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Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Slide Valve Troubleshooting Guide
The Analog output card of the Vission 20/20 produces a 4–20mA signal to any attached devices. However, it is not
uncommon that small differences in the board components might result in small differences in the output. So this
screen offers the operator the ability to fi ne tune the upper and lower output values, see Table 14-2. Slide Valve
Troubleshooting Guide.
Table 14-2. Slide Valve Troubleshooting Guide (1 of 2)
Problem Reason Solution
The actuator cannot be calibrated.
Dirt or de
bris is blocking one or both
optocoupler slots.
Clean the optocoupler slots with a
cotton swab and rubbing alcohol.
The photochopper fence extends
less than about half way into the
optocoupler slots.
Adjust the photochopper so that
the fence extends further into the
optocoupler slots. Make sure the
motor brake operates freely and
the photochopper will not contact
the optocouplers when the shaft is
pressed down.
The white calibrate wire in the grey
Turck cable is grounded.
Tape the end of the white wire in the
panel and make sure that it cannot
touch metal.
Dirt and/or condensation on the
position sensor boards are causing it
to malfunction.
Clean the boards with an electronics
cleaner or compressed air.
The calibrate button is stuck down. Try to free the stuck button.
The position sensor has failed. Replace the actuator.
The actuator goes into calibration
mode spontaneously.
Push button is being held down for
more that ¾ second when going
through the calibration procedure.
Depress the button quickly and then
let go. Each ¾ second the button is
held down counts as another press.
The white calibrate wire in the
grey Turck cable is grounding
intermittently.
Tape the end of the white wire in the
panel and make sure that it cannot
touch metal.
A very strong source of electromag-
netic interference (EMI), such as a
contactor, is in the vicinity of the
actuator or grey cable.
Increase the distance between the
EMI source and the actuator.
Install additional metal shielding ma-
terial between the EMI source and
the actuator or cable.
The actuator does not transmit the
correct position after a power loss.
The motor was manually moved
while the position sensor was not
powered.
Recalibrate.
The motor brake is not working
properly.
Get the motor brake to where it op-
erates freely and then recalibrate.
The position sensor’s EEPROM
memory has failed.
Replace the actuator.
There is a rapid clicking noise when
the motor is operating.
The photochopper is misaligned
with the slotted optocouplers.
Try to realign or replace the actuator.
The motor brake is not working
properly.
Get the motor brake to where it op-
erates freely and then recalibrate.
Section 14 • Slide Calibration