Sterling SDAA 25-100 specifications Problem Possible cause Corrective action

	Problem	Possible cause	Corrective action
		Process heaters are faulty.	Check for open heaters. Replace
			if required.
		Solid-state temperature	Replace.
	Loss or reduction of process air	controller faulty.
			Make sure that plant personnel
	temperature.
		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.	Replace.
		Desiccant beds are	Replace desiccant.
		contaminated.
			Drying systems are designed for
		Material being dried differs	the material which was
			originally specified. Different
		from material specified at the
			materials may need a longer
		time of purchase.
Loss or reduction in drying			residence time or a different
			drying temperature.
capacity.
		Break in flex hose to/from	Inspect for air leaks; replace as
		drying hopper.	needed.
		Airflow valve sticking or failing	Check for proper operation of
			valve actuators. Repair or
		to shift.
			replace if necessary.
		Blower fins filled with dust or	Remove blower side plate,
			clean baffles, replace.
		contaminants.
			Replace filter elements.
		Insufficient power to PLC	Check power supply and power
	PLC Regeneration Bed LED	(Power LED is off).	wiring to PLC.
		Faulty PLC (PLC Power light is
	indicators both off.		Replace PLC.
		on, Run light is off, and/or Error
		light is on).
		Regenerating bed cooldown.	None.
		Blower Input indicator is off.	Verify that blower contactor is
			on. Check input wiring to PLC.
	PLC Regeneration Heater	Process air in high-temperature	None.
		condition.
	Left/Right output indicators both
		Insufficient power to PLC	Check power supply and power
	off.	(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).

Dehumidifying Dryers Chapter 6: Troubleshooting 49 of 59