ABB ACS550-02 User Manual page 14

12
Power Factor Compensation Capacitors
Do not connect power factor compensation capacitors or capacitive surge absorbers
to the motor cables (between the drive and the motor). They are not designed to be
used with drives, and will degrade motor control accuracy. They can cause
permanent damage to the drive or themselves due to the rapid changes in the drive
output voltage.
If there are power factor compensation capacitors in parallel with the three phase
input of the drive, ensure that the capacitors and the drive are not charged
simultaneously to avoid voltage surges which might damage the unit.
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, Sensorless Vector Control (SVC) Mode Selected
If an output isolator or contactor is used, supply either stop signal or RUN ENABLE
(see parameter 1601) signal from an auxiliary contact of the isolator to the ACS550,
in order to make sure that the ACS550 will coast to stop immediately when the
isolator opens. Improper use of the isolator may damage the ACS550 and the
isolator itself.
Installation