Limit Switch Information - FSMS/VSMS
Fixed Speed Motor Starter (FSMS) and Variable Speed Motor Starter (VSMS) ship with 4 independent normally closed limit switch inputs:
- Upper Overtravel
- Upper Limit
- Lower Limit
- Lower Overtravel
The Upper Limit will prevent the connected hoist from traveling in the up direction, but allow the hoist to travel in the down direction. The Lower Limit prevents the connected hoist from traveling in the down direction, but allows the hoist to travel in the up direction.
The Upper Overtravel and Lower Overtravel will bring the hoist to a complete stop and disengage the e-stop contactor in the FSMS/VSMS, preventing any additional hoist movement. Please contact ETC Technical Services for additional information.
Limit Switch Wiring
The limit wiring for FSMS and VSMS are identical. In the FSMS/VSMS Enclosure or Breakout Terminal Enclosure, the limit switch wiring is generally the first four dual level terminals. In FSMS and VSMS the upper/center terminal (A) is always the voltage output and the lower terminal (B) is the return signal.
The left hand diagram below shows the terminals as they ship, with a factory jumper installed between the A and B terminal for each limit, the factory jumper should be removed prior to terminating field wiring. The right hand diagram below shows a typical limit switch assembly wired to the terminals.
Note: FSMS & VSMS are not compatible with normally open (closed when struck) limit switches.