Table of Contents
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Section 6 • Troubleshooting
Table 6-1. Slide Valve Actuator Troubleshooting Guide (1 of 3)
Problem
The actuator cannot be calibrated.
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
Reason
Dirt or debris is blocking one
or both optocoupler slots.
The photo-chopper fence ex-
tends less than about half way
into the optocoupler slots.
The white calibrate wire in the
grey Turck cable is grounded.
Dirt and/or condensation on
the position sensor boards are
causing it to malfunction.
The calibrate button is stuck
down.
The position sensor has failed.
Push button is being held
down for more that ¾ second
when going through the cali-
bration procedure.
Solution
Clean the optocoupler slots with a cot-
ton swab and rubbing alcohol.
Adjust the photo-chopper so that the
fence extends further into the optocou-
pler slots. Make sure the motor brake
operates freely and the photo-chopper
will not contact the optocouplers when
the shaft is pressed down.
Tape the end of the white wire in the
panel and make sure that it cannot
touch metal.
Clean the boards with an electronics
cleaner or compressed air.
Try to free the stuck button.
Replace the actuator.
Depress the button quickly and then let
go. Each ¾ second the button is held
down counts as another press.
6 – 1
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Table of Contents
Troubleshooting
