38
Slide Valve Actuator Troubleshooting Guide
The actuator cannot be cali-
brated
The actuator goes into calibra-
tion mode spontaneously
The actuator goes into calibra-
tion mode every time power is
restored after a power loss
Dirt or debris is blocking one or both
optocoupler slots
The photochopper fence extends 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 po-
sition 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 calibration procedure
The white calibrate wire in the grey
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 ac-
tuator or grey cable
There is an intermittent failure of the
position sensor
The motor brake is not working prop-
erly (see theory section above.)
Clean the optocoupler slots with
a Q-Tip and rubbing alcohol.
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 con-
tact 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 elec-
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.
Tape the end of the white wire
in the panel and make sure that
it cannot touch metal.
Increase the distance between
the EMI source and the actua-
tor.
Install additional metal shield-
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.
Replace the actuator
Summary of Contents for VSM 71-701
Page 1: ...1 VPN 35391S February 2006 Rev 05 Price 60 00...
Page 2: ...2...
Page 20: ...20...
Page 52: ...53 Pre Start Up Check List...
Page 99: ...99 Recommended Spare Parts List...
Page 104: ...104 Gate Rotor...
Page 110: ...110 Main Rotor VSS...
Page 112: ...112 Main Rotor VSR...
Page 114: ...114 Slide Valve Cross Shafts and End Plate...
Page 118: ...118 Capacity Slide Volume Slide Carriage Assembly Slide Valve Carriage Assembly...
Page 134: ...134 Miscellaneous Frame Components VSS Screw Compressor VSR Mini Screw Compressor...
Page 138: ...138 C FlangeAdapter Components 630 620 610 640 601 641 630 601 620 610 640 641 642 650 651...
Page 140: ...140 Replacement Parts Tools...
Page 144: ...144 GaterotorAssembly...
Page 148: ...148 Main Rotor Slide Valve Cross Shafts and End Plate Models 71 401 Only Counter clockwise...
Page 152: ...152 Main Rotor Slide Valve Cross Shafts and End Plate Model 501 701 Only Clockwise...
Page 154: ...154 Volume Ratio Capacity Slide Carriage Assembly Slide Valve Carriage Assembly...
Page 158: ...158 Miscellaneous Frame Components Model VSM 501 701 Model VSM 71 401...
Page 160: ...160 Replacement Parts Accessories Housing Accessories C Flange Assembly...
Page 166: ...166 Haight Pumps...
Page 170: ...3 Refrigerating Specialties Division...
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Page 244: ...168...