Roberts Gorden NEMA 4 installation manual Flow Chart continued, Troubleshooting

38

Yes
		Is there 24 Vac across 24 V	Secure wiring between 24 V
Verify external wiring			Output #8 on control board
	No	input connection #8 on the No
diagrams, Does the pump		relay board?	and 24 V input connection
turn on?			#8 on relay board.
		Yes

Troubleshooting

ROBERTS GORDON®

Yes

Replace plug-in relay.	No	Is the red LED on plug-in
See Replacement Parts
		relay #8 on the relay board Yes
section.		lit?

Yes

Is there 120 V at output # 8

on the relay board?

No

Replace plug-in relay or

relay board. See

Replacement Parts section.

Refer to the VFD

manufacturer's Installation and Operation Manual to clear error.

Yes

	Is there 120 V into 120 V
Yes	relay in the variable	Yes
	frequency drive assembly.
	No
	Rectify wiring between
	controller and 120 V relay.

Is there 120 V (230 V for

Is there continuity between output terminals on 120 V relay.

No

Replace 120 V relay. See Replacement Parts section.

Yes

Yes

Flow Chart (continued)

ULTRAVAC™ CONTROLLER INSTALLATION MANUAL

Yes

Is there continuity between VFD terminals 1 and 11?

No

Rectify wiring between 120 V relay and VFD terminals 1 and 11.

Check circuit breaker and

power supply.

No

Is there power (120 V or 230 V) between the rotary disconnect inputs?

Yes

Turn rotary disconnect switch to the ON position. See Section 6.1.

Yes

Is there power (120 V or 230 V) between the rotary disconnect outputs?

Yes	Is the LCD display	Yes
	of the VFD on?

No

Is there power (120 V or

230 V) between L1 and Yes L2/N inputs on the VFD?

No

Is there power (120 V or

230 V) between fuse Yes holder outputs?

	No
No	Is there power (120 V or	Yes
	230 V) between fuse
	holder inputs?

No	Replace rotary disconnect
	base block.

Is there an error showing

on the LED display?

Replace VFD. See

Replacement Parts

section.

Rectify wiring between fuse

holder outputs and VFD power inputs L1 and L2/N

Replace fuse. See

Replacement Parts

section.

460 V models) between any No two output (motor) terminals No

(U,V or W)? Yes

Is there power between any

two input wires at the No pump?

Yes

Is the pump motor hot? Yes

No

Disconnect power to the motor. Does the motor shaft turn freely?

No

Is the pump impeller

obstructed?

No

Motor bearings may have failed. Repace motor.

Replace VFD. See

Replacement Parts

section.

Rectify wiring between

VFD and pump.

Motor may have tripped

overload. Wait 10-15 minutes and reset.