Emerson VSSG, VSG 1. Slide Valve Actuator Troubleshooting Guide 2 of, Problem, Reason, Solution

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
	properly	erates freely and then recalibrate.
	The position sensor’s EEPROM	Replace the actuator.
	memory has failed
	The photochopper is misaligned	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 fence extends further into the
	low on the motor shaft.
		optocoupler slots.
	A motor bearing has failed	Replace the actuator.
	There is a loose connection in the	Tighten.
	screw terminal blocks
The motor operates in one direction	There is a loose or dirty connection	Clean and tighten.
	in the yellow Turck cable
only
	The position sensor has failed	Replace the actuator.
	There is a broken motor lead or	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/
		or fuse.
The motor runs intermittently, sev-	Motor is overheating and the ther-	This could be caused by a malfunc-
		tioning control panel. Consult the
eral minutes on, several minutes off	mal switch is tripping
		factory.
	Bad thermal switch	Replace the actuator.
The motor runs sporadically
	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
	motor or the armature has come un-	Replace the actuator.
not turn
	pressed from the armature shaft

6 – 2 VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG