YASKAWA T1000A Technical Manual page 153

Note: The value in parenthesis indicates the carrier frequency for AOLV/PM.
Guidelines for Carrier Frequency Parameter Setup
Speed and torque are unstable at low speeds
Noise from the drive affects peripheral devices
Excessive leakage current from the drive
Wiring between the drive and motor is too long
Audible motor noise is too loud
<1> The carrier frequency may need to be lowered if the motor cable is too long. Refer to the table below.
<2> Increasing the carrier frequency is fine when the drive is set for Normal Duty, but remember that the drive rated current falls when the carrier
frequency is increased.
Wiring Distance
Recommended setting value for C6-02
Note: The maximum cable length is 100 m when using OLV/PM (A1-02 = 5) or AOLV/PM (A1-02 = 6).
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C6-03, C6-04, C6-05: Carrier Frequency Upper Limit, Lower Limit, Proportional Gain
Use these parameters to set a user defined or a variable carrier frequency. To set the upper and lower limits and the carrier
frequency proportional gain, first set C6-02 to F.
No.
C6-03
C6-04
C6-05
Setting a Fixed User Defined Carrier Frequency
A carrier frequency between the fixed selectable values can be entered in parameter C6-03 when C6-02 is set to F. In V/f
Control, parameter C6-04 must also be adjusted to the same value as C6-03.
Setting a Variable Carrier Frequency (V/f Control)
In V/f Control, the carrier frequency can be set up to change linearly with the output frequency. To do this, set the upper
and lower limits for the carrier frequency and the carrier frequency proportional gain (C6-03, C6-04, C6-05) as shown in
Figure 5.37.
Figure 5.37
Note: 1. C6-03 takes priority when the carrier frequency proportional gain C6-05 > 27 and C6-03 < C6-04.
2. When C6-05 is set lower than 7, C6-04 is disabled and the carrier frequency will be fixed to the value set in C6-03.
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C6-06 PWM Method
Determines how the drive should perform pulse width modulation. Enabled only when parameter C6-02 is set to F.
No. Parameter Name
C6-06
0: 2-phase/3-phase conversion
1: 2-phase modulation
2: 3-phase modulation
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual
Symptom
<1>
Up to 50 m
1 to 6, F (up to 15 kHz)
Parameter Name
Carrier Frequency Upper Limit
Carrier Frequency Lower Limit (V/f Control only)
Carrier Frequency Proportional Gain (V/f Control only)
Carrier Frequency
C6-03
C6-04
Figure 5.37 Carrier Frequency Changes Relative to Output Frequency
PWM Method
Lower the carrier frequency.
Increase the carrier frequency or use Swing PWM.
Up to 100 m
1 to 2 (up to 5 kHz)
Output
Frequency x C6-05
Output Frequency
E1-04
Max Output Frequency
Setting Range
0 to 2
5.3 C: Tuning
Remedy
<2>
Greater than 100 m
1 (up to 2 kHz)
Setting Range Default
1.0 to 15.0 kHz
1.0 to 15.0 kHz Determined by C6-02
0 to 99
Default
2 when C6-02 = 1
0 for all other C6-02 settings
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