APPENDICES
APP
−
23
Table 2.12 Servo Amplifier Error List (2000 to 2799) (Continued)
Error Cause
Error
Code
Amplifier
Type
Name
Description
When Error Checked
Error Processing
Corrective Action
A
•
During operation, communication
with the encoder is not normal.
•
Check wiring between the encoder and
ADU.
•
Change the servo motor (encoder).
2020
M
Position sensor
error 2
•
Fault in communication with the
encoder
•
Check the encoder cable connector for
disconnection.
•
Change the servo motor.
•
Change the encoder cable.
2021
M
Converter RD off
(400VAC series
servo only)
•
The servo-on (SON) signal turned
ON when the ready signal (RD) of
the converter is OFF.
1. Bus voltage is low.
2. Alarm occurring in converter.
•
Remove the cause of the converter
alarm. Deactivate the alarm.
2024
M
Output ground
fault
•
U, V, or W of the servo amplifier
output grounded
At any time during operation
•
Use a multimeter to check between the
U, V, and W terminals and the case.
•
Use a multimeter and megger to check
between the U, V, and W terminals of
the motor and the core.
A
Absolute position
erase
•
In the absolute value encoder, the
voltage of the super capacitor in
the encoder is less than 2.5
±
0.2V.
•
In the absolute value encoder,
speed was 500rpm or higher during
a power failure.
•
At power-on of servo
amplifier
•
At servo error reset
•
Change the battery (MR-JBAT ).
•
Check the wiring between encoder and
ADU.
•
The voltage of the supercapacitor
inside the absolute position sensor
has dropped.
•
Turn the power ON for 2 to 3 minutes to
charge the supercapacitor, switch the
power OFF then ON again, and
execute a zeroing.
•
The battery voltage is low.
•
Turn the servo amplifier power OFF,
then measure the battery voltage.
2025
M
Battery alarm
•
Failure of battery cable or battery.
(Zeroing must be re-executed after
clearing the error.)
•
When the servo amplifier
power is turned ON
•
At the leading edge of the
PLC READY flag (M2000)
•
When a servo error is reset
•
When the power to the
servo system CPU is
turned ON
•
Replace the servo amplifier battery.
2026
A
Module mismatch
•
The servo parameter (system
settings) does not match the real
servo amplifier.
•
At power-on of servo
amplifier
•
At servo error reset
•
Reconsider the system settings.
•
The frequency of ON/OFF
switching of the power transistor for
regeneration is too high. (Caution
is required since the regenerative
resistor could overheat.)
•
Reduce the frequency of acceleration
and deceleration or feed speed while
checking the servo monitor
regeneration level (%).
•
Reduce the load.
•
Increase the servomotor capacity.
•
Servo parameter (system settings)
setting error
•
Check the servo parameters
(regenerative resistor and motor type
settings in the system settings).
•
Incorrect wiring of regenerative
resistor
•
Connect the regenerative resistor
correctly.
•
Failure of regenerative resistor
•
Replace the regenerative resistor.
2030
M
Excessive
regeneration
•
Power transistor for regeneration
damaged by short circuit
•
Replace the servo amplifier.
•
The command speed is too high.
•
Reconsider the command speed.
•
Overshoot occurred during
acceleration.
•
Reconsider the servo parameter.
•
Encoder fault.
•
Change the encoder.
A
•
Encoder cable fault or wiring
mistake.
•
Check the wiring between encoder and
ADU.
•
The motor rpm has exceeded
115% of the rated rpm.
•
Check the motor rpm in the servo
parameters.
•
Check if the number of pulses per
revolution and travel value per
revolution in the fixed parameters
match the machine specifications.
•
An overshoot has occurred
because the acceleration time
constant is too small.
•
If an overshoot occurs during
acceleration, check the acceleration
time and deceleration time in the fixed
parameters.
•
An overshoot has occurred
because the servo system is
unstable.
•
If overshoot occurs, increase the speed
integral compensation by adjusting the
position loop gain / position control
gain 1, 2, speed loop gain / speed
control gain 1, 2 in the servo
parameters.
2031
M
Overspeed
•
Encoder fault.
At any time during operation
Immediate stop
•
Check the encoder cable for wire
breakage.
•
Change the servo motor.
