Mar 2013
Installation and Maintenance
Part Number: E2K-402-0313, Rev. A
12
Section 4: Limit Switch Setting Instructions
Limit Switch Setting Instructions
4.4
TORQUE SEATED VALVES
If valve is a torque seated valve, and the geared limit contacts are used for indication only,
the LSC switch should be set several handwheel turns ahead of torque switch contact
action. This gives proper valve position lamp indication in spite of minor position variations
which might occur due to torque seating.
4.5
TORQUE SWITCH CALIBRATION
Figure 9
To set Close Torque Switch (TSC):
a)
Close valve using handwheel. Set valve to the desired torque. Observe rotating dial
for number that corresponds to desired Close Torque.
b)
Insert screwdriver in TSC slot. Press down to disengage and turn arrow to setting
determined in a). Release at this point and it will re-engage and remain set.
c)
Back the valve away from Close position and reseat by handwheel to verify torque
trip point is at desired setting. The trip point of switch is a distinctive click as it
breaks contact.
DANGER
REVERSE POWER VOLTAGE PHAS ING REMOVES TORQUE SWITCH PROTEC-
TION FROM THE REVERSING CONTACTOR COIL CIRCUITS. VALVE DAMAGE
COULD OCCUR.
If phasing has not been checked, do so before proceeding. Back
valve away from Close position with handwheel and test torque electrically, using
Close controls. Readjust as required.