5 Troubleshooting
5
- 55 -
Cause Conîš¿rming Methods Corrective Action
3. The regenerative
resistor fails.
If internal regenerative resistor is used
(H02-25 = 0), check whether
and D
are connected with a cable reliably. If
yes, measure resistance between C and
D.
If external regenerative resistor is used
(H02-25 = 1/2), measure resistance
between
and C.
For regenerative resistor speciîš¿cation,
refer to Chapter 1.
If resistance is ∞, wire breaking occurs.
If internal regenerative resistor is used and
resistance is 0, use external regenerative resistor
(H02-25 = 1/2) and remove cable between
and D. Select external regenerative resistor
of the same resistance and power as internal
regenerative resistor.
If external regenerative resistor is used, connect
a new regenerative resistor between
and C.
Make H02-26 (power of external regenerative
resistor) and H02-27 (resistance of external
regenerative resistor) consistent with external
regenerative resistor speciîš¿cation.
Resistance of
the regenerative
resistor is too
large, and energy
absorption
during braking is
insufîš¿cient.
Measure resistance of the external
regenerative resistor between
and C.
Compare the measured value with the
recommended value.
Connect a new external regenerative resistor of
recommended resistance between
and C.
Make H02-26 (power of external regenerative
resistor) and H02-27 (resistance of external
regenerative resistor) consistent with external
regenerative resistor speciîš¿cation.
Motor is in abrupt
acceleration/
deceleration status.
Maximum braking
energy exceeds
energy absorption
value.
Conîš¿rm acceleration/deceleration time
during running and measure DC bus
voltage between
and
. Check
whether voltage exceeds fault level
during deceleration.
First, ensure that input voltage of main circuit is
within speciîš¿cation. Then increase acceleration/
deceleration time in allowed range.
Bus voltage
sampling value has
a large deviation
from the measured
value
Check whether H0B-26 (bus voltage) is
within the following speciîš¿cation:
220 V drive: H0B-26 > 420 V
380 V drive: H0B-26 > 760V
Measure the DC bus voltage between
and
. Check whether the DC bus
voltage is normal and smaller than H0B-
26.
Contact Inovance for technical support.
7. The servo drive
is faulty.
The fault persists after main circuit is
powered on several times.
Replace the servo drive.
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