03 POWER ELECTRONICS AND CABINET FEATURES
3BHS213401 E01 REV H ACS1000 AIR-COOLED USER MANUAL 33/184
3.3.1 Main power supply configurations
The drive is connected to the main power supply via a three-winding oil or
dry-type transformer.
3.3.2 Auxiliary power supply configurations
The total auxiliary power demand of the drive includes:
- Auxiliary power for the cooling system
- Auxiliary power for the control hardware and the gate units which are used to trigger the
power semiconductors
The total auxiliary power can be fed to the drive in the following ways:
- Through a common power supply
• The total auxiliary power is supplied to the drive by a three-phase AC power supply.
• If the power supply is interrupted, drive internal batteries provide a backup for the
control system, thus enabling the drive to ride-through and/or to perform a controlled
shutdown.
- Through separate power supplies
• The auxiliary power is supplied to the drive by a three-phase AC power supply and by an
UPS to a separate one-phase AC or DC input.
• Feeding the control power separately by an UPS has the advantage that the main control
hardware will remain energized, the full ride-through capabilities of the drive can be
used, and the communication to a higher-level control system will not be lost in the
event of an auxiliary power outage.
Important: The power feed for the auxiliary supply must be protected with a suitable circuit
protection rated for the inrush current.
3.4 Drive topology
This section describes the main design features and introduces the major power electronics
components of a typical drive.
- For more information on the auxiliary power interface of the drive, see Appendix
D – Wiring diagrams.
- For information on the rated voltage(s) and current(s), see the rating plate of
the drive.
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