Schneider Electric 4000 Troubleshooting, Information in -1 describes potential problems and their

63230-300-212	Chapter 10—Maintenance and Troubleshooting
April 2001	Troubleshooting
TROUBLESHOOTING	The information in Table 10–1describes potential problems and their
	possible causes. It also describes checks you can perform or possible
	solutions for each. After referring to this table, if you cannot resolve the
	problem, contact the your local Square D/Schneider Electric sales
	representative for assistance.

DANGER

HAZARD OF ELECTRIC SHOCK, BURN, OR EXPLOSION

• Beware of potential hazards, wear personal protective equipment, carefully inspect the work area for tools and objects that may have been left inside the equipment.

• Use caution while removing or installing panels so that they do not extend into the energized bus; avoid handling the panels, which could cause personal injury.

Failure to follow this instruction will result in death or serious injury.

Table 10–1: Troubleshooting

Potential Problem	Possible Cause	Possible Solution
The red maintenance LED is	When the red maintenance LED is illuminated, it	Contact your local sales representative for assistance.
illuminated on the circuit monitor.	indicates a potential hardware or firmware
	problem in the circuit monitor.
The green control power LED is	The circuit monitor is not receiving the	Verify that the circuit monitor line (L) and neutral (N)
not illuminated on the circuit	necessary power.	terminals (terminals 25 and 27) are receiving the
monitor.		necessary power.
The display is blank after applying	The display is not receiving the necessary	Verify that the display cable is properly inserted into the
control power to the circuit monitor.	power or communications signal from the circuit	connectors on the display and the circuit monitor.
	monitor.
The data being displayed is	Circuit monitor is grounded incorrectly.	Verify that the circuit monitor is grounded as described in
inaccurate or not what you expect.		“Grounding the Circuit Monitor” on page 54 of the
		installation manual.
	Incorrect setup values.	Check that the correct values have been entered for circuit
		monitor setup parameters (CT and PT ratings, System
		Type, Nominal Frequency, and so on). See “Setting Up the
		Metering Functions of the Circuit Monitor” on page 16 for
		setup instructions.
	Incorrect voltage inputs.	Check circuit monitor voltage input terminals (9, 10, 11,12)
		to verify that adequate voltage is present.
	Circuit monitor is wired improperly.	Check that all CTs and PTs are connected correctly
		(proper polarity is observed) and that they are energized.
		Check shorting terminals. See “Wiring CTs, PTs, and
		Control Power to the Circuit Monitor” on page 38 of the
		installation manual for wiring diagrams. Initiate a wiring
		check from the circuit monitor display.

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