Emerson 2330MKII manual Troubleshooting, Indication Possible Cause Corrective Action

		BOOK 0958-B
	TABLE 6. TROUBLESHOOTING
INDICATION	POSSIBLE CAUSE	CORRECTIVE ACTION
	Low line voltage	Check for rated line voltage, ±10%, on the
		controller line terminals.
		Check shunt field current.a Low shunt field
		current causes excessive armature current. If
		field current is adequate, check for a mechani
	Motor overloaded	cal overload. If the unloaded motor shaft does
		not rotate freely, check motor bearings. Also
		check for a shorted motor armature. Motor
7. Motor won’t reach top		overload can also be caused by incorrect gear
		ratio. Correct accordingly.
speed
	Maximum speed set too low	Turn the MAX SPD potentiometer clockwise.
	Current limit set too low	Turn the CUR LMT potentiometer clockwise.
	Current scaling jumper J4 in wrong	See Step 4 and Table 2 on page 5.
	position
	Motor field demagnetizedb	Replace the motor.
	Control board failure	Replace the control board.
		Observe line voltage with a voltmeter or oscil
	AC line voltage fluctuating	loscope. If fluctuations occur, correct condi
		tion accordingly.
	Loose or corroded connection. Wiring	Check all terminals, connections, and wiring
		between the line, operator controls, controller,
	faulty, incorrect, or grounded
		and motor.
	Oscillating load connected to the	Stabilize the load. Turning the IR/TACH
		potentiometer counterclockwise may mini
	motor
		mize oscillations.
8. Unstable speed	Voltage Selection Jumpers J1, J2 or J3	See Step 5 on page 5 under, “Installing The
	in wrong position	Controller.”
	IR compensation not adjusted cor-	See the IR Compensation adjustment instruc
	rectly	tions on page 23.
	Maximum speed not adjusted correctly	See the Maximum Speed adjustment instruc
		tions on page 23.
	Motor faulty	Check motor brushes. Replace if needed.
		Repair or replace the motor.
	Tachometer generator or coupling	Repair accordingly.
	faulty (if used)
Cont’d on next page

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