ACQ800-37 Hardware Manual
57
Planning the electrical installation
Note 8:
Calculating the rise time and the peak line-to-line voltage
The peak line-to-line voltage at the motor terminals generated by the drive as well as the voltage rise
time depend on the cable length. The requirements for the motor insulation system given in the table
are “worst case” requirements covering installations with 30 m (98 foot) and longer cables. The rise
time can be calculated as follows: t = 0.8 ·
Û
LL
/(du/dt). Read
Û
LL
and du/dt from the diagrams below.
Multiply the values of the graph by the supply voltage (
U
N
). In case of drives with an IGBT supply unit or
resistor braking, the
Û
LL
and du/dt values are approximately 20% higher.
Note 9:
Sine filters
Sine filters protect the motor insulation system. Therefore, a du/dt filter can be replaced with a sine
filter. The peak phase-to-phase voltage with a sine filter is approximately 1.5 ×
U
N
.
Û
LL
/
U
N
Without du/dt Filter (all frame sizes)
Cable length (m)
du/dt
U
N
-------------(1/
μ
s)
1.0
2.0
5.0
4.0
3.0
1.5
2.5
3.5
4.5
100
200
300
100
200
300
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Cable length (m)
With du/dt Filter (R6 and R7i)
du/dt
U
N
-------------(1/
μ
s)
Û
LL
/
U
N
5.5
100
200
300
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Cable length (m)
With du/dt Filter (R8i and nxR8i)
du/dt
U
N
-------------(1/
μ
s)
Û
LL
/
U
N
Содержание ACQ800 Series
Страница 1: ...Hardware Manual ACQ800 37 Drives 55 to 450 kW 75 to 550 hp ACQ800 ...
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Страница 12: ...12 ACQ800 37 Hardware Manual Safety instructions ...
Страница 24: ...24 ACQ800 37 Hardware Manual About this manual ...
Страница 52: ...52 ACQ800 37 Hardware Manual Mechanical installation ...
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Страница 84: ...84 ACQ800 37 Hardware Manual Motor control and I O board RMIO ...
Страница 92: ...92 ACQ800 37 Hardware Manual Installation checklist and start up ...
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Страница 107: ...ACQ800 37 Hardware Manual 107 Maintenance 9 10 11 View from back ...
Страница 123: ...ACQ800 37 Hardware Manual 123 Technical data Declaration of Conformity ...
Страница 124: ...124 ACQ800 37 Hardware Manual Technical data ...
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