Permanent Magnet Synchronous Motor; Supply Connection - ABB ACS800 Hardware Manual

Note 6: Resistor braking of the drive
When the drive is in braking mode for a large part of its operation time, the
intermediate circuit DC voltage of the drive increases, the effect being similar to
increasing the supply voltage by up to 20 percent. The voltage increase should be
taken into consideration when determining the motor insulation requirement.
Example: Motor insulation requirement for a 400 V application must be selected as if
the drive were supplied with 480 V.
Note 7: Drives with an IGBT supply unit
If voltage is raised by the drive (this is a parameter selectable function), select the
motor insulation system according to the increased intermediate circuit DC voltage
level, especially in the 500 V supply voltage range.

Permanent Magnet Synchronous Motor

Only one permanent magnet motor can be connected to the inverter output.
It is recommended to install a safety switch between the permanent magnet
synchronous motor and the motor cable. The switch is needed to isolate the motor
during any maintenance work on the drive.

Supply Connection

Disconnecting Device (Disconnecting Means)
ACS800-01, ACS800-U1, ACS800-02, ACS800-U2 without enclosure extension,
ACS800-04, ACS800-U4
Install a hand-operated input disconnecting device (disconnecting means) between
the AC power source and the drive. The disconnecting device must be of a type that
can be locked to the open position for installation and maintenance work.
ACS800-U2 with enclosure extension, ACS800-07, ACS800-U7, and ACS800-PC
These units are equipped with a hand-operated input disconnecting device
(disconnecting means) which isolates the drive and the motor from the AC power as
standard. The disconnecting device does not, however, isolate the input busbars
from the AC power. Therefore during installation and maintenance work on the drive,
the input cables and busbars must be isolated from the input power with a
disconnector at the distribution board or at the supplying transformer.
US
The disconnecting means must conform to the applicable safety regulations.
Fuses
See section "Thermal Overload and Short-Circuit Protection".
Planning the Electrical Installation
33