Yaskawa F7 Drive Programming Manual - Manual (Page 43)

Programming 35
C6 Carrier Frequency
C6-01 Normal Duty Selection
The Drive’s capacity is categorized based on three types of load characteristics: Heavy Duty, Normal Duty 1, and Normal Duty 2. The
F7 User’s and Programming Manual will only provide details on Heavy Duty and Normal Duty, where Normal Duty = Normal Duty 2
rating. Normal Duty 1 and Normal Duty 2 is only referenced wherever parameter C6-01 selections are mentioned in the manuals. This
section explains the differences between Heavy Duty, Normal Duty 1, and Normal Duty 2. Adjustment of parameter C6-01 will affect
the Drive’s rated current, overload capacity, current limit, carrier frequency, and maximum output frequency.
The table below describes the general differences between Heavy Duty, Normal Duty 1, and Normal Duty 2. The Drive’s nameplate
shows the Heavy Duty and Normal Duty 2 current ratings. Normal Duty 1 is not printed on the nameplate, but its current rating is the
same as Heavy Duty (HD).
Normal Duty 1 is the only rating that allows the carrier frequency to be increased above factory default setting. When the carrier
frequency (C6-02) is set above the factory default setting in Normal Duty 1 (C6-01 = 1), the Drive’s output current must be
derated. Please consult Yaskawa for details on derating.
C6-02 Carrier Frequency Selection
Parameter C6-02 sets the switching frequency of the Drive’s output transistors. It can be changed in order to reduce audible
noise and also reduce leakage current. Cases that may require adjustment to the C6-02 are:
Setting Description
0 Heavy Duty (factory default)
1 Normal Duty 1
2 Normal Duty 2
Table 1 Drive Duty Selection
Parameter
C6-01
Rated Output
Current
Overload
Capacity
Current
Limit
Carrier
Frequency
Maximum Output
Frequency
0: Heavy Duty
(default)
Heavy Duty (HD)
Nameplate Rating
(varies by model*)
150% for 1 min. 150%
Low
(2kHz)
300 Hz
1: Normal Duty 1
Heavy Duty (HD)
Nameplate Rating
(varies by model*)
120% for 1 min. 120%
High
(varies by model*)
400 Hz
2: Normal Duty 2
Normal Duty (ND)
Nameplate Rating
(varies by model*)
Approx. 110% for 1 min.
(varies by model*)
120%
Moderate
(varies by model*)
400 Hz
* See specification in the F7 Drive Users Manual (TM.F7.01)for details.
Setting Description
0 Low Noise
1 Fc=2.0 kHz
2 Fc=5.0 kHz
3 Fc=8.0 kHz
4 Fc=10.0 kHz
5 Fc=12.5 kHz
6 Fc=15.0 kHz
F Program
*The factory default setting is model dependent