Parameter Description
Parameters
74
5.15
Carrier Operation Selection
(P.31) V/F
P.31 “Carrier operation selection”
● Soft-PWM is a control method that turns motor noises into pleasant complex tones.
● Motor noise modulation control is when the inverter varies its carrier frequency from time to
time during the operation. The metal noises generated by the motor are not a single
frequency. This function selection is to improve the high peak single frequency noises.
● This function is only valid under the V/F mode; i.e., it is effective when P.300=0.
Note: 1. For the function of rated current decreasing with rated carrier change, please refer to the figure of
P.72.
2. The decreasing level of carrier is different from different frame, the details: frame AA and frame A/B is
9K;
frame D/E is 4k; frame F is 2K
.
5.16 Communication Function(P.32, P.33, P.36, P.48~P.53, P.153
and P.154)
P.32 “Serial communication Baud rate
selection”
P.36 “Inverter station number”
P. 49 “Stop bit length”
P.33 “Communication protocol
selection”
P.48 “Data length”
P.50 “Parity check selection”
P.51 “CR & LF selection”
P.53 “Communication check time
interval”
P.153 “Communication error
handling”
P.52 “Number of communication
retries”
P.154 “Modbus communication data
format”
Parameter
Factory
setting
Setting
range
Remarks
31
0
0
The rated current decreases with rated carrier
change(note 1)
1
when P.72 < 5, Soft-PWM is valid (only apply to
V/F control )
2
When P.72> 9(note 2),the temperature of module
is higher than 60 degree, carrier will decrease to
9k automatically (note 2); after the temperature
drops to lower than 40 degree, carrier will restore
the setting value of P.72
