Power Factor Compensation Capacitors; Equipment Connected To The Motor Cable; Installation Of Safety Switches, Contactors, Connection Boxes, Etc; Bypass Connection - ABB ACS800-04 Hardware Manual

Power factor compensation capacitors

Power factor compensation is not needed with AC drives. However, if a drive is to be
connected in a system with compensation capacitors installed, note the following
restrictions.
WARNING! Do not connect power factor compensation capacitors or
harmonic filters 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:
1. 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.
2. 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.
3. 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-degree grounding for the
shields of both the incoming and outgoing cable, or connect the shields 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. Mains (line) voltage applied to the output can result in
permanent damage to the unit. If bypassing is required, use mechanically or
electrically interlocked contactors between the motor and the drive and between the
motor and the power line. Make sure with interlocking that the contactors cannot be
closed simultaneously. The installation must be clearly marked as defined in IEC/EN
61800-5-1, subclause 6.5.3, for example, "THIS MACHINE STARTS AUTOMATICALLY".
Planning the electrical installation 57