User Manual

13
Worcester Actuation Systems Series 75 Electric Valve Actuator FCD WCAIM2013-01 - 08/04
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Manual Operation
IMPORTANT:
Disconnect actuator from power supply. If power is not
off, motor will start when cam moves from limit switch.
A. 10-2375 W, X and Z: Pull the declutching knob all the way up and
hold. Apply wrench to exposed fl ats on actuator shaft and rotate to
desired position. To reengage, return shaft to original position of
disengagement and release declutch knob.
B. 25-3075 Z: Simply turn manual override handwheel in the desired
direction (clockwise rotation of handwheel causes actuator drive
shaft to rotate clockwise, when viewed from above). The manual
override can be used at any time without damaging the actuator.
NOTE:
Actuator should be manually operated only over the range
for which it is set up to operate electrically. Operation beyond this
range will totally disrupt indexing.
Maintenance and Troubleshooting
The Series 75 electric valve actuator requires no regular maintenance.
Should the unit fail to operate, however, the following are hints for
troubleshooting. If the unit still fails to operate, consult the factory.
Electrical Supply
Be sure the Series 75 is supplied with the correct
voltage.
Electrical Connections
Does the wiring conform to the wiring
diagram?
Limit Switches
If both switches are depressed simultaneously, the
unit will not operate. Make sure the switches trip one at a time.
Capacitor
The AC motors are operated with a capacitor. If the
capacitor is defective, it will prevent the motor from starting and/or
running. Replace if necessary. If capacitor has metal retaining ring,
insulating fi ber washer must be used.
Motor
If one of the motor windings is open or short-circuited, the unit
will not operate. If motor is hot, allow it to cool down so that the stator
is at room temperature. Apply voltage to motor. If motor still fails to
operate, replace entire motor module.
DC Motors
DC motors use no thermostat and are therefore not
protected against high temperatures and currents. Use of these motors
above rated torques (loads) and/or duty cycle can cause permanent
damage. If DC motor(s) fail(s) to operate under minimal torque loading,
or if one of the two motors fail, replace entire motor module.
NOTE:
Failure of one motor on dual DC motor module may mechani-
cally damage the gear train.
Gear Train
10-2375 (All)
Remove motor module from the actuator. Rotate the
motor by hand. Spinning the motor shaft should rotate the module
output pinion. If module output pinion fails to rotate, replace entire
motor module. Also, check bull gear for missing or broken teeth.
Replace if necessary.
25-3075 (All)
Remove actuator from valve. Rotating the motor shaft
manually should cause the actuator output shaft to rotate. If output
shaft does not rotate, gearing has been damaged. Return actuator to
factory for repair.
Valve
The problem may lie with the valve instead of with the actuator.
Check the operation of the valve by removing the actuator and operating
the valve by hand.
Options
For troubleshooting or adjustment of options, see Options
and Adjustment section for individual options.
Spare Parts
The following are recommended spare parts which should be kept on
hand for Series 75 electric actuators:
1 Limit Switch Kit
1 Capacitor (AC Units Only)
When ordering spare parts, please specify actuator size, voltage and
cycle time.