3501 Manual: Curtis

A: You likely have the microswitch version. The extra two wires are for the pedal-up safety interlock. These are often required for CE or ANSI certification.

Plug the pre-wired Molex control harness into the logic pin receptacle. curtis 3501 manual

What is this Curtis 3501 installed on?

Network/Communication Error. Problem with the programmer link or internal memory. A: You likely have the microswitch version

Built-in LED output and compatibility with Curtis handheld programmers. 2. Wiring and Pin Configurations curtis 3501 manual

The internal circuit that pulls down the main contactor coil is experiencing an overcurrent or an open circuit.

Always install an inline fuse (typically 0.5A to 2A) on the Pin 1 (V+) line to protect the internal circuitry.