruction Air should manifold flow freely through sensor Dirty filter Clean or replace filter element The internal mechanism is not inserted properly into the housing The power supply is not Properly connect the power connected to its terminals supply to the power supply properly terminals No power is supplied or the Supply a voltage of 85 to 125 supplied power is not within the VAC to the power supply specified range terminals of the controller Check control power fuse for continuity Turn disconnect switch and control power switch ON Hopper release switch is notin Turn the hopper release switch the T position to the T position Process thermocouple not in airflow Replace Properly insert the internal mechanism into the housing Nothing displays when the controller is turned on Disconnect switch or Control Power switch not set to ON Control Power fuse blown Troubleshooting 9 3 STT40 STT70 No setting change possible on The key protection switch is set Set the key protection switch to temperature controller to ON OFF Input polarit th l PPI Arie OD ae a et Properly wire the terminals is wrong or connection is wrong Properly set the input with the Input type setting is incorrect input type selector r
46. rmal and the sensor is probably broken short circuited or incorrectly wired Other service problems or questions can be answered by contacting the Service Department Troubleshooting 9 4 STT40 STT70 10 Technical data 10 1 STT40 amount of dehumidified air operating voltage max 1 412 69 ft3 h 40 m3 h 230 V AC 50 Hz special voltages can be supplied upon request connected load calorific output depending on calorific output driving power drying regenerating drying tempera width 11 8 in depth 27 5 in height 35 5 in weight approx 2 6 kW drying max 1 5 kW the equipment with hopper heaters regenerating 0 7 kW 0 37 kW ture max 356 F 180 C 300 mm 700 mm 900 mm 149 9 Ibs 68 kg noise approx 61 dB A options timer clock dew point display return air cooler Return Air Cooler optional water flow rate in the water main network approx 7 16 ft3 h 0 2 m3 h water temperature 42 8 F 6 C pipe connection 0 5 in 12 mm 10 2 STT70 amount of dehumidified air max 2 472 03 ft 3 h 70 m3 h operating voltage 400 V 3 AC 50 Hz special voltages can be supplied upon request connected load 5 0 kW calorific output drying max 3 0 kW depending on the equipment with hopper heaters calorific output regenerating 1 2 kW driving power drying regenerating 0 75 kW drying temperature max 356 F 180 C width 15 7 in 4
47. s become loose Ensure that the main power switch is at the 0 position before carrying out any electrical connection The operating voltage is STT40 230 1 60 STT70 480 3 60 Special voltages can be supplied on request The connected loads are STT40 max 1 1 kW STT70 max 2 0 kW If hopper heaters are installed the value of each hopper heater must be added to these connected loads STT40 max 1 5 kW STT70 max 3 0 kW The fuse protection must have STT40 16A STT70 16A Assembly instructions 8 3 STT40 STT70 8 4 Connection of Return Air Cooler Optional A return air cooler must be used if the return air temperature is higher 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 water main network is for STT40 approx 7 16 ft 0 2 m h STT70 approx 14 13 ft 0 4 m9 h water temperature 42 8 F 6 C Rate your coolant circuit accordingly Connect the coolant in and outlets to the return air cooler Observe the flowing direction of the coolant Check the tightness of the connections Connections are made with 727 NPT Figure 15 Connection of Return Air Cooler STT40 A STT70 B Assembly instructions 8 4 STT40 STT70 9 Troubleshooting 9 1 Introduction The utmost in safety precautions should be observed at all times when working on or around the machine and the electrical components
48. s been contaminated coming into the dryer with resin Note on STT 70 only If so replace the desiccant and remove any resin carry over Otherwise change the phase of two legs of the three phase power drop Replace desiccant See Page 42 for more information Suction in delivery tube pressure from the return tube Troubleshooting 9 1 STT40 STT70 Process heaters are faulty Check tor open heaters Replace if required Solid state temperature Repla controller faulty pane Make sure that plant personnel Process temperature was are aware of the proper adjusted in error by plant temperature set point Post an personnel appropriate sign next to the controller Process heaters are faulty Desiccant beds are Replace desiccant contaminated Drying systems are designed for the material which was originally specified Different materials may need a longer residence time or a different ing temperature Break in flex hose to from Inspect for air leaks replace as drying hopper needed Check for proper operation of valve actuators Repair or replace if necessary Remove blower side plate clean baffles replace Replace filter elements Insufficient power to PLC Check power supply and power PLC R seneration Bed LED Power LED is off wiring to PLC ee Faulty PLC PLC Power light is COR bowie on Run light is off and or Error Replace PLC light i Regenerating bed cooldown we Verify that blower
