4-186
11 Auxiliary Parameters
11-00
Direction Lock Selection
Range
【
0
】
:
Allow forward and reverse rotation
【
1
】
:
Only allow forward rotation
【
2
】
:
Only allow reverse rotation
If Direction Lock Selection parameter 11-01 is set to 1 or 2, the motor only operates in that specific direction. A
run command for the opposite direction will run in the selected direction. Forward or reverse commands can be
issued via the control terminals, keypad or communication.
Note:
This parameter can be used in fan and pump application where reverse rotation is prohibited.
11-01
Carrier frequency
Range
【
1~16
】
KHz
Sets the inverter carrier frequency in kHz (IGBT switching frequency).
Notes:
(1) Value 1 to 16 represents kHz.
(2) Setting range depends on inverter rating (13-00) and HD/ND mode (00-27).
(3) Refer to section 3 inverter derating based on carrier frequency.
(4) A low carrier frequency increases motor noise but reduces motor losses and temperature.
(5) A low carrier frequency decreases RFI, EMI interference and motor leakage current.
Refer to the carrier frequency table 4.3.35
Table 4.3.35 Carrier frequency settings
Carrier Frequency
1KHz
6KHz
10KHz
16KHz
Motor noise
High
------------------------
Low
Output current waveform
(similar to sinusoidal wave)
Fair
-------- Good -------
Better
Noise interference
Low
------------------------
High
Leakage current
Low
------------------------
High
Heat loss
Low
-------------------------
High
If cable length between the inverter and the motor is too long, the high-frequency leakage current will cause an
increase in inverter output current, this might affect peripheral devices. Adjust the carrier frequency to avoid this
as shown in table 4.3.36.
Table 4.3.36 Cable length and carrier frequency
Wire length
< 30m
(<98ft)
<50m
(<164ft)
<100m
(<328ft)
>100m
(>328ft)
Carrier frequency
(11-01 value)
Max value 16KHz
(11-01=16KHz)
Max value 10KHz
(11-01=10KHz)
Max value 5KHz
(11-01=5KHz)
Max value 2KHz
(11-01=2KHz)
Reduce the carrier frequency if the torque does not match the speed.
