Permanent Magnet Synchronous Motor - ABB ACS800 Hardware Manual

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Note 7: Drives with an IGBT supply unit
If voltage is raised by the drive (this is a parameter selectable function), select the motor insulation
system according to the increased intermediate circuit DC voltage level, especially in the 500 V supply
voltage range.
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 metre and longer cables. The rise time can
be calculated as follows:
the values of the graph by the supply voltage (U
braking, the Û
3.0
2.5
2.0
1.5
1.0
0.5
0.0
100
Note 9: Sine filters protect the motor insulation system. Therefore, du/dt filter can be replaced with a
sine filter. The peak phase-to-phase voltage with the sine filter is approximately 1.5 × U

Permanent magnet synchronous motor

Only one permanent magnet motor can be connected to the inverter output.
It is recommended to install a safety switch between the permanent magnet
synchronous motor and the drive output. The switch is needed to isolate the motor
during any maintenance work on the drive.
Planning the electrical installation
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t = 0.8 · Û
and du/dt values are approximately 20 % higher.
LL
Û /U
LL N
du/dt
------------ - (1/µs)
U
N
200 300
Cable length (m)
With du/dt Filter
/(du/dt). Read Û and du/dt from the diagrams below. Multiply
LL LL
). In case of drives with an IGBT supply unit or resistor
N
5.5
5.0
du/dt
------------ - (1/µs)
U
4.5
N
4.0
3.5
3.0
2.5
2.0
1.5
1.0
100
Without du/dt Filter
Û /U
LL N
200 300
Cable length (m)
.
N