Permanent Magnet Synchronous Motor - ABB ACS800 Hardware Manual

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
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

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 a permanent magnet
synchronous motor and the motor cable. The switch is needed to isolate the motor
during any maintenance work on the drive.
t = 0.8 · Û
LL
and du/dt values are approximately 20% higher.
LL
3.0
2.5
2.0
1.5
1.0
0.5
0.0
/(du/dt). Read Û and du/dt from the diagram below. Multiply
LL
). In case of drives with an IGBT supply unit or resistor
N
Û /U
LL N
du/dt
------------ - (1/μs)
U
N
100 200
Cable length (m)
With du/dt Filter
300
.
N
Planning the electrical installation
61