Equipment Connected To The Motor Cable; Installation Of Safety Switches, Contactors, Connection Boxes, Etc; Bypass Connection; Before Opening A Contactor (Dtc Control Mode Selected) - ABB ACS800-U4 Hardware Manual

Equipment connected to the motor cable

Installation of safety switches, contactors, connection boxes, etc.

To minimize the emission level when safety switches, contactors, connection boxes
or similar equipment are installed in the motor cable (i.e. between the drive and the
motor):
• EU: Install the equipment in a metal enclosure with 360 degrees grounding for the
screens of both the incoming and outgoing cable, or connect the screens of the
cables otherwise together.
• US: Install the equipment in a metal enclosure in a way that the conduit or motor
cable shielding runs consistently without breaks from the drive to the motor.

Bypass connection

WARNING! Never connect the supply power to the drive output terminals U2, V2
and W2. If frequent bypassing is required, employ mechanically connected switches
or contactors. Mains (line) voltage applied to the output can result in permanent
damage to the unit.

Before opening a contactor (DTC control mode selected)

Control the output voltage of the drive to zero before opening a contactor between
the output of the drive and the motor when the DTC control mode is selected. See
the appropriate ACS800 application program firmware manual for the required
parameter settings. Otherwise, the contactor will be damaged. In scalar control, the
contactor can be opened with the drive running.
Electrical installation planning
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