Remedies For Alarms - Mitsubishi Electric MR-J2M-P8B Instruction Manual

9. TROUBLESHOOTING

9.2 Remedies for alarms

CAUTION
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 MR Configurator (servo configuration software) may be used to refer to the
cause.
@ in the Indication field denotes the slot number of the base unit and # the axis number of the drive unit.
Display
Name
IFU DRU
FA.10 Undervoltage
FA.12 Memory error 1 RAM, memory fault
FA.13 Clock error
FA.14 Watchdog
FA.15 Memory error 2 EEP-ROM fault
When any alarm has occurred, eliminate its cause, ensure safety, then reset the
alarm, and restart operation. Otherwise, injury may occur.
If an absolute position erase (A.25) occurred, always make home position setting
again. Otherwise, misoperation may occur.
As soon as an alarm occurs, make the Servo off status and interrupt the main
circuit power.
POINT
When any of the following alarms has occurred, always remove its cause
and allow about 30 minutes for cooling before resuming operation. If
operation is resumed by switching control circuit power off, then on to reset
the alarm, each unit 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.
Regenerative error (A.30)
Overload 1 (A.50)
The alarm can be deactivated by switching power off, then on or by the
error reset command CPU reset from the servo system controller. For
details, refer to Section 9.1.
Definition
Power supply voltage
fell to or below 160VAC.
Printed board fault.
CPU/parts fault
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Overload 2 (A.51)
Multi axis overload (A.53)
Cause
1. Power supply voltage is low.
2. There was an instantaneous control
circuit power failure of 30ms 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 200VDC.
(Main circuit power switched on
within 5s after it had switched off.)
5. Faulty parts in the base unit.
Checking method
Alarm (A.10) occurs if interface
unit is changed.
6. Faulty parts in interface unit.
Checking method
Alarm (A.10) occurs if base unit
is changed.
7. CNP3 or CNP1B connector
unplugged.
Faulty parts in the interface unit.
Checking method
Alarm (any of A.11 and 13)
occurs if power is switched on
after disconnection of all cables
but the control circuit power
supply cables.
C h eckin g m eth od
Alarm (A.15) occurs if power is
switched on after disconnection
of all cables but the control
circuit power supply cables.
9 - 3
Action
Review the power supply.
Change the base unit.
Change the interface unit.
Connect properly.
Change the interface unit.
Change the interface unit.