User Manual

11
Worcester Actuation Systems Series 75 Electric Valve Actuator FCD WCAIM2013-01 - 08/04
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D. Extra Limit Switches (M1 or M2)
1. Setting:
NOTE:
Switches and cams are set at factory. If resetting is
necessary, use the following procedure:
a. Bring actuator into position desired to actuate extra switch.
Turn extra cam in direction of normal travel until switch just
throws.
b. Advance cam in same direction by 1–3° and secure cam by
tightening the set screw (4).
For M2, a fourth switch (not shown) is added over SW2.
The fourth cam (not shown) is positioned so that cam
set screw faces terminal strip when cam is in contact
with limit switch to give desired function. Cam lobe must
approach switch lever from lever pivot end and not from
free end—see Typical Top View on page 9. Follow setting
instructions on last page.
E. Mechanical Brake (10-2375 Actuators)
NOTE:
Mechanical brake should require no adjusting.
1. Testing and Troubleshooting:
a. Energize actuator for rotation in both open and closed
directions. At the rated actuator voltage, the brake coil is
energized and moves the plunger to release brake arm.
Clearance of .020” to .030” must exist between the brake
arm and the brake disc when power is applied to the
actuator.
b. If the brake arm is too close to the brake disc, realign the
coil housing so that coil plunger can move further toward
the center of the actuator, permitting more movement of
the brake arm.
c. Plunger chattering indicates a low supply voltage. If
actuator voltage is at the rated conditions, realign coil
housing so that coil moves away from the center of the
actuator to reduce plunger movement.
d. All coil adjustment is done in small increments of .015
inches or less.
e. Additional adjustment may be done by moving mounting
plate toward/away from actuator shaft.
f. Once proper operation of the brake is verifi ed replace
actuator cover.
10-23 75 Assembly Shown
Item Qty Description
1
1
Circuit Board
2
1
Mounting Plate
3
5
Spacers (.06”)
4
2
Spacers (.25”)
5
2
Flat Head Screws
6
3
Head Screws
7
3
Nuts
8
1
Insulator
9
3
Cable Ties (Not Shown)
10
1
Potentiometer Kit (Not Shown)
F. Cycle Length Control (CLC Module)
a
CAUTION:
CLC module must be used with proper line voltage.
Control of the actuator’s cycle time is achieved by breaking up the
power applied to the actuator into a series of pulses. The length of
time a power pulse is applied is controlled by the “ON” adjustable
control. The interval between pulses is controlled by the “OFF”
adjustable control.
To adjust, start with both controls at midpoint. To reduce cycle time
on 120 VAC units, turn “ON” control in CW direction and “OFF”
control in CCW direction. To increase cycle time turn “ON” control
in CCW direction and “OFF” in CW direction. To reduce cycle time
on 240 VAC units, turn “ON” control in CCW direction and “OFF”
control in CW direction. To increase cycle time turn “ON” control in
CW direction and “OFF” in CCW direction.
IMPORTANT:
If “ON” time adjustable control is at minimum and/or
“OFF” time adjustable control is at maximum, the actuator will not
rotate. The minimum “ON” pulse must allow the actuator to move a
closed valve out of its seat. Verify proper CLC operation by opening
a fully closed valve.