[rtkracht]

My question involves connecting the hydraulic unit for an automotive lift (BendPak) in my garage. The motor is 220V/Single Phase/2.2Kw. The instructions that came with the unit are pretty sparse but as best as I can interpret... There is a safey limit switch on the top of the lift that I believe should be wired in series with just 1 of the hot leads from the breaker. This just doesn't seem correct. All my past experience with a switch and a 220V motor has involved breaking both legs of the circuit. Has anybody had experience with this? Hook-up seems simple (2 screwed connections on a terminal block) but it just doesn't seem right. Comments Please...

[Stratmando]

Since the Motor needs to go both directions, probaby going through some type of reversing contactor(usually 2 3 or 4 poles, controlled by 24 Volt transformer, contactor would have 24 volt coils, a Single pole double throw switch, with center off, controls up or down, 2 of the control wires are what you want to interrupt with limits. Can have an up and a down limit, if desired. The limit switch would be normally closed, when limit is reached, up contactor will deenergize.

[rtkracht]

Stratmondo, thanks for the quick response but the motor goes in only one direction. To lower the vehicle there is a hydraulic valve to bleed the fluid out of the cylinders.

[Stratmando]

Removing 1 leg for limit is no problem, releasing of lever will then more likely remove power from both sides. Be sure limit switch will handle current of motor.