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Waukesha Cherry-Burrell
Figure 24: Switch Adjustment
Figure 25: Valve Open Adjustment
Figure 26: Valve Closed Adjustment
August 2008
Switch Adjustment
W-series Control Modules with proximity switches or micro-switches utilize a
positive switching configuration to provide discrete inputs for each valve posi-
tion.
Lower Switch 1 is normally closed (NC) and passing power when the stem is
down. When the stem raises, switch 1 opens and the power is stopped.
Upper Switch 2 is normally open (NO) and does not pass power when the stem is
down. When the stem is fully raised, Upper Switch 2 closes and passes power.
Proximity switches are supplied with incorporated LED's which light when the
power is passed and are inactive when the power is stopped.
1.
Raise the stem to open, then loosen the cap screws holding the switch blocks
(Figure 24, item A) with a 9/64" allen wrench and slide the switches to set
the distance between the switches and the stem shaft at 0.040" (1 mm). If
using a micro-switch, place a 0.020" feeler gauge between the roller and the
small diameter of the stem. Adjust the switch toward the stem until a "click"
is heard.
2.
Hand-tighten the cap screws (Figure 24, item A) to hold the switch position.
3.
With the stem raised, adjust the vertical height of the upper switch target to
slightly below the stem shoulder (Figure 25). Tighten the cap screws
securely.
4.
Lower the stem to close the valve and adjust the target of the lower switch to
slightly above the stem shoulder (Figure 26). Tighten the cap screws
securely.
NOTE: Switches should detect stem movement within 1/16 inch
(0.062 in/1.58 mm)
CAUTION: Do not over-tighten.
NOTE: In this manual, "stem-raised" is understood to be when the valve stem is
fully retracted into the actuator. "Stem-lowered" is understood to be when the
valve stem is fully extended out from the actuator.
95-03076
Maintenance
Page 23
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