5.2 Troubleshooting
PROTECTIVE FUNCTIONS
135
5.2 Troubleshooting
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 (POWER lamp is lit).
Check that the motor is connected
ro
erl
.
Check that the conductor across P1-P is connected.
2) Check the input signals
Check that the start si
nal is in
ut.
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 out
ut sto
si
nal
MRS
or reset si
nal
RES
is not on.
Check whether the terminals P24-SD are short-circuited.
3) Check the parameter settings
Check that the reverse rotation
revention
Pr. 78
is not selected.
Check that the o
eration mode
Pr. 79
settin
is correct.
Check that the starting frequency (Pr. 13) setting is not greater than the
running frequency.
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.
5) Others
Check that the ALARM lam
is off.
5.2.2 Motor rotates in opposite direction
Check that the
hase se
uence of out
ut terminals U, V and W is correct.
Check that the start signals (forward rotation, reverse rotation) are connected
properly.
