Power On And Off Procedures - Mitsubishi Electric MELSERVO-J4 MR-J4 A Series Instruction Manual

4. STARTUP
4.2 Startup in position control mode
Make a startup in accordance with section 4.1. This section provides the methods specific to the position
control mode.

4.2.1 Power on and off procedures

(1) Power-on
Switch power on in the following procedure. Always follow this procedure at power-on.
1) Switch off SON (Servo-on).
2) Make sure that a command pulse train is not input.
3) Switch on the main circuit power supply and control circuit power supply.
When main circuit power/control circuit power is switched on, the display shows "C (Cumulative
feedback pulses)", and in 2 s later, shows data.
In the absolute position detection system, first power-on results in [AL. 25 Absolute position
erased] and the servo system cannot be switched on. The alarm can be deactivated by then
switching power off once and on again.
Also, if power is switched on at the servo motor speed of 3000 r/min or higher, position mismatch
may occur due to external force or the like. Power must therefore be switched on when the servo
motor is at a stop.
(2) Power-off
1) Make sure that a command pulse train is not input.
2) Switch off SON (Servo-on).
3) Switch off the main circuit power supply and control circuit power supply.
4.2.2 Stop
If any of the following situations occurs, the servo amplifier suspends the running of the servo motor and
brings it to a stop. Refer to section 3.10 for the servo motor with an electromagnetic brake.
Operation/command
Switch of SON (Servo-on).
Alarm occurrence
EM2 (Forced stop 2) off
STO (STO1, STO2) off
LSP (Forward rotation stroke end) of LSN
(Reverse rotation stroke end) off
The base circuit is shut off and the servo motor coasts.
The servo motor decelerates to a stop with the command. With some alarms,
however, the dynamic brake operates to bring the servo motor to a stop. (Refer to
section 8.1.)
The servo motor decelerates to a stop with the command. [AL. E6 Servo forced stop
warning] occurs. EM2 has the same function as EM1 in the torque control mode.
Refer to section 3.5 for EM1.
The base circuit is shut off and the dynamic brake operates to bring the servo motor to
a stop.
It will bring the motor to a sudden stop and make it servo-locked. It can be run in the
opposite direction.
4 - 4
Stopping condition