Power Factor Compensation Capacitors; Equipment Connected To The Motor Cable; Installation Of Safety Switches, Contactors, Connection Boxes, Etc; Bypass Connection - ABB ACS800-07-0610-3 Hardware Manual

Power factor compensation capacitors

Power factor compensation is not needed with AC drives. However, if a drive is to be
connected to a system with compensation capacitors already installed, note the
following restrictions.
WARNING! Do not connect power factor compensation capacitors to the motor
cables (between the drive and the motor). They are not meant to be used with AC
drives and can cause permanent damage to the drive or themselves.
If there are power factor compensation capacitors in parallel with the three-phase
input of the drive:
• Do not connect a high-power capacitor to the power line while the drive is
connected. The connection will cause voltage transients that may trip or even
damage the drive.
• If capacitor load is increased/decreased step by step when the AC drive is
connected to the power line, ensure that the connection steps are low enough not
to cause voltage transients that would trip the drive.
• Check that the power factor compensation unit is suitable for use in systems with
AC drives, i.e. harmonic-generating loads. In such systems, the compensation
unit should typically be equipped with a blocking reactor or harmonic filter.

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 between the drive and the
motor:
• EU: Install the equipment in a metal enclosure with 360 degrees grounding for the
shields of both the incoming and outgoing cables, or in another way connect the
shields of the cables 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 an output contactor (in DTC motor control mode)

Stop the drive and wait for the motor to stop before opening a contactor between the
output of the drive and the motor when the DTC control mode is selected. (See the
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Planning the electrical installation
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