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
Summary of Contents for ACQ800 Series
Page 1: ...Hardware Manual ACQ800 37 Drives 55 to 450 kW 75 to 550 hp ACQ800 ...
Page 4: ......
Page 12: ...12 ACQ800 37 Hardware Manual Safety instructions ...
Page 24: ...24 ACQ800 37 Hardware Manual About this manual ...
Page 52: ...52 ACQ800 37 Hardware Manual Mechanical installation ...
Page 78: ...78 ACQ800 37 Hardware Manual Electrical installation ...
Page 84: ...84 ACQ800 37 Hardware Manual Motor control and I O board RMIO ...
Page 92: ...92 ACQ800 37 Hardware Manual Installation checklist and start up ...
Page 106: ...106 ACQ800 37 Hardware Manual Maintenance 3 4 5 6 8 7b 7a ...
Page 107: ...ACQ800 37 Hardware Manual 107 Maintenance 9 10 11 View from back ...
Page 123: ...ACQ800 37 Hardware Manual 123 Technical data Declaration of Conformity ...
Page 124: ...124 ACQ800 37 Hardware Manual Technical data ...
Page 128: ...128 ACQ800 37 Hardware Manual Dimensions Frame R6 ...
Page 129: ...ACQ800 37 Hardware Manual 129 Dimensions Frame R6 continued ...
Page 130: ...130 ACQ800 37 Hardware Manual Dimensions Frame R7i ...
Page 131: ...ACQ800 37 Hardware Manual 131 Dimensions Frame R7i continued ...
Page 132: ...132 ACQ800 37 Hardware Manual Dimensions Frame R7i continued ...
Page 133: ...ACQ800 37 Hardware Manual 133 Dimensions Frame R7i continued ...
Page 134: ...134 ACQ800 37 Hardware Manual Dimensions Frame R8i ...
Page 135: ...ACQ800 37 Hardware Manual 135 Dimensions Frame R8i continued ...
Page 136: ...136 ACQ800 37 Hardware Manual Dimensions Frame R8i continued ...
Page 137: ...ACQ800 37 Hardware Manual 137 Dimensions Frame R8i continued ...