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6
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Machine Protection
This section explains functions for protecting the machine.
Reducing Noise and Leakage Current
The switching frequency of the output transistors in the MxC can be changed to reduce carrier noise and leak-
age current from the motor.
Related Parameters
* Fixed to 2:4 kHz for V/f.
For Open Loop Vector Control, can select from 2:4 kHz or 4:8 kHz (Fixed to 2: 4 kHz for a 200 V class MxC for 45 kW and a 400 V class MxCs for 22
kW and 45 kW).
Control Method and Carrier Frequency Settings
Carrier frequency settings are restricted as listed in the following table according to the control method selec-
tion.
* Fixed to 2: 4 kHz for 200 V class MxC for 45 kW and 400 V class MxCs for 22 kW and 45 kW
Note: The upper limit of the carrier frequency depends on the MxC capacity.
Carrier Frequency Setting Precautions
When selecting the carrier frequency, observe the following precautions.
•
Adjust the carrier frequency according to the cases shown below.
If the wiring distance between MxC and motor is long: Set the carrier frequency low. (Use the following
values as guidelines.)
If speed and torque are inconsistent at low speeds: Lower the carrier frequency.
If there is too much leakage current from the MxC: Lower the carrier frequency.
If the metallic noise from the motor is too loud: Raise the carrier frequency.
Parameter
Number
Name
Description
Setting
Range
Default
Change
during
Run
Control Methods
Display
V/f
Open
Loop
Vector
Flux
Vector
C6-02
Carrier Frequency
Selection
Select carrier frequency pattern.
2: 4 kHz
4: 8 kHz
6: 12 kHz
2, 4, or
6
*
2
No
Q
Q
Q
CarrierFreq Sel
Control Method
Carrier Frequency
V/f Control
2: 4.0 kHz
Open Loop Vector Control
2: 4.0 kHz
4: 8.0 kHz
*
Flux Vector Control
2: 4.0 kHz
4: 8.0 kHz
6: 12.0 kHz
Wiring Length
50 m or less
100 m or less
Over 100 m
C6-02 (Carrier Frequency
Selection) setting
2, 4, or 6
(4, 8, or 12 kHz)
2 or 4
(4 or 8 kHz)
2 (4 kHz)