POINT: Check the corresponding areas. If the cause is still unknown, it is
recommended to initialize the parameters (return to factory settings), re-set
the required parameter values, and check again.
5.2.1 Motor remains stopped
1) Check the main circuit
Check that a proper power supply voltage is applied (operation panel display is
Check that the motor is connected properly.
Check that the conductor across P1-P is connected.
2) Check the input signals
Check that the start signal is input.
Check that both the forward and reverse rotation start signals are not input.
Check that the frequency setting signal is not zero.
Check that the AU signal is on when the frequency setting signal is 4 to 20mA.
Check that the output stop signal (MRS) or reset signal (RES) is not on.
Check that the sink/source jumper connector is fitted securely (400V class only).
3) Check the parameter settings
Check that the reverse rotation prevention (Pr. 78) is not selected.
Check that the operation mode (Pr. 79) setting is correct.
Check that the frequency setting command selection (Pr. 146) setting is correct.
Check that the bias and gain (Pr. 902 to Pr. 905, Pr. 922, Pr. 923) settings are
Check that the starting frequency (Pr. 13) setting is not greater than the
Check that various operational functions (such as three-speed operation),
especially the maximum frequency (Pr. 1), are not zero.
4) Check the load
Check that the load is not too heavy.
Check that the shaft is not locked.
Check that the ALARM lamp is off.
Check that the operation panel display does not show an error (e.g. E.OC1).
Check that the Pr. 15 "jog frequency" setting is not lower than the Pr. 13
"starting frequency" value.
5.2.2 Motor rotates in opposite direction
Check that the phase sequence of output terminals U, V and W is correct.
Check that the start signals (forward rotation, reverse rotation) are connected