MITSUBISHI ELECTRIC MR-J2S- A - Manual (Page 208)

10 - 11
10. TROUBLESHOOTING
Display Name Definition Cause Action
1. Servo amplifier fault caused the
parameter setting to be rewritten.
Change the servo amplifier.
2. Regenerative option not used with
servo amplifier was selected in
parameter No.0.
Set parameter No.0 correctly.
3. The number of write times to EEP-
ROM exceeded 100,000 due to
parameter write, etc.
Change the servo amplifier.
4.The alarm code output (parameter
No. 49) was set by the absolute
position detection system.
The absolute position detection system
and the alarm code output function are
exclusive. Set as either one of the two is
used.
AL.37 Parameter
error Parameter setting is
wrong.
5.The alarm code output (parameter
No.49) was set with the
electromagnetic brake interlock
(MBR) assigned to pin CN1B-19.
The signal assignment function of the
electromagnetic interlock (MBR) to pin
CN1B-19 and the alarm code output
function are exclusive. Set as either one of
the two is used.
1. Servo amplifier faulty. Change the servo amplifier.
2. The power supply was turned on
and off continuously by overloaded
status.
The drive method is reviewed.
AL.45 Main circuit
device overheat Main circuit device
overheat
3. Air cooling fan of servo amplifier
stops.
1. Exchange the cooling fan or the servo
amplifier.
2. Reduce ambient temperature.
1. Ambient temperature of servo
motor is over 40 (104 ).
Review environment so that ambient
temperature is 0 to 40 (32 to 104 ).
2. Servo motor is overloaded. 1. Reduce load.
2. Review operation pattern.
3. Use servo motor that provides larger
output.
AL.46 Servo motor
overheat Servo motor
temperature rise
actuated the
thermal sensor.
3. Thermal sensor in encoder is
faulty.
Change the servo motor.
1. Servo amplifier is used in excess
of its continuous output current.
1. Reduce load.
2. Review operation pattern.
3. Use servo motor that provides larger
output.
2. Servo system is instable and
hunting.
1. Repeat acceleration/
deceleration to execute auto tuning.
2. Change the auto tuning response
setting.
3. Set auto tuning to OFF and make gain
adjustment manually.
3. Machine struck something. 1. Review operation pattern.
2. Install limit switches.
4. Wrong connection of servo motor.
Servo amplifier’s output terminals
U, V, W do not match servo
motor’s input terminals U, V, W.
Connect correctly.
AL.50 Overload 1 Load exceeded
overload protection
characteristic of
servo amplifier.
5. Encoder faulty.
Checking method
When the servo motor shaft is
rotated with the servo off, the
cumulative feedback pulses do
not vary in proportion to the
rotary angle of the shaft but the
indication skips or returns midway.
Change the servo motor.