Appendix 3 Troubles and Solutions
Troubles and Solutions
220
Appendix 3 Troubles and Solutions
Troubles
Check points
Motionless motor
Main circuit
Check whether the power supply voltage between Terminals
R/L1, S/L2 and T/L3 is normal.
Check whether the Power light is on.
Check whether the wiring between the inverter and the motor is
correct.
Load
Check whether the load is too heavy.
Check whether the motor rotor is locked.
Parameters
Setting
Check whether the starting frequency (P.13) is set too big.
Check whether the operation mode (P.79) is correct.
Check whether the maximum frequency (P.1) is zero.
Check whether the reverse rotation prevention is restricted.
Check whether the bias and gain (P.192~P.199) setting is
correct.
Check that the frequency jump (P.91~P.96) setting is correct.
Control
circuit
Check whether the output stop signal "MRS” is on. (Related
parameter P.80~P.84, P.86, P.126, P.550).
Check whether the “RES” function is ON. (Related
parameter P.80~P.84, P.86, P.126, P.550).
Check whether the external thermal relay is operating or not.
Check whether the reset has been performed or not after the
set-off of the alarm (the ALARM light in on).
Check whether the voltage/current signals are correctly wired.
Check whether the functions of STF and STR are correct
(related parameter P.80~P.84, P.86, P.126, P.550).
Check whether the wiring for the control circuit is disconnected
or has a poor contact.
Reversed motor rotation
Check whether the phase sequence of output terminals U/T1, V/T2 and W/T3 is
correct.
Check whether the start signal (STF and STR) are connected correctly.
Failure to increase the
rotation speed of the
motor
Check whether the load is too heavy.
Check whether the stall prevention level (P.22) is correct.
Check whether the torque boost (P.0) is set too high.
Check whether the maximum frequency (P.1) is effective.
Unsmoothed
acceleration /
deceleration
Check whether the acceleration / deceleration time (P.7, P.8) is correct.
Check whether the acceleration / deceleration curve selection (P.29) is correct.
Check whether the voltage / current input signals are affected by noises.
Overlarge motor current
Check whether the load is too heavy.
Check whether the capacity of the inverter and of the motor are well matched.
Check whether the torque boost (P.0) is set too high.
Speed variation during
the operation
Check whether the voltage / current input signals are affected by noises.
Check whether the load varies.
Check whether the wiring length of the main circuit is too long.
