Alarm Occurrence Timing Chart - Mitsubishi Electric MR-J2S B Series Instruction Manual

3. SIGNALS AND WIRING

3.3 Alarm occurrence timing chart

CAUTION
When an alarm occurs in the servo amplifier, the base circuit is shut off and the servo motor is coated to a
stop. Switch off the main circuit power supply in the external sequence. To deactivate the alarm, power
the control circuit off, then on or give the error reset or CPU reset command from the servo system
controller. However, the alarm cannot be deactivated unless its cause is removed.
(Note)
Main circuit
power ON
Control circuit
OFF
ON
Base circuit
OFF
Valid
Dynamic brake
Invalid
ON
Servo-on command
(from controller) OFF
Alarm
Reset command
ON
(from controller) OFF
Note. Switch off the main circuit power as soon as an alarm occurs.
(1) Overcurrent, overload 1 or overload 2
If operation is repeated by switching control circuit power off, then on to reset the overcurrent (32),
overload 1 (50) or overload 2 (51) alarm after its occurrence, without removing its cause, the servo
amplifier and servo motor may become faulty due to temperature rise. Securely remove the cause of
the alarm and also allow about 30 minutes for cooling before resuming operation.
(2) Regenerative alarm
If operation is repeated by switching control circuit power off, then on to reset the regenerative (30)
alarm after its occurrence, the external regenerative resistor will generate heat, resulting in an
accident.
(3) Instantaneous power failure
Undervoltage (10) occurs when the input power is in either of the following statuses.
A power failure of the control circuit power supply continues for 60ms or longer and the control
circuit is not completely off.
The bus voltage dropped to 200VDC or less for the MR-J2S B, or to 158VDC or less for the MR-J2S
B1.
When an alarm has occurred, remove its cause, make sure that the operation
signal is not being input, ensure safety, and reset the alarm before restarting
operation.
As soon as an alarm occurs, make the Servo off status and interrupt the main
circuit power.
Brake operation
NO
1s
Alarm occurs. Remove cause of trouble.
YES
NO
50ms or more
3 - 9
Power off
Power on
Brake operation
YES NO
60ms or more