User Guide

WIRING

AM-321, AM-341 and AM-342 accessory kits must be connected to Class 1 circuits unless

all circuits are powered from a Class 2 circuit. Make all electrical connections in accordance

with the job wiring diagram and in compliance with national and local electrical codes.

ADJUSTMENTS

Auxiliary Switch Adjustment

Accessory kits AM-321 and AM-342 each contain two SPDT, snap-acting auxiliary switches.

Accessory kit AM-341 contains four such switches. All switches are independently adjusted

to operate at any point in the actuator stroke. Large screw-type terminals, marked “C,” “B,”

and “R,” are provided for connections. The terminals marked “C” are common for each

SPDT switch, and those marked “B” and “R” are the contact terminals. On CW rotation of

the actuator, the “B” contact closes. On CCW rotation of the actuator, the “R” contact closes.

Refer to Figure-1 for an internal view of an AM-342 accessory kit showing the features of an

auxiliary switch assembly.

Set the operating points of the auxiliary switches as follows:

1. With the accessory kit mounted onto the actuator, run the actuator CCW to the end of its

travel. Refer to the diagram on the underside of the actuator cover and/or the actuator

instruction sheet.

2. Using a wrench, turn the black cam CW or the white cam CCW (as determined when

viewing the actuator output shaft), until both cams move simultaneously. This provides

the minimum switch differential of approximately 9°.

3. Turn the black cam CW until the depression in the cam is at the point on the scale where

the switch is to make “B” the upper contact. Both cams should move when the black

cam is turned.

4. If the minimum switch differential is required, the switch adjustment is now completed.

5. If a setting other than the minimum differential is required, turn the white cam CW until

its lobe is at the desired position on the scale, where the switch is to make “R” the lower

contact.

6. Run the actuator through its entire travel to verify the switch settings.

Figure-1 Internal Features of AM-342 Accessory Kit.

Potentiometer

Slidewire

Wiper Arm

Terminal Screw

Potentiometer

Terminal Screw

Potentiometer Base

Auxiliary

Switch Cams

Auxiliary

Switch Assembl

Auxiliary Switch

Terminal Screws

“E” Ring

Wiper Arm