
3.TROUBLESHOOTING AND
RECOVERY PROCEDURES TROUBLESHOOTING AND RECOVERY
B-65235EN/02
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Fan alarm
(FAL)
Check if the fan,built into the servo amplifier unit, has
stopped.
If it is not stopped, replace the servo amplifier.
Over-current alarm
(HC)
(1) Check that following parameter are set to standard
values. If they are not , normal current is
impossible.
For digital servo software(9046, 9060, 9070 series)
For digital servo software(9066, 9080 series)
Make sure that besides the parameters for conventional
control described above, the following parameters have
standard values.
(2) Disconnect the power wires from the amplifier
connector, and release the emergency stop
condition.
If an overcurrent alarm is issued, replace the
amplifier.
If an overcurrent alarm is not issued, go to (3).
(3) Disconnect the power wires from the amplifier
connector, and check the U,V and W wires for
isolation from grounding wire sequentially.
If they are isolated from the grounding wire, go to
(4), (5).
If any of the power wires is short-circuited to the
grounding wire, disconnect the power wires from the
motor connector, amd check the U, V, and W
terminals of the motor for isolation from the ground
terminal sequentially.
If the U, V, W terminal of the motor is short-circuit to
the ground terminal, replace the motor.
If they are isolated from the ground terminal,
replace the power wires.
(4) Connect the wires again, and observe the motor
current (IR, IS) waveforms when the motor is
accelerating or decelerating. (See Subsec. I-4.4.2
for how to measure)
If the motor current waveforms are abnormal,
replace the amplifier.
(5) Check if noise is induced on the motor current (IR,
IS) waveforms.
If there is noise, shield the wires and ground the
shielding. If there is no noise, replace the amplifier.
(6) If any of the above five items does not fit the case,
the pulse coder, command cable or the hardware
inside the CNC is probably defective.
No.8X04No.2004
No.8X40No.2040
No.8X06No.2006
No.8X41No.2041
No.8X10No.2011
No.8X74No.2074 No.8X98No.2098
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–No.2057
No.2111
No.2058
No.2127
No.2110
No.2128 No.2129
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