Alarm 157 Mocon Watchdog Fault on VF-0E

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12-08-2011, 12:32 PM
hoi.le

Alarm 157 Mocon Watchdog Fault on VF-0E

Anybody got alarm 157 Mocon Watchdog Fault before?

I can't Reset that alarm when turn on the machine.

I try replace a new mocon board from Haas by myself. But it still got alarm 157.

I see on manual,

Quote:

Alarm 157: The self-test of the MOCON has failed. Test +12, -12, and +5 volt power at MOCON PCB. Unreliable power from LVPS can cause this alarm. Check alarmhistory for Axis Drive Faults. Afaulty axis driver can cause fluctuated or imbalanced low volt power to logic stack. Problem may be caused by a shorted coolant level sensor, voltage sensor from vector drive, or thermocouple sensor from X-axis ballscrew (lathe). Disconnecting cables, one at a time, on P34, P26, , P27, P28, P17, P21, and P22, may isolate the problem.

I checked power from LVPS is ok.

Pls help if you have any ideas about this alarm.

Thanks & Regards,
12-09-2011, 08:59 AM
hoi.le

Anybody help!!!
12-09-2011, 11:42 PM
KenFoulks

You said the LVPS was ok, what was the value? You can adjust the potentiometer on the LVPS PCB to tune in the correct voltage or have the LVPS replaced.
12-15-2011, 05:04 AM
hoi.le

Quote:

Originally Posted by KenFoulks

You said the LVPS was ok, what was the value? You can adjust the potentiometer on the LVPS PCB to tune in the correct voltage or have the LVPS replaced.

Den KenFoulks,

Thank you, very good advice!!! I need adjust the potentiometer of LVPS.

Thanks,