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
y Check that a proper power supply voltage is applied (control panel display is
y Check that the motor is connected properly.
2) Check the input signals
y Check that the start signal is input.
y Check that both the forward and reverse rotation start signals are not input.
y Check that the frequency setting signal is not zero.
y Check that the AU signal is on when the frequency setting signal is 4 to 20mA.
y Check that the output stop signal (MRS) or reset signal (RES) is not on.
3) Check the parameter settings
y Check that the reverse rotation prevention (Pr. 78) is not selected.
y Check that the operation mode (Pr. 79) setting is correct.
y Check that the bias and gain (Pr. 902 to Pr. 905) settings are correct.
y Check that the starting frequency (Pr. 13) setting is not greater than the
y Check that various operational functions (such as three-speed operation),
especially the maximum frequency (Pr. 1), are not zero.
y Check that the manufacturer setting parameter Pr. 146 = 1.
4) Check the load
y Check that the load is not too heavy.
y Check that the shaft is not locked.
y Check that the ALARM lamp is off.
y Check that the control panel display does not show an error (e.g. E.OC1).
y 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
y Check that the phase sequence of output terminals U, V and W is correct.
y Check that the start signals (forward rotation, reverse rotation) are connected