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How Do I Set the Adjustable Limit Switches on the PA-17?

The PA-17 Heavy Duty Linear Actuator features external adjustable limit switches that let you set custom stop positions anywhere within the stroke — without cutting the stroke short at the factory level.

PA-17 Limit Switch Overview

Unlike standard PA actuators where internal limit switches auto-stop only at the mechanical end of travel, the PA-17 has two externally adjustable cam-operated limit switches. These let you define a custom extend stop and a custom retract stop anywhere within the 2–24" stroke range.

No limit switches on strokes over 24" PA-17 units with stroke lengths greater than 24" do not include adjustable limit switches. For these units, position control requires an external feedback solution such as a separate limit switch mounted to the application structure.

Adjusting the Limit Switch Positions

1. Identify the limit switch body

The limit switches are located on the actuator body, not the rod end. Two micro-switch assemblies sit in slotted tracks on the side of the housing.
 

2. Loosen the set screw

Each switch assembly is held by a small set screw (typically M3). Use an appropriate hex key to loosen it — do not remove it fully.
 

3. Drive to desired stop position

Slowly drive the actuator to the exact position where you want the motor to stop. Have a helper hold this position or mark it with a ruler.
 

4. Slide the switch to the cam

Slide the switch body along its track until the micro-switch lever is just making contact with the actuator's internal cam (you will hear a faint click). Tighten the set screw.
 

5. Test and fine-tune

Cycle the actuator from fully retracted to the new extend stop position. Verify it stops at the right point. Adjust and repeat if needed.
 

Controller Requirement

The PA-17 draws up to 20 A under full load. Its adjustable limit switches require a controller rated for at least 20 A. PA recommends the PA-20 20A Control Box for PA-17 applications. Do not use a standard 5 A control box — it will overheat and may be permanently damaged.