11-13
11-4 Troubleshooting
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
11
Troubleshooting and Maintenance
14
0 Overcurrent
The current flowing between P and N
of the converter exceeded the
specified value.
· The Servo Drive is faulty (faulty
circuit, faulty IGBT part, etc.).
· The Servomotor cable is short-
circuited between phases U, V,
and W.
· The Servomotor cable is ground-
faulted.
· Motor windings are burned out.
· The Servomotor wiring contact is
faulty.
· The relay for the dynamic brake
has been welded due to frequent
servo ON/OFF operations.
· The command pulse input timing
is the same as or earlier than the
servo ON timing.
· Disconnect the Servomotor cable,
and turn ON the servo. If the
problem immediately recurs,
replace the Servo Drive with a new
one.
· Check to see if the Servomotor
cable is short-circuited between
phases U, V and W by checking
for loose wire strands on the
connector leads. Connect the
Servomotor cable correctly.
· Check the insulation resistance
between phases U, V, and W of
the Servomotor cable and the
grounding wire of the Servomotor.
If the insulation is faulty, replace
the Servomotor.
· Check the balance between the
resistance of each wire of the
Servomotor. If resistance is
unbalanced, replace the
Servomotor.
· Check for missing connector pins
in Servomotor connections U, V,
and W. If any loose or missing
connector pins are found, secure
them firmly.
· Replace the Servo Drive.
Do not turn ON the Servo for at
least ten minutes after using the
dynamic brake.
· Wait at least 100 ms after the
Servo is turned ON, then input
commands.
1 IPM error
15 0 Servo Drive overheat
The temperature of the Servo Drive
radiator or power elements exceeded
the specified value.
· The ambient temperature of the
Servo Drive exceeded the
specified value.
· Overload
· Improve the ambient temperature
and the cooling conditions of the
Servo Drive.
· Increase the capacities of the
Servo Drive and the Servomotor.
Set longer acceleration and
deceleration times. Reduce the
load.
Alarm
number
Name Cause Measures
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