Hitachi SJ7002 Series Instruction Manual page 103

3–20
"A" Group: Standard Functions
Max.
100
braking
90
ratio (%)
80
70
60
50
40
30
20
10
Frequency-
related Functions
Func. Name/
Code SRW Display
A061 Frequency upper limit setting
Sets a limit on output frequency less
than the maximum frequency (A004)
A261 Frequency upper limit setting, 2nd
motor
Sets a limit on output frequency less
than the maximum frequency (A004)
A062 Frequency lower limit setting
Sets a limit on output frequency
greater than zero
A262 Frequency lower limit setting, 2nd
motor
Sets a limit on output frequency
greater than zero
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Derating of DC Braking – The inverter uses an internal carrier frequency (set by A059) to
generate a DC braking voltage (do not confuse with main inverter output carrier frequency set
by B083). The maximum DC braking force available to the inverter is more limited with higher
DC braking carrier frequency settings for A059 according to the graphs below.
Models 0.4 – 55kW
(75)
(46)
(34)
(22)
3 5 7 9 11 13
DC braking carrier frequency
Frequency Limits – Upper and lower
limits can be imposed on the inverter
output frequency. These limits will apply
regardless of the source of the speed
reference. You can configure the lower
frequency limit to be greater than zero as
shown in the graph to the right. The upper
limit must not exceed the rating of the
motor or capability of the machinery.
Keypad
SRW
0000.00
0000.50 >0.50 Setting is enabled,
0000.00
0000.50 >0.50 Setting is enabled,
0000.00
0000.50 >0.50 Setting is enabled,
0000.00
0000.50 >0.50 Setting is enabled,
Models 75 – 150kW
Max.
100
braking
90
ratio (%)
80
70
(60)
60
50
40
30
20
(10)
10
15 kHz 3 5
DC braking carrier frequency
Output frequency
Upper
A061
limit
Lower
A062
limit
Range and settings
OPE
0.00 Setting is disabled
0.50 to 400.0 (Hz)
0.00 Setting is disabled
0.50 to 400.0 (Hz)
0.00 Setting is disabled
0.50 to 400.0 (Hz)
0.00 Setting is disabled
0.50 to 400.0 (Hz)
Models 185 – 4000kW
Max.
100
braking
90
ratio (%)
80
70
60
50
(40)
40
(35)
30
(20)
20
(10)
10
7 9 10 kHz
DC braking
carrier frequency
Frequency command
Defaults
FEF2 FUF2 FF2
FE2 FU2
(EU) (USA) (Jpn)
0.00 0.00 0.00
0.00 0.00 0.00
0.00 0.00 0.00
0.00 0.00 0.00
3 kHz
Settable
range
Run
Mode
Edit
F2
Lo Hi
✘ ✔
✘ ✔
✘ ✔
✘ ✔
✘ ✔
✘ ✔
✘ ✔
✘ ✔