45 EMERGENCY STOP Alarm in the middle of machining

[Karsue]

Hi,
I have a Mazak H500-M32 and recently in the middle of machining and by the moment of picking-up the tool from magezine or puting it back the tool in to the magazine by shifter, the alarm 45 Emergency Stop appears on screen and there is a LED (Red Color) turns on, on the controller's power supply PD21B.
By disconnecting OL wires and turn on the controller then turn it off and connect OL again, then I will be able to run the machine just for a few moments before taking off or putting back the holders in to the magazine by Shifter.
I check every thing and replace many items with another one from simmilar machine, but still the problem is there.
Is there any thought or information regarding this??? I appreciate in advance any information.

[jet@w&s]

sounds like your 24vlt circuit(E-STOP)... is being pulled down when your shifter is moving.... shorted wiring or prox switch in that general area would be my guess.... hope it points you in the right direction... I would check your power supply when it is in the alarm status it should be pulled down which will trigger your E-Stop condition.Get your machine back in a state that releases it from E-stop and your voltage at power supply should be back... Thru Manual control step your tool change thru the motions of a change until your alarm pops up and that should give you a clue of what is causing your short....