77
5
TROUB
L
E
S
HOOTING
Check first when you have troubles.
5.6 Check first when you have troubles.
POINT
If the cause is still unknown after every check, it is recommended to initialize the parameters (initial value) then
re-set the required parameter values and check again.
Check that the reverse rotation prevention selection
(Pr.78)
is not selected.
5.6.1
Motor does not rotate as commanded
1) Check the
Pr. 0 Torque boost. (Refer to page 52)
2) Check the main circuit.
Check that a proper power supply voltage is applied (operation panel display is provided).
Check that the motor is connected properly.
Check that the jumper across P/+-P1 is connected.
3) Check the input signals
Check that the start signal is input.
Check that both the forward and reverse rotation start signals are not input simultaneously.
Check that the frequency setting signal is not zero. (When the frequency command is 0Hz and
the run command is entered, FWD or REV LED on the operation panel flickers.)
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 CS signal is not OFF with automatic restart after instantaneous power failure
function is selected (
Pr. 57
≠
"9999").
Check that the sink or source jumper connector is fitted securely.
4) Check the parameter settings
Check that the operation mode selection
(Pr. 79)
setting is correct.
Check that the bias and gain
(calibration parameter C2 to C7)
settings are correct.
Check that the starting frequency
(Pr.13)
setting is not greater than the running frequency.
Check that frequency settings of each running frequency (such as multi-speed operation) are not zero.
Check that especially the maximum frequency
(Pr.1)
is not zero.
5) Inspection of load
Check that the load is not too heavy.
Check that the shaft is not locked.
Check that the
Pr.15 Jog frequency
setting is not lower than the
Pr.13 Starting frequency
value.
5.6.2
Motor generates abnormal noise
No carrier frequency noises (metallic noises) are generated.
Check for any mechanical looseness.
Soft-PWM operation to change the motor tone into an unoffending complex tone is
factory-set to valid by the
Pr.72 PWM frequency selection
.
Adjust
Pr.72 PWM frequency selection
to change the motor tone.
(When operating the inverter with the carrier frequency of 3kHz or more set in
Pr. 72
, the
carrier frequency will automatically decrease if the output current of the inverter exceeds
the value in parenthesis of the rated output current on
page 90
. This may cause the motor
noise to increase. But it is not a fault.)
Contact the motor manufacturer.
5.6.3
Motor generates heat abnormally
Is the fan for the motor is running? (Check for accumulated dust.)
Check that the load is not too heavy. Lighten the load.
Check that the inverter output voltages (U, V, W) balanced.
Check that the
Pr.0 Torque boost
setting is correct.
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