Emerson VSG, VSSG manual Troubleshooting, Problem, Reason, Solution

Section 6 • Troubleshooting

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

Problem

Reason

Solution

	Dirt or debris is blocking one or both	Clean the optocoupler slots with a
	optocoupler slots	Q-Tip and rubbing alcohol.
		Adjust the photochopper so that
		the fence extends further into the
	The photochopper fence extends	optocoupler slots. Make sure the
		motor brake operates freely and
	less than about half way into the
		the photochopper will not contact
	optocoupler slots
		the optocouplers when the shaft is
		pressed down.
The actuator cannot be calibrated or	The white calibrate wire in the grey	Tape the end of the white wire in the
		panel and make sure that it cannot
exit calibration mode	Turck cable is grounded
		touch metal
	Dirt and/or condensation on the	Clean the boards with an electronics
	position sensor boards are causing it
		cleaner or compressed air.
	to malfunction
	The calibrate button is stuck down	Try to free the stuck button.
	The position sensor has failed	Replace the actuator.
	Push button is being held down for	Depress the button quickly and then
	more that ¾ second when going
		let go. Each ¾ second the button is
	through the calibration proce-
		held down counts as another press.
	dure
	The white calibrate wire in the	Tape the end of the white wire in the
	grey Turck cable is grounding	panel and make sure that it cannot
	intermittently	touch metal.
		Tape the end of the white wire in the
The actuator goes into calibration	A very strong source of electromag-	panel and make sure that it cannot
	netic interference (EMI), such as a	touch metal.
mode spontaneously	contactor, is in the vicinity of the ac-	Install additional metal shielding ma-
	tuator or grey cable	terial between the EMI source and
		the actuator or cable.
	There is an intermittent failure of the
	position sensor	Replace the actuator.
The actuator goes into calibration	The motor brake is not working prop-	Get the motor brake to where it
mode every time power is restored	erly (see theory section above.)	operates freely and recalibrate.
after a power loss
	The motor was manually moved
	while the position sensor was not	Recalibrate.
The actuator does not transmit the	powered.
	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

VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG 6 – 1