Hoist brake solenoid buzzes/fluckers instead of steadily pulling

Ignoramus22978 · 2011-11-13T14:00:33+00:00

I have a 3 phase Yale 1/2 ton hoist. It has an electric brake with asolenoid, whose job is to pull away the brake lever when 230VAC issupplied to it.The problem is that it does not do it. Instead of steadily pullingaway, it constantly jerks the lever, but never far enough to the endpoint where it is supposed to be pulled away. So, the brake is notdisengaged as the hoist operates. I am glad that I noticed that. I tried pulling on the lever by hand when the solenoid was engaged. Inoticed that if I help the solenoid and pull away the lever to theend, jerking stops completely, but if I slowly let go of the lever andit returns to the brake position, jerking resumes. I am thinking that perhaps this solenoid has two separate coils,pulling and holding one, and the holding one is not working or notengaging?Any idea?thanks

Nov 13, 2011 22 Replies

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hrhofmann 14 years ago

Has the OP ever said if there are two or three or how many wires going to the solenoid????

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Jamie 14 years ago

From what I can remember, it's a simple 2 wire solenoid.. That being the case, they should be connected to the # 1 & 2 wires of the motor relay output side M1,M2. If it was wired for 480, then the coil is connected to the #4 and #5 for example. That will get half the voltage when the motor operates. Standard for AC motors with add on brake on the back..

Jamie

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Cydrome Leader 14 years ago

Not sure about the flamewar going on here, but it's actually not hard to get a LED to change colors. Get some liquid nitrogen and try it out.

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