Flowserve L120-85 Actuator - Manual (Page 17)

4.5.2 Adjustment—General
Tools required:
• The cross-slotted Intermediate Shafts A, B, C and D have been
designed for use with a 6" No. 2 Phillips screw driver shank
chucked into a variable speed reversible electric drill. (See figure 9
for Limit Switch components).
• Phillips Head or Flat Head screwdriver.
c WARNING: Potential Explosion Hazard. Do not use a vari-
able speed reversible electric drill for setting the Limit
Switch in an explosive environment.
a CAUTION: When setting Limit Switch Rotor Cams using a
variable speed reversible electric drill, Do Not run drill at
speeds higher than 200 RPM. Operating drill at high speeds
can cause damage to gearing within the Limit Switch.
a CAUTION: The Worm on the Worm Shaft Assembly is avail-
able in two different ratios 19:1 and 38:1. To avoid damage
to the gearing mechanisms, be sure you change the Limit
Switch Drive Pinion gear if the Worm gear ratio is changed.
NOTE: The Limit Switch is available with a 4 Gear Set or a 5 Gear
Set within the Gear Frame Assembly. The number of Gear Sets
built into your specific Limit Switch will determine the number
of maximum Drive Sleeve rotations required to go the full range
of the Limit Switch. A four Gear Set with 19:1 and 38:1 has a
maximum rotation of 902.25 Drive Sleeve rotations. A five Gear
Set with 19:1 and 38:1 has a maximum rotation of 9022.5 Drive
Sleeve rotations.
Figure 9: L120-85 Limit Switch Components
Gear Frame
Assembly
Intermediate Shafts
(A, B, C, and D)
Drive Pinion
Clutch Screw
Rotor Cams
4.5.3 Setting the OPEN Limit Switch
1. De-engerize electrical circuit to the actuator.
2. Open Electrical Compartment Cover (piece 200-1).
3. Put the actuator into MANUAL operation by moving the Declutch
Lever in the direction of the arrow on the lever until the Declutch
Lever locks in place.
4. Turn the Handwheel CCW to move the valve to the full
OPEN position. While turning the Handwheel, note the direction
of the Intermediate Shaft that corresponds to the Open Rotor
Group. See figure 9.
NOTE: Most applications require turning the Handwheel CW to
obtain the full CLOSE position and CCW to obtain full OPEN
position. The actuator Drive Sleeve rotates in a CW direction
to the CLOSE position and CCW to the OPEN position. The
Limit Switch Intermediate Shafts rotate in a CCW direction
to the CLOSE position and CW to the OPEN position. If your
application is configured differently, keep in mind that the descrip-
tions in this manual will describe rotation directions opposite of your
application.
5. Once the valve is fully OPEN, turn the Handwheel back toward
CLOSE approximately one full turn. This will allow for coasting
during motor operation.
a CAUTION: Do not operate the actuator when the Clutch
Screw is in a fully depressed position; loss of the contact
setting will occur and the Setting Rod will be damaged.
a CAUTION: For highly geared actuators, one turn of the
handwheel may not be sufficient to allow for coast of mov-
ing parts. Refer to valve manufacturer setting requirements
in these cases.
6. Push in Clutch Screw and turn CW one quarter turn to
latch in a depressed position.
7. Limit Switch Rotor Cams
A. If your Limit Switch Rotor Cams did not trip at the full
OPEN position point, turn the Intermediate Open Shaft in a
CW
direction until the Open Limit Rotor Cam rotates
90° to make an OPEN contact (OPEN limit trip point = Rotor
Cam in a vertical orientation to make an OPEN contact);
see figure 10 for orientation. Once you have reached the
full OPEN position point, use the Handwheel to rotate the
Intermediate Shaft slowly in the CCW
direction until
the Rotor just trips again.
B. If your Limit Switch Rotor Cams did trip before reaching
the full OPEN position point, leave the valve at the full OPEN
1
Limitorque L120-85 Installation, Operation and Maintenance FCD LMENIM1202-00 – 11/05
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