Electrical Installation Planning; What This Chapter Contains; To Which Products This Chapter Applies; Checking The Compatibility Of The Motor - ABB ACS800-U4 Hardware Manual

Electrical installation planning

What this chapter contains

This chapter contains the instructions that you must follow when selecting the motor,
the cables, the protections, the cable routing and the way of operation for the drive
system. Always follow local regulations.
Note: If the recommendations given by ABB are not followed, the drive may
experience problems that the warranty does not cover.

To which products this chapter applies

This chapter applies to the ACS800-01/U1 and the ACS800-02/U2
04/U4.

Checking the compatibility of the motor

See Technical data for the drive ratings and the motor connection data.
WARNING! Operation is not allowed if the motor nominal voltage is less than 1/2 of
the drive nominal input voltage, or the motor nominal current less than 1/6 of the
drive nominal output current.

Protecting the motor winding and bearings

The output of the drive comprises – regardless of output frequency – pulses of
approximately 1.35 times the mains network voltage with a very short rise time. This
is the case with all drives employing modern IGBT inverter technology.
The voltage of the pulses can be almost double at the motor terminals, depending on
the motor cable properties. This in turn can cause additional stress on the motor
insulation.
Modern variable speed drives with their fast rising voltage pulses and high switching
frequencies can cause current pulses through the motor bearings which can
gradually erode the bearing races.
The stress on motor insulation can be avoided by using optional ABB du/dt filters.
du/dt filters also reduce bearing currents.
and the ACS800-
Electrical installation planning
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