Multiquip MQP20P troubleshooting VOLTAGE REGULATOR, Troubleshooting Voltage Regulator, Symptom

troubleshooting (VOLTAGE REGULATOR)

Troubleshooting (Voltage Regulator)

Symptom	Possible Problem	Solution
	Residual Voltage at regulator power input	Check wiring diagram for proper connections.
		Flash generator speed. Refer to field flashing section
	wires 3 and 4 below 10 VAC?	in generator manual.
		Reduce acceleration time.
	Accelerated time to rated speed too long?	Interrupt power input to regulator after achieving rated
Residual Voltage - No output		speed.
	Field leads F1, F2 not connected?	Connect field leads F1, F2.
	Power input leads not connected?	Connect power input leads 3, 4.
	Blown or missing fuse?	Replace fuse.
	Defective regulator?	Replace regulator.
	Defective generator?	Consult generator manual.
	Incorrect connections?	Check wiring diagram for proper connections.
	Voltage Adjust turned down?	Rotate Voltage Adjust clockwise until the desired
		voltage is reached.
Output Voltage Low
	Remote Voltage Adjust is turned down?	Rotate remote Voltage Adjust clockwise until the
		desired voltage is reached.
	Defective regulator?‑	Replace regulator.
	Voltage Adjust turned too high?	Rotate Voltage Adjust counterclockwise until the
		desired voltage is reached.
Output Voltage High
	Remote Voltage Adjust is turned too high?	Rotate remote Voltage Adjust counterclockwise until
		the desired voltage is reached.
Output Voltage High - No	Defective regulator?	Replace regulator.
Adjustment
Remote Voltage Adjust	Voltage adjust wire connected backwards?	Reverse the wiring of the remote Voltage Adjust.
Operates Backwards
Generator Output Voltage	Stability Adjust not set properly?	Rotate the Stability Adjust clockwise until hunting stops.
Hunting
Poor regulation	Defective regulator?	Replace regulator.

page 40 —MQP20P STANDBY GENERATOR • operation and parts manual — rev. #1 (11/28/11)