Sterling STT70, STT40 manual Troubleshooting, Introduction

Page 52

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. 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.

Problem

Possible cause

Corrective action

 

 

 

 

Dirty filter.

Clean or replace filter.

 

Desiccant beds are contaminated

Replace desiccant. See Page 42

 

by material or plasticizer leaking

 

for more information.

Little or no air coming from

into the system.

 

the process delivery tube.

Blower overload has tripped.

Fix the problem and reset the

 

overload.

 

 

 

Blower fins filled with dust or

Remove blower side plate,

 

contaminants.

clean baffles, replace.

 

 

Stop the dryer.

 

 

If the dryer was connected to

 

 

the drying hopper, check to see

 

Phase is reversed on power drop

if the desiccant and process air

Suction in delivery tube,

heater has been contaminated

coming into the dryer.

with resin.

pressure from the return tube.

(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.

Troubleshooting 9-1

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Page 51 Page 53
Contents Operation Instructions Dehumidified air dryer STT40 STT70STT40 / STT70 STT40 / STT70 Table of contents 10-5 General Information STT40 / STT70 Legal basis Explanations and informationField of application Safety instructions General Assembly OperationMaintenance For the safety of the device Start up Switching on the Dryer Initial OperationPower signal lamp turns off For operation with the optional timer clock Switching the Dryer onContinuous Operation Setting the Drying Temperature Autotuning the temperature controller Switching the Dryer off Error and error correction Regeneration heater Following errors can cause an alarm BlowerHopper heater Maintenance STT40 / STT70 Maintenance schedule System model # Serial # Every weekRecommendations for Cleaning and Replacing Filters Preventative MaintenanceServicing Process Air Filters Cleaning or Replacing the Return Air Filter STT40 / STT70Servicing the Dew Point Monitor Corrective Maintenance Symptoms of Worn DesiccantReplacing Worn Desiccant Remove Hose ClampsDisposing of Drying Agents Required Desiccant AmountsRemove Clamp Process Heater Procedures Replacing the Process HeaterReplacing/Cleaning the Cooling Coils Cooling Coil LocationReplacing the regeneration heating coil Heating CoilCleaning the Drying Hopper STT STT 60Functional description General Information ➅ ➄ Read the timer clock operating manual Drying Hopper Optional Drying HopperTemperature controller Hopper HeaterDefault Settings for Jumo TEMP. Controller Contact informationConnection to a Pneumatic Conveying System Optional Return Air Cooler OptionalTransporting, Assembly and Storage Transporting and Packing Assembly StorageAssembly instructions Grounding the equipment against electrostatic charging Grounding the equipmentElectrical Connection Connection of Return Air Cooler Optional STT70Troubleshooting IntroductionSTT40 / STT70 Check resin manufacturer’s data Using a Thermocouple Determining Temperature Controller Errors or Sensor ErrorsUsing a Platinum Resistance Thermometer Technical data STT40STT70 Return Air Cooler optionalDimension Sheet Spare parts list STT40 Pos ID-number DescriptionSTT70 Operating unit Pos ID-number Description Control unit STT40 Control unit STT70Electrical manual Accessories Code Basic temperature controller settings STT40Parameter Parameter set Basic temperature controller settings STT70 Quick Start Guides For STT 40 DryerOn with timer On without timerPosition O Arrow down Process Display LED Status LED Ramp/Program Set PointArrow up Page Proper Shut-down Guide for STT 40 Dryer Quick Start Guide for STT 70 Dryer Main power High Temp SafetyHeater Connection Thermocouple Exit Page Proper Shut-down Guide for STT 40 Dryer Parts Department

STT40, STT70 specifications

The Sterling STT40 and STT70 are one of the most noteworthy entries in the landscape of compact, high-performance generators, designed to serve a variety of applications in both residential and commercial settings. Built with cutting-edge technology, these models exhibit durability and reliability, ensuring that power needs are met efficiently.

The Sterling STT40 is a robust 40 kW generator that is ideal for small businesses, remote sites, and residential backup power. It features a high-quality diesel engine, providing fuel efficiency along with impressive power output. The generator incorporates a fully automatic transfer switch (ATS), which ensures seamless power transition during outages. With an IP54 rating, it offers excellent protection against dust and water, making it suitable for outdoor use in diverse environments.

In contrast, the Sterling STT70 boasts a greater power output of 70 kW, making it suited for larger commercial applications or industrial uses. Similar to the STT40, the STT70 is equipped with a top-tier diesel engine that delivers optimal performance and longevity. Its heavy-duty construction allows it to operate efficiently under strenuous conditions. The STT70 also features advanced cooling systems and a sound-attenuated enclosure, which minimizes operational noise, making it a perfect choice for noise-sensitive situations.

Both models utilize innovative technologies to enhance user experience and operational efficiency. An intuitive digital control panel simplifies monitoring and management, providing real-time data on voltage, current, and frequency. This allows users to make informed decisions about power usage and maintenance needs. Additionally, remote monitoring capabilities enable owners to oversee generator performance from virtually anywhere, maximizing uptime.

Safety is another key aspect of both generator models. They are equipped with automatic shutdown features that activate in the event of low oil pressure or overheating, minimizing the risk of damage and ensuring safety during operation.

In summary, the Sterling STT40 and STT70 generators stand out in the market due to their reliability, advanced technology, and robust safety features. They are perfect for anyone seeking dependable power solutions, whether for residential, business, or industrial needs. With their combination of power efficiency and durability, they remain top contenders in the generator space.
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