1. Slide Valve Actuator Troubleshooting Guide 2 of

Section 6 • Troubleshooting

Table 6-1. Slide Valve Actuator Troubleshooting Guide (2 of 2)

Problem

Reason

Solution

	The motor was manually moved
	while the position sensor was not	Recalibrate.
	powered.
The actuator does not transmit the	The motor brake is not working	Get the motor brake to where it op-
correct position after a power loss	The motor brake is not working	Get the motor brake to where it op-
correct position after a power loss	properly	erates freely and then recalibrate.
	properly	erates freely and then recalibrate.

	The position sensor’s EEPROM	Replace the actuator.
	memory has failed	Replace the actuator.
	memory has failed

	The photochopper is misaligned	Try to realign or replace the actuator.
	with the slotted optocouplers	Try to realign or replace the actuator.
	with the slotted optocouplers

There is a rapid clicking noise when	The photochopper is positioned too	Adjust the photochopper so that
the motor is operating	The photochopper is positioned too	the fence extends further into the
the motor is operating	low on the motor shaft.	the fence extends further into the
	low on the motor shaft.	optocoupler slots.
		optocoupler slots.

	A motor bearing has failed	Replace the actuator.

	There is a loose connection in the	Tighten.
	screw terminal blocks	Tighten.
	screw terminal blocks

The motor operates in one direction	There is a loose or dirty connection	Clean and tighten.
The motor operates in one direction	in the yellow Turck cable	Clean and tighten.
only	in the yellow Turck cable

	The position sensor has failed	Replace the actuator.
	The position sensor has failed	Replace the actuator.

	There is a broken motor lead or	Replace the actuator.
	winding	Replace the actuator.
	winding

		The motor will resume operation
	The thermal switch has tripped be-	when it cools. This could be caused
	cause the motor is overheated	by a malfunctioning control panel.
		Consult the factory.

The motor will not move in either	Any of the reasons listed in “The mo-	See above.
direction	tor operates in one direction only”
	The command shaft is jammed	Free the command shaft.

	Broken gears in the gearmotor	Replace the actuator.

	Blown relay or fuse.	Check and replace blown relay and/
	Blown relay or fuse.	or fuse.
		or fuse.

The motor runs intermittently, sev-	Motor is overheating and the ther-	This could be caused by a malfunc-
The motor runs intermittently, sev-	Motor is overheating and the ther-	tioning control panel. Consult the
eral minutes on, several minutes off	mal switch is tripping	tioning control panel. Consult the
eral minutes on, several minutes off	mal switch is tripping	factory.
		factory.

	Bad thermal switch	Replace the actuator.
The motor runs sporadically
The motor runs sporadically	Any of the reasons listed in “The mo-	See above.
	Any of the reasons listed in “The mo-	See above.
	tor will not move in either direction”
The motor runs but output shaft will	Stripped gears inside the gear
The motor runs but output shaft will	motor or the armature has come un-	Replace the actuator.
not turn	motor or the armature has come un-	Replace the actuator.
not turn	pressed from the armature shaft
	pressed from the armature shaft

6 – 2

VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG