Mitsubishi Electric MR-J2-03B5, Instruction Manual

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8 - 2
8. TROUBLESHOOTING
8.2 Remedies for alarms
CAUTION
When any alarm has occurred, eliminate its cause, ensure safety, then reset the
alarm, and restart operation. Otherwise, injury may occur.
POINT
When any of the following alarms has occurred, always remove its cause
and allow about 15 minutes for cooling before resuming operation. If
operation is resumed by switching control circuit power off, then on to
reset the alarm, the servo amplifier and servo motor may become faulty.
To protect the main circuit elements, any of these servo alarms cannot be
deactivated from the servo system controller until the specified time
elapses after its occurrence. Judging the load changing condition until the
alarm occurs, the servo amplifier calculates this specified time
automatically.
Overload 1 (50)
Overload 2 (51)
The alarm can be deactivated by switching power off, then on or by the
error reset command or CPU reset command from the servo system
controller. (For details, refer to Section 8.1.)
When an alarm occurs, the dynamic brake is operated to stop the servomotor. At this time, the display
indicates the alarm No.
The servo motor comes to a stop. Remove the cause of the alarm in accordance with this section. The
optional servo configuration software may be used to refer to the cause.
Display Name Definition Cause Action
1. Power supply voltage is low.
2. There was an instantaneous
control circuit power failure of
40ms or longer.
3. Shortage of power supply capacity
caused the power supply voltage to
drop at start, etc.
4. Power was restored after the bus
voltage had dropped to 15VDC.
(Main circuit power switched on
within 5s after it had switched off.)
Review the power supply. 10 Undervoltage Power supply
voltage dropped to
20VDC or less
5. Faulty parts in the servo amplifier
Checking method
Alarm (10) occurs if power is
switched on after CN1A, CN1B,
CNP2, and CNP3 connectors
are disconnected.
Change the servo amplifier.
11 Board error 1 Printed board fault
12 Memory error 1 RAM, ROM memory
fault
13 Clock error Printed board fault
Faulty parts in the servo amplifier
Checking method
Alarm (any of 11 to 13)
occurs if power is switched on
after disconnection of all cables
but the control circuit power
supply cables.
Change the servo amplifier.