Instruction manual

7 - 5
7. TROUBLESHOOTING
Display Name Definition Cause Action
1. Ambient temperature of linear servo
motor is over 40
.
Review environment so that ambient
temperature is 0 to 40 .
2. Linear servo motor is overloaded. 1. Reduce load.
2. Review operation pattern.
3. Use linear servo motor that provides
larger output.
3. Thermistor in linear servo motor is
faulty.
Replace the primary side (coil) of linear
servo motor.
4. Thermistor wire breakage. Repair the wire.
46 Linear servo
motor overheat
Linear servo motor
temperature rose.
(Detected by
thermistor)
5. Thermistor connector (CN2)
disconnected.
Connect correctly.
47 Cooling fan
alarm
Refer to Chapter 8 of the MR-J3- B Servo Amplifier Instruction Manual.
1. Servo amplifier is used in excess
of its continuous output current.
1. Reduce load.
2. Review operation pattern.
3. Use linear servo motor that provides
larger output.
2. Servo system is instable and
hunting.
1. Repeat acceleration/
deceleration to execute auto tuning.
2. Change 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 linear servo
motor. Servo amplifier's output
terminals U, V, W do not match
linear servo motor's input terminals
U, V, W.
Connect correctly.
5. Encoder faulty.
Checking method
When the linear encoder is moved
with the servo off, the cumulative
feedback pulses do not vary in
proportion to the movement
amount of the linear encoder,
and the indication skips or returns
midway.
Change the linear encoder.
6. Linear encoder signal resolution is
different from the setting value.
Review the parameter No.PS02 and PS03
setting (linear encoder resolution setting).
Confirm the linear encoder installation.
7. Initial magnetic pole detection has
not been performed.
Perform initial magnetic pole detection.
50 Overload1 Load exceeded
overload protection
characteristic of
servo amplifier.
8. Discordance of the linear encoder
mounting direction.
Confirm the linear encoder mounting
direction.
Review the encoder pulse count polarity
selection in the parameter No.PC27
setting.