User Manual

5
Worcester Actuation Systems Series 75 Electric Valve Actuator FCD WCAIM2013-01 - 08/04
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six screws are in an envelope and inside the cover) and lift cover
from unit.
25-3075 Z
Remove indicator knob capscrew with Allen wrench
and lift knob from shaft. Remove the cover screws and lift cover
from unit.
B. Make conduit connection to NPT fi tting on actuator base. Connect
power supply to actuator terminal strip as shown on electrical
schematic diagram(s) located inside actuator cover and also in this
manual.
The actuator should be electrically grounded in accordance with
standard procedures.
For 10-2375 W, X and Z actuators, connect a CSA certifi ed No. 18
AWG green-colored grounding wire to the green-colored grounding
screw on actuator base.
For 10-2275 GP actuators, connect a CSA certifi ed No. 18 AWG
green-colored grounding wire to terminal marked “G” on actuator
terminal strip.
For 25 and 3075 Z actuators, connect a CSA certifi ed No. 18 AWG
green-colored grounding wire with a ring-type crimp wire connector
and a washer to the green-colored grounding screw (near terminal
strip) marked with a letter “G” on motor support plate.
See table below for minimum fuse rating when overcurrent protec-
tion is used in motor power circuit.
a
CAUTION:
In cases where the conduit connected to the
actuator may be partially or completely run underground,
or through which moisture may contact energized live
parts, or where the actuator and/or conduit is exposed
to temperature differences, the conduit should be sealed
within 18" of the actuator in accordance with the National
Electrical Code.
Minimum Fuse Rating for Overcurrent Protection
Actuator Size Voltage Fuse Rating (A)
10-23
120 VAC
5A
25/30
120 VAC
10A
10-23
240 VAC
3A
25/30
240 VAC
5A
10-23
12 VDC
10A
10-23
24 VDC
5A
NOTE: The table shows the minimum rating to prevent inrush
current from blowing the fuse.
C. When electrical installation is complete, it is advisable to check the
indexing of the actuator before replacing the cover.
10-3075 (All): Move actuator to “Open” position (apply power to
Terminals 1 and 3). If it does not fully open, or turns past open
position, unfasten cam of switch SW2 by loosening set screw (SW2
is to the left of the shaft looking from terminal strip). Move actuator
to correct position. Adjust cam so that it just throws micro switch
in this position. Tighten set screw and recheck indexing. Repeat this
procedure for “Closed” position (apply power to Terminals 1 and
4). WARNING: Do not bend switch arms when adjusting cams for
actuator travel limits. Doing so will damage the cams.
NOTE:
If one or more of the options listed in Options and Adjust-
ments Section have been installed, follow specifi c instructions for
those options as necessary before replacing cover.
D. If actuator has been cross-line mounted and valve is a diverter or
three-way with V-1 porting or CPT valve, proceed as follows:
Reset both cams to operate in next quadrant, (when looking down
at cover, the “next” quadrant is 90° clockwise from standard
quadrant, one quadrant closer to conduit connection). Switch #1 is
the “to close” switch, and is connected to Terminal #4. Switch #2 is
“to open”, goes to Terminal #3. CPT valves must operate “clockwise
to close” viewed from top. Relocate decals to new quadrant. “Open”
is 90° from conduit side, “close” is adjacent to conduit side. If
mounted on a V-1 diverter, “open” shall expose ball port at one pipe
end, “closed” shall expose ball port at the opposite pipe end.
E. Replace actuator cover.
NOTE:
For W and Z models, make sure fl ange gasket/seal is
properly installed. Tighten all cap screws securely.
For X and Z Models Only:
After placing the cover on the actuator, tighten the cover bolts in a
crisscross fashion to a torque of 70-80 in-lbs.
A feeler gage, being
1
⁄
1
⁄
1
8
⁄8⁄
" to ½" wide and 0.0015" thick, shall be used
to check the clearance between the base and cover fl ange.
This feeler gage shall not penetrate the base/cover fl ange gap any
more than
1
⁄
1
⁄
1
8
⁄8⁄
".
10-2375 W, X and Z: Replace declutching knob, taking care that
knob set screw engages milled fl at on clutch shaft and indicates
proper position on labeled cover.
25-3075 Z: Replace indicator knob in its proper position to give
correct indication. Tighten indicator’s cap screw securely.