Imran
No, the contactor is in circuit with both Live and Neutral. ?However, if you look at the diagram, you will see that the incoming power is T¡¯d off on the supply side of the contactor (1 and 3 on the RH half of the contactor (6)) and then feed the brake board. ?When the contactor is in the OFF position, the timed DC from the brake board is fed into 21 on the RH half of the contactor, via the closed contact and thence to the motor. ? I¡¯m pretty sure that temporarily disconnecting that wire between brake board and 21will stop the planer motor buzzing. ?
But, Annu, if you do do this then make sure you¡¯re undoing the correct wire and keep your fingers away!
This is the ONLY way power gets through without the ON button being pressed. ?The brake boards are faulty. I rest my case !
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Roger,
If the contactor on Annu¡¯s machine only switches one of the hot power legs then what he has shared is totally possible because the short is to ground. As soon as powers gets to the motor there will be high current. This current won¡¯t be seen by the off contactor as it is not going thru it. I am not sure if his machine has a current limit on the contactor.
Imran
On Jan 15, 2021, at 5:06 AM, Roger S <
rsinden@...> wrote:
?
Hi Annu
I still remain unconvinced that your planer motor is faulty. ?You have two faulty brake boards. ? I had exactly the same problem with my machine (although it¡¯s 3 phase and not single like yours). ?
When I removed the fuse on my brake board, the problem went away. ?Hence my suggestion to you to do the same. ?However, if the fault on your brake boards are different to that on mine then simp,y removing the fuse wont have the same result on your machine.
Therefore you need to bypass that brake board. ?
Roger
hey Imran,?
Here are the various combinations of things that happen.??
When all the motors are plugged in:
1. If I have the mode switch in the planer position and then turn on the circuit breaker, the planer makes a racket and surges back and forth without me touching the start button.
1a. If I lift up the planer table so that the limit switch is open, have the mode switch in the planer position, and then turn on the circuit breaker, the planer makes a humming noise without me touching the start button.
2. If I put the mode switch in table saw or shaper, have all the limit switches in the closed position, and turn on the circuit breaker, planer still makes a humming noise.
3.? I tried with the planer motor disconnected.? When the circuit breaker is turned on, there is no noise at all, confirming that the humming from #2 was comming from the planer motor.? If I push the on button in either table saw or shaper mode, their respective motors start making a humming noise
When i talk about the limit switches, i'm talking about the one on the shaper door and the one under the planer table.? Open means that it is not in the run position and closed that it is in the run poisition.? I made sure that the one on the shaper door was in the middle position.? the E-Stop was pulled out in all scenarios above.? The humming noise is the same as when i used the turn off the machine previously and the e-brake was engaged.
Could it be that the position switch is not working correctly since there is some power going to the planer motor if it is plugged in and I turn on the circuit breaker?
Thanks,?
Annu
