To comply with European Union directives and United Kingdom regulations related
to standard EN 60204-1, the disconnecting device must be one of these types:
• switch-disconnector of utilization category AC-23B (IEC 60947-3)
• disconnector that has an auxiliary contact that in all cases causes switching
devices to break the load circuit before the opening of the main contacts of
the disconnector (EN 60947-3)
• circuit-breaker suitable for isolation in accordance with IEC 60947-2.
Selecting the main contactor
You can equip the drive with a main contactor.
Follow these guidelines when you select a customer-defined main contactor:
• Dimension the contactor according to the nominal voltage and current of the
drive. Also consider the environmental conditions such as surrounding air
temperature.
• IEC installations: Select contactor with utilization category AC-1 (number of
operations under load) according to IEC 60947-4.
• Consider the application life time requirements.
Examining the compatibility of the motor and drive
Use asynchronous AC induction motors, permanent magnet synchronous motors
or ABB synchronous reluctance motors (SynRM motors) with the drive.
Select the motor size and drive type from the rating table on basis of the AC line
voltage and motor load. You can find the rating table in the appropriate hardware
manual. You can also use the DriveSize PC tool.
Make sure that the motor can be used with an AC drive. See Requirements
tables (page 97). For basics of protecting the motor insulation and bearings in
drive systems, see Protecting the motor insulation and bearings (page 96).
Note:
• Consult the motor manufacturer before using a motor with nominal voltage
that differs from the AC line voltage connected to the drive input.
• The voltage peaks at the motor terminals are relative to the supply voltage of
the drive, not to the drive output voltage.
￭
Protecting the motor insulation and bearings
The drive employs modern IGBT inverter technology. Regardless of frequency, the
drive output comprises pulses of approximately the drive DC bus voltage with a
very short rise time. The pulse voltage can almost double at the motor terminals,
depending on the attenuation and reflection properties of the motor cable and
96 Guidelines for planning the electrical installation
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