Flowserve LY Series Limitorque - Manual (Page 18)

Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11
18
5.5 Torque Switch Settings
c WARNING: HAZARDOUS VOLTAGE. Turn power OFF before opening the Electrical Compartment
Cover or making any adjustments to the Torque Switch.
a CAUTION: Installing or adjusting the Torque Switch with the actuator in a loaded condition will
result in loss of torque protection. Before adjusting or installing the Torque Switch, place the
actuator in MANUAL mode and turn the Handwheel in the direction necessary to release the
torque load on the Wormshaft Assembly.
NOTE: Removal or modification of the Torque Switch Limiter Plate will void the actuator warranty.
Do not exceed the torque setting indicated by the Torque Switch Limiter Plate without contacting the
Limitorque Service Department.
The LY unit is equipped with a do W to MEDIUM or HIGH by adjusting the Torque Switch Adjustment
Screw unless it is limited by the Limiter Plate. (See Figure 5.6 for Torque Switch Adjustment Screw
location.)
5.6 Rewiring the Torque Switch for Non-Standard
Drive Sleeve Rotation
a CAUTION: Double-check the wiring diagram to verify that the Torque Switch is wired appro-
priately for the application. The Torque Switch will not protect the valve from over-torque if the
Torque Switch is not wired properly for the application.
LY series actuators are typically supplied with a CCW Drive Sleeve rotation to open a valve. The Torque
Switch is marked OPEN (CCW) and CLOSE (CW) based upon CW Drive Sleeve rotation to close the
valve. The Mechanical Dial Position Indicator (MDPI) is typically mounted for CW rotation to indicate
the CLOSED position. If opposite Drive Sleeve rotation is required (CCW to close a valve), the following
Torque Switch modifications are required.
1. Turn all power to the actuator OFF.
2. Reverse the ID Limiter Plate.
3. Interchange OPEN Torque Switch wires 18 and 18C with CLOSED wires 17 and 17C. (Refer to the
wiring diagram for other Torque Switch wiring configurations.)
Figure 5.6 – Reversing Torque Switch Wiring
LY-1
H
M
L
HM L
CLOSE
OPEN Typical CLOSE-circuit
microswitch (17 &17C)
Typical OPEN-circuit
microswitch (18 &18C)
ID-Limiter Plate
Torque Switch
Adjustment Screws