Hitachi S1 Series Basic Manual page 100

S1 series standard inverter
Function
Name
code
Carrier frequency
P00.14
setup
Motor parameter
P00.15
autotuning
Detailed parameter description
Carrier
Electro magnetic
frequency
noise
1kHz
High
10kHz
15kHz
Low
The relation between the model and carrier
frequency is shown below.
Model
230V 0.4–2.2kW
0.75–11kW
400V 15–55kW
Above 75kW
Advantages of high carrier frequency are as
follows: ideal current waveform, few current
harmonics and small motor noise.
Disadvantages of high carrier frequency are as
follows: growing switch consumption, enlarged
temperature rise, impacted output capacity; under
high carrier frequency, the inverter needs to be
derated for use, meanwhile, the leakage current
will increase, which increases electromagnetic
interference to the surroundings.
While low carrier frequency is the contrary. Low
carrier frequency will cause unstable operation at
low frequency, decrease the torque, or even lead
to oscillation.
If the default carrier frequency is exceeded during
use, derating is required, derate by 10% for every
additional 1k carrier frequency.
Setting range: 1.2–15.0kHz
0: No operation
1: Rotary autotuning; carry out comprehensive
motor parameter autotuning; rotary autotuning is
used in cases where high control precision is
-95-
Noise and leakage Cooling
current
level
Low
High
Default value of
carrier
frequency
8kHz
8kHz
4kHz
2kHz
Default
Modify
value
Low
High
Depend
○
on
model
◎
0