To Set Close Lmit Switch (Lsc); To Set Intermediate Switch (Lsa Or Lsb); Torque Seated Valves - Emerson EIM 2000 Series Installation And Maintenance Manual

Section 4: Geared Rotary Limit Switch Setting Instructions
August 2017
IMPORTANT:
To insure that spur gears have engaged properly, lightly jiggle all adjusting shafts (1) with
screwdriver back and forth; proper engagement has been made if all shafts will not turn. If
all shafts do not lock in place, the limit switch setting will be lost when valve is moved.
NOTE:
Since many turns may be required to set limit switches, it may be convenient to use a
reversible variable speed drill to rotate Adjusting Shaft (1) instead of screwdriver.
Limit Switch Gear Box is gear driven by the gear limit pinion assembly. The gear limit
pinion is driven by the actuator output worm and is always mechanucally in step with valve
position. N is the total number of turns of spring loaded gear limit pinion assembly for full
valve stroke.
4.3

To set Close Lmit Switch (LSC)

1.
2.
4.4

To set Intermediate Switch (LSA or LSB)

1.
4.5

Torque Seated Valves

If valve is a torque seating valve, and the geared limit contacts are used for pilot light
indication only, the LSC switch should be set several handwheel turns ahead of torque
switch contact action. This gives proper valve position Pilot Lamp indication in spite of
minor position variations which might occur due to torque seating.
12
Close valve, using handwheel. During handwheel operation note direction of LSC
adjusting shaft. After valve is fully Closed, Open it several handwheel turns to
allow for coasting.
Repeat steps 2 through 5 of LSO setting instructions with screwdriver in LSC cavity.
Open Valve to desired position, then repeat steps 2 through 5 of LSO.
Installation and Maintenance Manual
E2K-401-0817 Rev. 1
Geared Rotary Limit Switch Setting Instructions