49. s connected with it These operation instructions are to be used by all persons assigned activities connected with the equipment Knowledge of the English language is a prerequisite For your safety ensure that the operating personnel are familiar with the operating instructions and the function of the equipment Safety instructions 2 1 STT40 STT70 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 first time Contact us should questions arise This avoids injury and damage to equipment These operation instructions must be kept available at all times at the place where the equipment is operating Improper operation results in danger of accidents Please note that not all conceivable cases regarding operation or maintenance of the equipment can be covered in these operating instructions Please observe all safety instructions and warnings on the equipment This avoids injury and damage to equipment All work on the equipment must be carried out by persons whose qualifications are specified in the pertaining chapters of the operation instructions Improper operation results in danger of accidents The proper work clothes must be worn during any work on the equipment is performed This avoids injury The local regulations and requirements pertaining to this equipment must be observed Disconnect electr
50. the desiccant tank Remove and replace the heater with a new heater Rewire the heater and reassemble the desiccant tank Pour desiccant back into the tank Use either the saved desiccant in the bag or new desiccant if it is needed Put the desiccant tank back into the dryer cabinet Inspect the gaskets on the valve assembly Replace if necessary Place the desiccant cell assembly back into the dryer and replace clamps Replace any internal hoses that were removed to change desiccant Maintenance 5 12 STT40 STT70 5 6 Cleaning the Drying Hopper Set the Timer release switch to the C position B Wait until the blower has stopped The blower will continue running for 10 minutes once the dryer is turned off If there is a return air cooler installed switch off the coolant circuit B Switch off the dryer s main power switch the power signal lamp turns off Interrupt the main power supply so that the device cannot be turned on unintentionally Clean the drying hopper each time you change the materials to be dried Make sure that the drying hopper is completely empty and has cooled down sufficiently Remove any granules remaining on the ground Maintenance 5 13 STT40 STT70 STT 25 ae A Open the toggle type fasteners A at the hopper lid pe and fold the hopper lid upwards if in use remove before the single conveyor Clean the drying hopper Close the hopper lid and close the toggle typ
51. the material outlet at the lower end On its way from the upper to the lower end the material is dried down to the final moisture content In order to guarantee a continuous drying process we recommend that you always keep the drying hopper filled completely Figure 11 Drying Hopper Functional description 6 19 STT40 STT70 6 2 1 Hopper Heater Each drying hopper has its own heater The temperature of the dehumidified air is adjusted by means of the temperature controller The setting range is from 140 356 F 60 180 C The current temperature can be read off the digital display actual value If you are drying ata process temperature above 250 F you must use a return air cooler The temperature controller is factory programmed Nevertheless you have to set specific values which are dependent on the processed material Process display drying temperature fi 60 Setpoint display drying temperature 9 __L __ 7 8 O Ki nr PGM key Selecting PGM exp EXIT key operating level or Aborting the input parameter selection Reducing setpoint value Increasing setpoint value Figure 12 Temperature controller Functional description 6 20 STT40 STT70 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
