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11. TROUBLESHOOTING
Display Name Definition Cause Action
1. Short occurred in servo amplifier
output phases U, V and W.
Correct the wiring.
2. Transistor (IPM) of the servo
amplifier faulty.
Checking method
Alarm (AL.32) occurs if power is
switched on after U,V and W
are disconnected.
Change the servo amplifier.
3. Ground fault occurred in servo
amplifier output phases U, V and
W.
Correct the wiring.
AL.32 Overcurrent Current that flew is
higher than the
permissible current
of the servo
amplifier. (If the
alarm (AL.32) occurs
again when turning
ON the servo after
resetting the alarm
by turning OFF/ON
the power when the
alarm (AL.32) first
occurred, the
transistor (IPM,
IGBT) of the servo
amplifier may be at
fault. In the case, do
not repeat to turn
OFF/ON the power.
Check the transistor
with the checking
method of “Cause
2”.)
4. External noise caused the
overcurrent detection circuit to
misoperate.
Take noise suppression measures.
AL.33 Overvoltage
1. Regenerative option is not used. Use the regenerative option.
Converter bus
voltage exceeded
400VDC.
2. Though the regenerative option is
used, the parameter No. 0 setting
is "
0 (not used)".
Make correct setting.
3. Lead of built-in regenerative
resistor or regenerative option is
open or disconnected.
1. Change lead.
2. Connect correctly.
4. Regenerative transistor faulty. Change servo amplifier
5. Wire breakage of built-in
regenerative resistor or
regenerative option
1. For wire breakage of built-in
regenerative resistor, change servo
amplifier.
2. For wire breakage of regenerative
option, change regenerative option.
6. Capacity of built-in regenerative
resistor or regenerative option is
insufficient.
Add regenerative option or increase
capacity.
7. Power supply voltage high. Review the power supply.
8. The jumper across BUE-SD of the
FR-BU2 brake unit is removed.
Fit the jumper across BUE-SD.
AL.35
1. Pulse frequency of the manual
pulse generator is too high.
Change the pulse frequency to a proper
value.
Command pulse
frequency error
Input pulse
frequency of the
command pulse is
too high.
2. Noise entered the pulses of the
manual pulse generator.
Take action against noise.
3. Manual pulse generator failure Change the manual pulse generator.