User Manual

Worcester Actuation Systems Series 75 Electric Valve Actuator FCD WCAIM2013-01 - 08/04
10
25 and 3075
10-2375
Typical Top View
Item Description
1
Extra Switch
2
#4-40 Screws (2)
3
Extra Cam
4
Set Screw (1)
5
Spacers (25/3075 Only)
6
Spacers (two per Switch)
7
Insulator
C. I-75 Interface
1. Description:
The I-75 Interface is designed to be used and mounted in the
Series 75 Actuator as one of many standard options. Func-
tion of the I-75 Interface is to allow the Series 75 Actuator
to be powered by a 120 or 240 VAC power supply, operated
directly by any programmable controller, microprocessor,
and/or computer regardless of output rating of these devices.
Depending on the control input used there are several options
of the I-75 Interface:
5V for 5 VDC input, XV for 12 VDC input, XX for 24 VDC input,
15 for 120 VAC input.
These options are identifi ed by the nameplate on the circuit
board.
2. Indication and Repair:
LED Indicators – Light emitting diodes marked LD1, LD2 are
in input circuits and indicating what particular input is on. Left,
LD2, LED indicates that CCW, open, signal is on. Right, LD1,
LED indicates that CW, close, signal is on.
If a malfunction occurs, look for the following:
If particular input is energized and corresponding LED light is
not on, check for component damage or other continuity disrup-
tion in corresponding CCW and/or CW input circuit. If everything
appears to be OK, replace matching opto-coupler U2 or U1.
Input circuit is OK. LED is lighted and actuator is not running.
If components and continuity in corresponding power circuit
are all right, then failed component is triac Q2 or Q1 depending
which way the actuator doesn’t run, CCW or CW.
If the actuator doesn’t run in either direction, it is likely that
the actuator is defective. To check this, remove the red and
black leads from terminals 3 and 4 of the actuator (coming
from Interface board) and the AC line connections from
terminals 1 and 2. Tape these leads. Using a test cable, apply
power to actuator terminals 1 and 3. The 120 VAC actuator
only (see Note) should rotate CCW until stopped by the CCW
limit switch. Then apply power to terminals 1 and 4 to check
CW 120 VAC actuator and the CW limit switch. If the actuator
does not operate, check 120 VAC associated wiring, terminal
strip, the limit switches, motor, and capacitor. Check switch
continuity. Check for an open motor winding, and check for a
shorted capacitor. If the problem in the actuator still cannot be
determined, return the unit for service. If the actuator functions
properly, the problem is in interface board.
Request an RMA (Return Material Authorization) number
from the service department, replace the defective board, and
return it to the factory with proper description of problem and
application.
NOTE:
The limit switches for the 240 VAC I-75 actuator do not
control the motor circuit, they control input circuit only. When
applying power to terminals 1 and 3, and 1 and 4 to check
CCW, CW rotations, do this momentarily so that you do not
override 0-90° quadrant.