Permanent Magnet Motor - ABB ACS800 Series Hardware Manual

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Firmware manual (340 pages)

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Note 7: Resistor braking of the drive

When the drive is in braking mode for a large part of its operation time, the

intermediate circuit DC voltage of the drive increases, the effect being similar to

increasing the supply voltage by up to 20 percent. The voltage increase should be

taken into consideration when determining the motor insulation requirement.

Example: Motor insulation requirement for a 400 V application must be selected as if

the drive were supplied with 480 V.

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: t = 0.8 · Û

the values of the graph by the supply voltage (U

supply unit or resistor braking, the Û

higher.

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

Note 10: Common mode filter is available as a separate option.