Emerson VSS Manuel D’Utilisation
39
The actuator cannot be cali-
brated
brated
The actuator goes into cali-
bration mode spontane-
ously
bration mode spontane-
ously
The actuator goes into cali-
bration mode every time
power is restored after a
power loss
bration mode every time
power is restored after a
power loss
Dirt or debris is blocking one or
both optocoupler slots
both optocoupler slots
The photochopper fence extends
less than about half way into the
optocoupler slots
less than about half way into the
optocoupler slots
The white calibrate wire in the grey
Turck cable is grounded
Turck cable is grounded
Dirt and/or condensation on the
position sensor boards are causing
it to malfunction
position sensor boards are causing
it to malfunction
The calibrate button is stuck
down
down
The position sensor has failed
Push button is being held down for
more that ¾ second when going
through the calibration procedure
more that ¾ second when going
through the calibration procedure
The white calibrate wire in the grey
Turck cable is grounding intermit-
tently
Turck cable is grounding intermit-
tently
A very strong source of electromag-
netic interference (EMI), such as a
contactor, is in the vicinity of the
actuator or grey cable
netic interference (EMI), such as a
contactor, is in the vicinity of the
actuator or grey cable
There is an intermittent failure of
the position sensor
the position sensor
The motor brake is not work-
ing properly (see theory section
above.)
ing properly (see theory section
above.)
Clean the optocoupler slots
with a Q-Tip and rubbing alco-
hol.
with a Q-Tip and rubbing alco-
hol.
Adjust the photochopper so
that the fence extends further
into the optocoupler slots.
Make sure the motor brake
operates freely and the pho-
tochopper will not contact the
optocouplers when the shaft is
pressed down.
that the fence extends further
into the optocoupler slots.
Make sure the motor brake
operates freely and the pho-
tochopper 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
in the panel and make sure that
it cannot touch metal
Clean the boards with an elec-
tronics cleaner or compressed
air.
tronics 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.
then let go. Each ¾ second the
button is held down counts as
another press.
Tape the end of the white wire
in the panel and make sure that
it cannot touch metal.
in the panel and make sure that
it cannot touch metal.
Increase the distance between
the EMI source and the actua-
tor.
the EMI source and the actua-
tor.
Install additional metal shield-
ing material between the EMI
source and the actuator or
cable.
ing material between the EMI
source and the actuator or
cable.
Replace the actuator.
Get the motor brake to where it
operates freely and recalibrate.
operates freely and recalibrate.
Replace the actuator.
Slide Valve Actuator Trouble Shooting Guide
Problem Reason Solution