The drive employs modern IGBT inverter technology. Regardless of frequency, the drive output comprises pulses of approximately the drive DC bus voltage with a very

short rise time. The pulse voltage can almost double at the motor terminals, depending on the attenuation and reflection properties of the motor cable and the

terminals. This can cause additional stress on the motor and motor cable insulation. Modern variable speed drives with their fast rising voltage pulses and high switching

frequencies can generate current pulses that flow through the motor bearings, which can gradually erode the bearing races and rolling elements.

There are optional common mode filters and du/dt filters available for the ABB drives. The common mode filters mainly reduce bearing currents. The du/dt filters

also protect the motor insulation system.

To avoid damage to motor bearings and insulation system:

• Select and install the cables according to the instructions given in the hardware

manual.

• Check if the installation needs to be equipped with additional protection

equipment, such as insulated N-end bearings in the motor, or the drive output

filters. The requirements are specified in the drive Hardware manual. See chapter

Planning the electrical installation.

68550505

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