LMAIM1501
LY Installation and Maintenance for LY 1001, LY 2001 and LY 3001
5-7
5.6
Limit Switch and Mechanical Stop Settings
The Limit Switch and Mechanical Stops are not preset at the factory, but must be set after mounting on the
associated equipment. If the actuator has been shipped already installed on a valve, the actuator should have the
Limit Switch and Mechanical Stops set for your application. If the actuator is not already installed on a valve or
needs resetting, use the following instructions to make the appropriate settings.
The following instructions for setting the Limit Switches and Mechanical Stops are based on the typical orientation
for most actuator applications. Consult the applicable wiring diagram located in the Control Compartment for the
specific Limit Switch development.
NOTE: While making Limit Switch settings, remember that the Limit Cams rotate in the same direction as the valve
stem.
5.7
Setting the Limit Switches
a
WARNING: Do not manually operate actuator with devices other than installed Handwheel and Declutch
Lever. Using additive force devices (cheater bars, wheel wrenches, pipe wrenches or other devices of this
nature) on the actuator Handwheel or Declutch Lever may cause serious personal injury and/or damage to the
actuator or valve.
a
DANGER: HAZARDOUS VOLTAGE. Make sure all power is disconnected before making the following settings.
5.7.1
Setting the CLOSED Limit Switch
1.
Put the actuator in MANUAL operation: move the Declutch Lever in the direction of the arrow on the lever until
the Declutch Lever locks in place. If Declutch Lever is difficult to move, see Section 6.4, Manual Operation for
instructions to release the Declutch Lever.
2.
Turn the Handwheel CW to move the valve to the full CLOSE position.
NOTE: Most applications require turning the Handwheel CW to obtain the full CLOSE position and CCW to
obtain full OPEN position. The Drive Sleeves and Limit Cams also rotate in CW rotation to the CLOSE position
and CCW to the OPEN position. If the application is configured differently, the descriptions in this manual will
describe rotation directions opposite your application.
3.
Loosen Setting Nut (piece #7-10) located at the top of the switch bracket approximately 3/4 turn.
NOTE: When setting the Limit Cams by rotating to the trip point as described in Step 4, be careful not to move
more than one cam at a time. Limit Cams that have already been set are not secure until Setting Nut (piece #7-
10) is retightened.
Flow Control Division
Limitorque Actuation Systems
