Instruction manual

7 - 6
7. TROUBLESHOOTING
Display Name Definition Cause Action
1. Machine struck something. 1. Review operation pattern.
2. Install limit switches.
2. 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.
3. 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.
4. 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.
5. 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.
6. Initial magnetic pole detection has
not been performed.
Perform initial magnetic pole detection.
51 Overload2 Machine collision or
the like caused max.
output current to flow
successively for
several seconds.
7. 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.
52 Error
excessive
8A USB
communication
time-out error
8E USB
communication
error
888 Watchdog
Refer to Chapter 8 of the MR-J3-
B Servo Amplifier Instruction Manual.