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6.2 Fault Detection
Table 6.2 Fault Displays, Causes, and Possible Solution
Output power cable is
damaged
Check and replace output power
cable
oVA、
oVd、
oVC、
oVAH、
oVdH、
ovCH
Overvoltage
(Acceleration,
Deceleration and
Constant Speed)
The main circuit DC
voltage exceeded the
overvoltage
detection level
200V class: 410V
400 V class: 820 V
1. Regenerative energy is
flowing from the motor into
the drive because the
deceleration time is too
short
2. The motor overshoot the
speed reference because the
acceleration time is too short
3. Excessive braking load
4. Surge voltage entering
from the drive input power
5. Motor short-circuited
Ground fault current charges
the drive main circuit
capacitor.
6. Improper parameter
settings for Speed Search
(including Speed Search
after a fault restart and after
a momentary power loss)
7. Drive input voltage is too
high
8. The braking transistor or
braking resistor are wired
incorrectly
9. PG cable is disconnected
10. PG cable wiring is
incorrect
11. PG encoder wiring has
interference of electrical
signal
1. Increase the deceleration time
settings (C1-01 and C1-03)
»Install a braking unit
»Set P3-03 (Stall Prevention during
Deceleration) to 1
(Enabled)(default is 1)
2. Confirm if overvoltage alarm
oVA or oVC was triggered
during sudden drive
acceleration.
»Increase the acceleration time
»Use S-curve deceleration and
acceleration times and increase
the value set to C2-01 ( S-curve
at acceleration end )
3.Thyristor convertor and phase
advancing capacitor using the
same input power supply might
cause a voltage surge
4. Check the motor power cable,
relay terminals and motor
terminal box
» Correct grounding shorts and
reapply power
5. Adjust parameter settings for
Speed Search (group b3)
»Proceed Auto-Tuning for line-
to-line resistance
6. Check the voltage
»Lower drive input power
voltage within the range listed in
the drive specifications
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