Sterling 1-Pump 5-Station Controller service manual General Troubleshooting

8		Troubleshooting
8-1	General Troubleshooting
Problem		Possible Cause	Solution
The control panel doesn’t light up		The control panel is not turned	Turn on the control panel.
at all		on.
		The external disconnect	Close the switch (on).
		(recommended) in the dedicated
		circuit is open (off).
		Fuse/circuit breaker in the power	Replace/reset.
		drop is blown/tripped.
		Control power switch is broken.	Replace.
A pump package doesn’t run,		The motor overload has tripped.	Reset the overload and check
even though it is on-line and its			the motor for the proper amp
indicator is lit.			draw on tag.
		Main fuse in power drop or	Replace the fuse.
		optional fused disconnect has
		blown.
		Motor contact is faulty.	Repair or replace as required.
A vacuum receiver is being by-		The vacuum receiver is off-line.	Use the controller to put the
passed in the loading cycle.			vacuum receiver on-line.
		The convey time for the vacuum	Use the controller to enter a
		receiver is set to zero.	longer convey time.
		The field-installed station bypass	Normal operation. Set the switch
		switch is simulating a Bin Full	so the vacuum receiver is back in
		condition.	the loading sequence.
		The field-installed station bypass	Repair, replace, or re-wire.
		switch is bad or mis-wired.
		The vacuum receiver was	Repeat the setup procedure.
		assigned to the wrong pump
		during setup.
Vacuum receivers are overfilling.		Conveying times are too long	Time the vacuum receiver (s)
		(Time Fill Mode only).	during loading, and set the
			conveying times to a few
			seconds less.
		Maximum conveying times are	Check proximity sensors for
		too long, and the PLC does not	proper operation and proper
		recognize the Vacuum Receiver	wiring to the PLC. Repair as
		Full Proximity Switch(es).	needed. Reset the conveying
			times to a reasonable value, and
			adjust as needed.

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