52. the operating personnel what is to be done Operating instructions The operating instructions describe the interaction of the equipment production sequences or methods The operating instructions must be compiled by the operator of the equipment Equipment foreman When several operating personnel work on one machine the equipment foreman coordinates the operating sequences The equipment foreman must be appointed by the operator Trained personnel Trained personnel are persons whom due to their training are authorized to carry out the required work 1 3 Legal basis See Manufacturer s Certificate resp Certificate of Conformity 1 4 Field of application This dryer has been manufactured to dry thermoplastic granules and regrind before processing This machine removes all remaining moisture from the granules both inside and out regardless of climate or ambient air conditions 1 5 Notes on Usage Experienced operators can begin directly with the chapter on Start up if the unit has been properly installed If the unit has not been installed yet observe the instructions in the chapter on Assembly Instructions and Transport Assembly and Storage General Information 1 3 STT40 STT70 2 Safety instructions These safety instructions apply to all persons around the operating equipment Please inform all persons around the operating equipment of the direct and indirect hazard
53. tion ma The blower is running at this point Start up 3 4 STT40 STT70 3 2 2 Setting the Drying Temperature Turn the Hopper ST1 ST2 release switches to the I position For each drying hopper set the required process drying temperature by using the corresponding temperature controller Check whether the set process drying temperature is appropriate for the materials which have been placed in the drying hopper Observe the instructions of the material manufacturer After filling the drying hopper you must wait for the resonance time of the material to pass before using the material for making product Observe the instructions of the material manufacturer PGM Use the following steps to set the temperature controller Press the PGM key By using the arrow keys select the desired value for A v the drying temperature a a After 2 seconds the display will flash and the value is stored Press the EXIT key the setpoint value and the actual value of the drying temperature are displayed After changing materials immediately check and reset the drying temperature Start up 3 5 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 STT40 STT70 rok Y on ne al tunE mY on EXIT Start u
54. uer an et 9 4 LOST LCA AS SE A ces ee nes 10 5 TQS TPAD as cacaratracastantanegelncagaceoanduonnadeasandnaay A A E EA 10 5 TOZ S PETO nn a a a En Sn SN Re ae cet Nine 10 5 10 3 D TENSIONS MCC sc chess sele ied tne a ea aariat 10 6 115 Spare parts MIS lapses SR Eee A ee te i Sale tea Palas fos hat 11 1 12 Plecticalmanual sicseen an eme er re dans 12 1 I Ee AGC SSOMES nue culesiss A nn AT ee dette fente 13 1 STT40 STT70 1 General Information These operation instructions are addressed to all users of this device These operation instructions must be followed by every person working on or with the unit 1 1 Warnings and symbols The following warnings and symbols are used in these operating instructions Q This symbol indicates danger to life Fatal or serious injury is possible if the corresponding instructions regulations or warnings are not observed This symbol indicates that serious injury is possible if the corresponding instructions regulations or warnings are not observed This symbol indicates that extensive damage to equipment is possible if the corresponding instructions regulations or warnings are not observed This symbol indicates that information is important for becoming familiar with the equipment i e technical specifications oY This symbol indicates that a technical term is explained at this point General Information 1 1 STT40 STT70 QOY When disposing of drying agents batteries
55. wn The green run light should light up 4 Turn the dryer operation switch to the desired position If you have a seven day timer installed set it to On with timer position otherwise set it to On without timer position The blower will start An explanation is given in the following diagram On with timer On without timer 5 Turn the hopper heater switch to position Position O Position I 6 Once in position the temperature controller will display as shown below Blower must be running for temperature controller to be on Temperature setting will vary as the processed desired temperature is changed Also a description of the buttons is listed below Note For initial start up or if the dryer has not run for an extended period of time turn the hopper heater switch to position O Wait 2 hours for both beds to regenerate without material in the hopper If there are two hoppers switch both to position 0 If this is not initial start up use position I and continue Process Display LED Status LED Ramp Program Arrow down Arrow up Use the following steps to adjust the process temperature set point Press PGM key one time Use arrow up or down to set the preferred process temperature a b c The set point will flash after 2 seconds and then it will be accepted and stored d Press EXIT key one time to retur

Sterling STT40 Dehumidifier User Manual

Contents

Download Pdf Manuals

Related Search

Related Contents