Specifications

8. TROUBLESHOOTING
8– 8
CN1B-
19 pin
Display
CN1A-
18 pin
CN1A-
19 pin
Name Definition ActionCause
Faulty parts in the servo amplifier
Checking method
Alarm (A. 17 or A. 18) occurs if
power is switched on after
CN1A, CN1B, and CN3
connectors have been disconnected.
A. 20 1 1 0 Encoder
error 2
Communication error
occurred between
encoder and servo
amplifier.
1. Encoder connector disconnected. Connect correctly.
Alarm Code
A. 17
000
Board error 2 CPU/parts fault Change the servo
amplifier.
A. 18
000
Board error 3
2. Encoder cable faulty
(wire breakage or short)
Repair or change
the cable.
A. 24 1 0 0 Motor output
ground fault
Ground fault
occurred at servo
motor outputs
(U, V, W phases)
of servo amplifier.
1. Power input wires and servo motor
output wires are in contact at main
circuit terminal block (TE1).
2. The servo motor power line cover is
deteriorated, and causes earthing.
Connect correctly.
Replace the line.
A. 25 1 1 0 Absolute
position erase
Absolute position
data in error
Power was switched
on for the first time
in the absolute
position detection
system.
1. Reduced voltage of super
capacitor in encoder
After leaving the alarm
occurring for a few
minutes, switch power
off, then on again.
Ensure to make home
position return again.
After leaving the
alarm occurring for
a few minutes, switch
power off, then on
again. Home position
setting must be made
again.
2. Battery voltage low Change battery.
Ensure to make
home position
return again.
4. Super capacitor of the absolute
position encoder is not charged
3. Battery cable or battery is
faulty.
A. 30 0 0 1 Regenerative
error
The permissible
regenerative
power of the
built-in
regenerative
brake resistor
or regenerative
brake option is
exceeded.
1. Wrong setting of parameter No. 0 Set correctly.
2. Built-in regenerative brake
resistor or regenerative brake
option is not connected.
3. High-duty operation or continuous
regenerative operation caused the
permissible regenerative power of
the regenerative brake option to be
exceeded.
Checking method
Call the status display and check
the regenerative load ratio.
Checking method
1) The regenerative brake option
has overheated abnormally.
2) The alarm occurs after removal of
the built-in regenerative brake resistor
or regenerative brake option.
Connect correctly.
1. Reduce the
frequency of
positioning.
2. Use the
regenerative
brake option of
larger capacity.
3. Reduce the load.
4. Power supply voltage
increased to 260V or more.
Review power
supply.
6. Built-in regenerative brake
resistor or regenerative brake
option faulty.
Change servo amplifier
or regenerative brake
option.
Regenerative
transistor fault
5. Regenerative transistor faulty. Change the servo
amplifier.
3.
The main circuit of the servo
amplifier is broken.
Replace the
servo amplifier.
Investigating method
Disconnect the U, V, and W power
lines from the servo amplifier, and turn
on the servo motor. A. 24 still occurs.