Sterling 882.00379.00 manual Problem Possible Cause Possible Remedy

Problem	Possible Cause	Possible Remedy
	The bin below the vacuum	Normal operation. When
	receiver is full if the amber	hopper level drops, material
	receiver indicator light is off.	begins conveying to it.
	The receiver is off line.	Put it on line via menus.
	Static convey time was set to	Put in a reasonable convey
	zero.	time via menus.
	Field installed station by-	Normal operation. Throw
		field-installed switch to put
	pass switch is simulating a
		hopper back in the loading
	bin-full condition.
		sequence.
	The field-installed station	Repair, replace, or rewire.
	bypass switch is bad or
A vacuum receiver bypasses	miswired.
in the Loading cycle.		Supply 80 psi (552 kPa)
(Refer to enclosed Control	Insufficient compressed air	compressed air to all
	to shift valves.	compressed air- operated
Panel Manual)
		valves.
		Standard switch is normally
	The Bin-Full switch sensor	open, held closed by the
		magnet. Check for the
	fails to close.
		presence of the magnet and
		for proper switch operation.
	The Receiver-Full proximity	Wipe off the proximity
	sensor is fouled, creating a
		sensor. Re-adjust if needed;
	false reading (Volume Fill
		see Page 76.
	systems only).
	The Receiver-Full proximity	Replace.
	sensor has failed closed
	(Volume Fill systems only).
Pressure is present at the	Improper pump rotation.	Switch any two wires at the
		incoming power.
vacuum inlet.	Blowback solenoid failed	Check filter chamber or
	open.	pump.
	Material supply empty.	Refill the supply.
	Material supply bridging.	Agitate material supply.
	Pick up device not in supply.	Re-insert the probe.
No-Convey alarm.	Flapper stuck in open	Clear flapper of obstructions.
	position.
(Part of vacuum control	Power to vacuum pump off.	Inspect power.
	Bad level sensor.	Replace level sensor.
panel. Refer to enclosed
Control Panel Manual)	Plugged material line.	Find and remove obstruction.
	Vacuum line leak.	Find and repair leak.
	Sequence-T valve problem	Check for signal, sufficient
		compressed air, proper
	(where used).
		wiring and operation.

Conveying System Mechanical Components Chapter 6: Troubleshooting 95 of 138