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Answered Alarms: Deadman switch abnormal & chain failure

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Ezequielo Murillo

Hi Guys,

My Fanuc 120iBe RJ3 out of no where started showing some alarms:

SRVO-248 Deadman switch abnormal Status.

SRVO-236 Chain failure

This is the sequence: the first alarm comes every time Deadman is pressed. If the deadman is released the second one comes up. We have tried troubleshooting by checking the Estop fuses, TP Switches, TP & controller cable. We have also tried reset option but all in vain!

Need your help Guys!

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4 comments

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    Masako Cynesige
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    Hi,

    You have already checked most of the things, I would suggest you to check one more thing here, Relay connected to the deadman swtich, the Panel Board RELAY located behind the controller door. Check its function while pressing the switch. 

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    Losev Radinovich
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    Ezequielo Murillo

    As you stated , You have started troubleshooting with  TP Cable , E-stop , E-stop unit, E-stop fuses. So , I believe there is a hardware issue on the teach pendant . If you have a another good teach pendant , Verify with it. 

    At last , You will require to change the Teach pendant / Teach pendant board. 

     

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  • Avatar
    Masako Cynesige
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    If the relay is also fine, then it seems like an electrical issue with your pendant's Main board, you can verify by connecting a good pendant if available.

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    Ezequielo Murillo
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    Thanks for your responses.

    The problem resolves if we use another robot's tp.

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