I'm really stuck with an electronic hoist at work. It's an electric trolley hoist and is held onto a steel girder for moving backwards forwards etc...
What happened was the pendant control panel wire got caught in between the hook and the hoist motor cover (cut off switch control broke off a while back so no limit) and shredded the wires so control from the pedant stopped working.
A workmate (fellow electronic engineer student) had cut the wire down to after the shredded part and rewired it back into place. Now, I dont know where he's gone wrong, He states the time delay fuse T1.25L250V internally kept blowing. So this was replaced with a T1.6A250V but still kept blowing.
I came up with the idea that the motor was drawing a lot of current as it would "think" that there is too much load on as the hook was jammed right up to the motor cover. I took the hook off and magically the fuse stopped blowing but non of the pendant controls work on the input, it just wont move at all.
It's a 415V supply and the transformer drops the voltage to 24V, I've placed a multimeter on the input to the Transformer and its giving ~415V. When I place the + probe to the "24V" output of the transformer I'm getting around 235V
WHY?
Logic tells me as it's stated on the Transformer that it should be 24V output not x10 that.
nothing is working at all, no contactors are flicking over or anything. My diagnosis is that the transformer has broke down, is it just a simple case of getting a new transformer?
It's a 2000KG 3 phase hoist which operates with a 415V input. It has an electric trolley to move back and forth on the girder and has a motor for pulling items up and down. I would assume the control pendant would only (should only) need 24V due to health and safety etc.. but again a multimeter test on the terminals show a similar reading to what the output of the transformer is showing ~235V
PLEASE HELP.
What happened was the pendant control panel wire got caught in between the hook and the hoist motor cover (cut off switch control broke off a while back so no limit) and shredded the wires so control from the pedant stopped working.
A workmate (fellow electronic engineer student) had cut the wire down to after the shredded part and rewired it back into place. Now, I dont know where he's gone wrong, He states the time delay fuse T1.25L250V internally kept blowing. So this was replaced with a T1.6A250V but still kept blowing.
I came up with the idea that the motor was drawing a lot of current as it would "think" that there is too much load on as the hook was jammed right up to the motor cover. I took the hook off and magically the fuse stopped blowing but non of the pendant controls work on the input, it just wont move at all.
It's a 415V supply and the transformer drops the voltage to 24V, I've placed a multimeter on the input to the Transformer and its giving ~415V. When I place the + probe to the "24V" output of the transformer I'm getting around 235V
WHY?
Logic tells me as it's stated on the Transformer that it should be 24V output not x10 that.
nothing is working at all, no contactors are flicking over or anything. My diagnosis is that the transformer has broke down, is it just a simple case of getting a new transformer?
It's a 2000KG 3 phase hoist which operates with a 415V input. It has an electric trolley to move back and forth on the girder and has a motor for pulling items up and down. I would assume the control pendant would only (should only) need 24V due to health and safety etc.. but again a multimeter test on the terminals show a similar reading to what the output of the transformer is showing ~235V
PLEASE HELP.