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
7. Check the wiring of the
braking resistor and braking unit
»Correct the wiring