Mitsubishi Electric FR-D700 Series Instruction Manual page 44

Check first when you have a trouble
8.3 Check first when you have a trouble
Description
Motor does not start.
Motor or machine is making abnormal
acoustic noise.
Inverter generates abnormal noise.
Motor generates heat abnormally.
Motor rotates in the opposite direction.
Speed greatly differs from the setting.
Acceleration/deceleration is not smooth.
Speed varies during operation.
Operation mode is not changed properly.
Operation panel display is not operating.
Motor current is large.
Speed does not accelerate.
Unable to write parameter setting.
* For further information on troubleshooting,
40
Check start and frequency command sources and enter a start command (STF, etc.) and a
frequency command.
Take EMC measures if a steady operation cannot be performed due to EMI. Alternatively, set
the Pr.74 Input filter time constant setting higher.
Install the fan cover correctly.
Clean the motor fan. Improve the environment.
Connect phase sequence of the output cables (terminal U, V, W) to the motor correctly.
Alternatively, check the connection of the start signal. (STF: forward rotation, STR: reverse
rotation)
Check the settings of Pr.1 Maximum frequency, Pr.2 Minimum frequency, Pr.18 High speed maximum
frequency, and calibration parameters C2 to C7.
Reduce the load. Alternatively, increase the acceleration/deceleration time.
Check the frequency setting signals. If the load fluctuates, select General-purpose magnetic
flux vector control.
Turn OFF the start signal (STF or STR). Check if Pr.79 Operation mode selection is set
appropriately.
Check the wiring and the installation.
Increase/decrease the Pr.0 Torque boost setting value by 0.5% increments so that stall
prevention does not occur. Set the rated motor frequency to Pr.3 Base frequency.
Check the settings of Pr.1 Maximum frequency, Pr.2 Minimum frequency, and calibration parameters
C2 to C7. To operate at 120Hz or higher, set Pr.18 High speed maximum frequency.
Check Pr.77 Parameter write selection setting.
refer to the Instruction Manual (Applied).
Countermeasure