3. TROUBLESHOOTING AND
RECOVERY PROCEDURES
B–65195EN/01
TROUBLESHOOTING AND RECOVERY
46
Type LED Type LED Type LED
L-axis over-
current alarm
(HCL)
M-axis over-
current alarm
(HCM)
L-and M-axes
over-current
alarm (HCL)
(1) Check that following parameters are set to standard values. If they
are not, normal current control is impossible.
No. 1809
No. 2004 No. 8X04
No. 1884
No. 2006 No. 8X06
No. 1954 (15-A), 1955 (15-B)
No. 2011 No. 8X10
No. 1852
No. 2040 No. 8X40
No. 1853
No. 2041 No. 8X41
No. 1967
No. 2074 No. 8X74
No. 1991
No. 8X98No. 2098
(2) Disconnect the power wires from the amplifier terminals,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 terminals, and check
the U, V, and W wires for isolation from the grounding wire
sequentially.
If they are isolated from the grounding wire, go to (4) and (5).
If any of the power wires is short-circuited to the grounding wire,
disconnect the power wires from the motor connector, and check the
U, V, and W terminals of the motor for isolation from the ground
terminal sequentially.
If the U,V,or W terminal of the motor is short- circuited 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. 4.2.2 in Part I for how to measure)
If the motor current waveforms are abnormal,replace the
amplifier.
(5) Check that 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.
Action