Instruction manual

7 - 2
7. TROUBLESHOOTING
7.2 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.
As soon as an alarm occurs, mark Servo-off and power off the main circuit and
control circuit.
POINT
When any of the following alarms has occurred, do not deactivate the alarm
and resume operation repeatedly. To do so will cause the servo amplifier/linear
servo motor to fail. Remove the cause of occurrence, and leave a cooling time
of more than 30 minutes before resuming operation. 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 (30)
Overload 1 (50)
Overload 2 (51)
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 8.1.
When an alarm occurs, the trouble (ALM) switches off and the dynamic brake is operated to stop the linear
servo motor. At this time, the display indicates the alarm No.
The linear servo motor comes to a stop. Remove the cause of the alarm in accordance with this section. MR
Configulator may be used to refer to the cause.
Display Name Definition Cause Action
10 Undervoltage
12
Memory error1
(RAM)
13
Clock error
15
Memory error2
(EEP-ROM)
Refer to Chapter 8 of the MR-J3-
B Servo Amplifier Instruction Manual.
1. Encoder connector (CN2L)
disconnected.
Connect correctly.
2. Encoder fault Change the linear encoder.
3. Encoder cable faulty
(Wire breakage or shorted)
Repair or change cable.
Communication error
occurred between
serial
communications type
encoder and servo
amplifier.
4. Encoder cable type (2-wire, 4-wire)
selection was wrong in parameter
setting.
Correct the setting in the fourth digit of
parameter No. PC26.
5. Encoder connector (CN2L)
disconnected.
Connect correctly.
6. Encoder fault Change the linear encoder.
16
Encoder error1
(At power on)
Communication error
occurred between
ABZ differential
output type and
servo amplifier.
7. Encoder cable faulty
(Wire breakage or shorted The
connection between PSEL and LG is
not established.)
Repair or change cable.