4-18
CAUTION
Maximum frequency
Set the maximum frequency value of the inverter.
This set value is the maximum frequncey that the inverter will achieve when
It receives top speed reference from the control terminalsor the digital operator.
To the change the 1
st
/2
nd
maximum frequency, set an intelligent
input terminal to 08(SET) and switch the input ON.
The Inverter output voltage from the base frequencey to the
maximum frequency is the same level as the voltage
selected on the motor voltage selection.
Function code
Limit of setting
Contents
A004/A204
30.-400.
Unit : Hz
Carrier frequency
The carrier frequency of the PWM wave-form output from the inverter is adjustable
by changing b083.
If the carrier frequency is set higher, the audible noise from motor will be reduced
but the RFI noise and the leakage current may be increased.
This function may help to avoid the resonant frequency of
the motor or the mechanical system.
(Note 1) The maximum value of the carrier frequency in order to achieve full output current is different
depending on the capacity. When raising the carrier frequency, the rated output current will be reduced.
Voltage
class
200V class
400V class
Contents
(kW)
Maximum carrier
frequency
(kHz)
Derating on carrier
frequency =
12kHz
Maximum carrier
frequency
(kHz)
Derating on carrier
frequency
= 12kHz
(8kHz 90kW to 132kW)
11
12
100%
12
100%
15
12
100%
12
100%
18.5
10
90%
12
100%
22
4
80%
12
100%
30
3
70%
8
90%
37
8
80%
10
80%
45
10
95%
10
95%
55
6
75%
10
95%
75
3
70%
5
60%
90
–
–
6
95%
110
–
–
6
85%
132
–
–
6
85%
:
Be sure to keep the above-mentioned table.
Otherwise, there is a danger of inverter unit breakage.
When using at 50ºC of ambient air temperature, the rated output current will be
reduced as below (Fig.reference).
Chapter4 Explanation of function
Output voltage
Maxi mum frequency
Basic frequency
Motor Voltage
selection
（
100%)
A004/A204:
1
st
/2
nd
maximum
frequency
Relation code
b083: Carrier frequency
Relation code
0.5-12.0(Note 1)
Unit: kHz
(90 to 132kW)
Function code Limit of setting
Contents
b083
Unit: kHz
(11 to 75kW)
0.5-8.0(Note 1)
0.5 2 4 6 8 10 12
100%
95%
90%
85%
80%
75%
70%
65%
55%
60%
% of
Dri
v
e Rat
e
d
A
m
p
s
Carrier frequency (kHz)
450L,450H,550H
370L
110L,150L
110 to 220H
300H
550L
750H
185L
220L
300L,750L
370H
900H
1100H,1320H
185L,185H,220H
100%
95%
90%
85%
80%
75%
70%
65%
220L
150L,150H
450H
300H
370L
60%
55%
% of
Dri
v
e
Rat
e
d
Am
ps
110L,110H
750L,750H
550H
550L
370H
Carrier Frequency (kHz)
300L
900H
1100,1320H
Fig.reference: at 50ºC of ambient air temperature
450L
0.5 2 4 6 8 10 12
