Product Overview

Valve

For valve assembly details refer to AV-600, Valve Linkage Kit General Instructions,

F-26279 or AV-601, Linkage Extension Kit General Instructions, F-26280. Refer to

Figure-21 for external dimensions of the valve actuator.

Adjustments Auxiliary Switch (MA-5xxx-500)

The switching point is adjustable over the entire actuator stroke and is pre-set at the factory

to close the N.C. contacts at the retracted end of stroke. Turning the switch adjustment

screw CW (using TOOL-12), adjusts the make (or break) point closer to the extended end

of stroke. (Refer to Figure-15).

Figure-15 Auxiliary Switch Actuation Point Adjustment and

Position Indication for MA-5xxx-500 Series.

CHECKOUT

After the entire system has been installed and the actuator has been powered up, perform

the following checks for proper system operation.

Caution:

Never power the actuator without a spring return linkage attached.

Positioning with

Controller

If the sensed media is within the controller’s setpoint range, the actuator can be positioned

by adjusting the controller setpoint up and down. Check for correct operation of the actuator

(valve or damper) while the actuator is being stroked.

Go, No-Go Test 1. Apply power to the actuator. The actuator motor should run and the actuator shaft should

extend.

2. Remove power from the actuator. The actuator motor should stop running and the

actuator shaft should spring-return to the retracted position.

Position Indication and

Switch Action Cam

Auxiliary Switch

Adjustment Screw

MA-52XX-500

Series