Sterling Plumbing scc2 specifications General Troubleshooting

Chapter 7: Troubleshooting

7-1	General Troubleshooting
Problem		Possible Cause	Solution
The control panel doesn’t light up at		The control panel is not turned on.	Turn on the control panel.
all
		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.
The touch screen display doesn’t		Fuse in display is blown.	Replace.
come on when the control panel is		Loose wiring to display.	Repair.
powered up.
		Power supply problem.	Check 24V DC source.
		Display is faulty.	Replace.
A pump package doesn’t run, even		The motor overload has tripped.	Reset the overload and check the
though it is on-line and its indicator			motor for the proper amp draw on
is lit.			tag.
		Hoppers not assigned/no demand.	Check hopper assignment, verify
			hoppers are online.
		Main fuse in power drop or optional	Replace the fuse.
		fused disconnect has blown.
		Motor contact is faulty.	Repair or replace as required.
A vacuum receiver is being by-		The hopper is off-line.	Use the controller to put the vacuum
passed in the loading cycle.			receiver on-line.
		Faulty level sensor or loose.	Check level sensor/wiring.
		The convey time for the hopper is	Use the controller to enter a longer
		set to zero.	convey time.
		The field-installed station bypass	Normal operation. Set the switch so
		switch is simulating a Bin Full	the vacuum receiver is back in the
		condition.	loading sequence.
		The field-installed station bypass	Repair, replace, or re-wire.
		switch is bad or mis-wired.
		The vacuum receiver was assigned	Repeat the setup procedure and
		to the wrong pump during setup.	verify that the pump is on.
Vacuum hoppers are overfilling.		Conveying times are too long (Time	Time the vacuum receiver (s) during
		Fill Mode only).	loading, and set the conveying times
			to a few seconds less.
		Maximum conveying times are too	Check proximity sensors for proper
		long, and the PLC does not	operation and proper wiring to the
		recognize the Vacuum Receiver Full	PLC. Repair as needed. Reset the
		Proximity Switch(es).	conveying times to a reasonable
			value, and adjust as needed.
		Special convey is enabled and	Disable special convey. Reduce
		convey time is too long.	convey time.
Power is present but control will not		Check PLC. See if fault light is on.	Reload software. See page 43.
function.		Loose communication cable between	Verify wiring.
		PLC and display

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