Troubleshooting Indication Possible Cause

TABLE 6. TROUBLESHOOTING

	INDICATION	POSSIBLE CAUSE

		AC line open

		Operator controls inoperative or con-
		nected incorrectly

		Open circuit between Connectors E1
		and E2

		Controller not reset

		Line Voltage Selection Jumper J1 in
	1. Motor won’t start	wrong position
	(See “Inoperative
	(See “Inoperative
	Motor,” page 21)	Controller not enabled

		Loss of speed reference signal

		Controller not adjusted correctly

		Open shunt field winding or wiring to
		the motor shunt field, causing loss of
		torquea

		Motor failure

		Control board failure

		Wiring faulty or incorrect

		Circuit, component, or wiring
		grounded

	2. Controller line fuse	SCR1, SCR2, SCR3 or SCR4 shorted
	2. Controller line fuse
	blows when AC line	Bridge Diode D1b shorted
	power is applied to the
	power is applied to the	Varistor RV1 shorted
	controller	Varistor RV1 shorted

		Shunt Field Diode D39, D40, D41, or
		D42 shorted a
		Motor shunt field shorted or groundeda
		Control board failure

	Cont’d on next page

Be sure rated AC line voltage is applied to the controller.

Repair accordingly.

A wire jumper or switch must connect E1 to E2.

Initiate a Stop command and then a Start com- mand.

See Step 5 on page 5 under, “Installing The Controller.”

Be sure +24 VDC is applied to Terminal TB2 8.

Check for 0 - 10 VDC speed reference signal.

Turn the ACCEL and CUR LMT potentiome ters fully counterclockwise (100%).

Check the motor shunt field and associated circuitry for a loose connection or a broken wire. Repair accordingly.

Repair or replace the motor.

Replace the control board.

Check all external wiring terminating in the controller. Correct accordingly.

Remove ground fault.

Replace shorted SCR’s or the control board.

Replace shorted diode or the control board.

Replace RV1 or the control board.

Replace shorted diode or the control board.

Repair or replace the motor.

Replace the control board.