YASKAWA Varispeed G7 Series Instruction Manual page 278

Carrier Frequency
C6-03
C6-04
* K is the coefficient determined by the set
value in C6-03.
C6-03 ³ 10.0 kHz: K = 3
10.0 kHz > C6-03 ³ 5.0 kHz: K = 2
5.0 kHz < C6-03: K = 1
With vector control, the carrier frequency is fixed to the Carrier Frequency Upper Limit in C6-03 if user-
•
set or by the carrier frequency set in C6-02.
To fix the carrier frequency, set C6-03 and C6-04 to the same value, or set C6-05 to 0.
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If the settings are as shown below, OPE11 (Constant setting error) will occur.
•
If Carrier Frequency Proportional Gain (C6-05) > 6 and C6-03 < C6-04.
The Inverter overload current level can be reduced by the carrier frequency setting, and an OL2 (Inverter
•
overload) may be detected even if the overload current is smaller than 150%. The reduction levels of the
Inverter overload current are shown in the following figures.
Overload current reduction level
100%
80%
50%
0
Fig 6.36 Reduction Levels for V/f, V/f with PG, Open-loop Vector 1, and Flux Vector Control
Output frequency ´ C6-05
´ K*
E1-04
Max. Output Frequency
Fig 6.35
200 V Class,
22 kW
10 kHz 15 kHz
Machine Protection
Output frequency
Carrier frequency
45
6-