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  1. #1

    Hitachi HT20 Alarms

    Looking for a starting point with a Hitachi HT20. At start up I'm getting alarms.

    392 Z-axis Disconnect
    390 Servo Pack Alarm
    310 Power for servo not supplied

    It will allow me to hit the standby button but about 2 seconds later it kicks out and then nothing works.

    Any help would be appreciated.

  2. #2

    Re: Hitachi HT20 Alarms

    The problem seems from Z axis driver, check its cables, connectors, or the driver might be broken.
    http://cncmakers.com/cnc/controllers/CNC_Controller_System/CNC_Retrofit_Package.html

  3. #3

    Re: Hitachi HT20 Alarms

    Thankyou for the response I will start with getting those checked out.

  4. #4
    Join Date
    Jan 2013
    Posts
    474
    Quote Originally Posted by JSMachining View Post
    Looking for a starting point with a Hitachi HT20. At start up I'm getting alarms.

    392 Z-axis Disconnect
    390 Servo Pack Alarm
    310 Power for servo not supplied

    It will allow me to hit the standby button but about 2 seconds later it kicks out and then nothing works.

    Any help would be appreciated.
    After doing the checks recommended by the previous poster, power down machine, lock it off and remove the drive. Take it to your nearest specialist drive repair center (Fanuc?).

    If it were X or Y axis you could swap them to see if the fault moved with the drive.

    Z axis is usually a bigger more powerful drive and on a vertical machine often has a brake circuit. (Probably not in your case).

    I suspect drive transistor fault or power supply.

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