Motor Connection - ABB ACS260-04 Series User Manual

28 Electrical installation
in some cases type aR fuses may be required. The operating time of the fuses
must be below 0.5 seconds.
• Where allowed by local regulations, suitably dimensioned type B MCB circuit
breakers of equivalent rating may be utilised in place of fuses, providing that the
clearing capacity is sufficient for the installation.
• The maximum permissible short circuit current at the ACS260 Power terminals as
defined in IEC60439-1 is 5kA.

Motor Connection

• The drive inherently produces fast switching of the output voltage (PWM) to the
motor compared to the mains supply, for motors which have been wound for
operation with a variable speed drive then there is no preventative measures
required, however if the quality of insulation is unknown then the motor
manufacturer should be consulted and preventative measures may be required.
• The motor should be connected to the ACS260 U, V, and W terminals using a
suitable 3 or 4 core cable. Where a 3-core cable is utilised, with the shield
operating as an earth conductor, the shield must have a cross sectional area at
least equal to the phase conductors when they are made from the same material.
Where a 4-core cable is utilised, the earth conductor must be of at least equal
cross-sectional area and manufactured from the same material as the phase
conductors.
• The motor earth must be connected to one of the ACS260 earth terminals.