Emerson Vission 20/20 Operation And Service Manual page 100

Section 14 • Slide Calibration
Problem
There is a rapid clicking noise when
the motor is operating. (Continued)
There is a rapid clicking noise when
the motor is operating.
The motor operates in one direction
only.
The motor will not move in either
direction.
The motor runs intermittently, sev-
eral minutes on, several minutes off.
The motor runs sporadically.
The motor runs but output shaft will
not turn.
14 – 8
Table 14-2. Slide Valve Troubleshooting Guide (2 of 2)
The position sensor's EEPROM
memory has failed.
The photo-chopper is misaligned
with the slotted optocouplers.
The photo-chopper is positioned too
low on the motor shaft.
A motor bearing has failed.
There is a loose connection in the
screw terminal blocks.
There is a loose or dirty connection
in the yellow Turck cable.
The position sensor has failed.
There is a broken motor lead or
winding.
The thermal switch has tripped be-
cause the motor is overheated.
Any of the reasons listed in "The mo-
tor operates in one direction only".
The command shaft is jammed.
Broken gears in the gear-motor.
Blown relays or fuses.
Motor is overheating and the ther-
mal switch is tripping.
Bad thermal switch.
Any of the reasons listed in "The mo-
tor will not move in either direction".
Stripped gears inside the gear rotor,
or the armature has come unpressed
from the armature shaft.
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0
Reason
Replace the actuator.
Try to realign or replace the actuator.
Adjust the photo-chopper so that
the fence extends further into the
optocoupler slots.
Replace the actuator.
Tighten.
Clean and tighten.
Replace the actuator.
Replace the actuator.
The motor will resume operation
when it cools. This could be caused
by a malfunctioning control panel.
Consult the factory.
See above.
Free the command shaft.
Replace the actuator.
Check and replace blown relays and/
or fuses.
This could be caused by a malfunc-
tioning control panel. Consult the
factory.
Replace the actuator.
See above.
Replace the actuator.
Solution