A Pre-charging contactor control B Main input device control
C -QA6, Pre-charging contactor coil D -QA3, Mains contactor coil
E I/O and Relay Option F Short-circuit protected supply
9.3.7 The Pre-charging Function
To avoid high inrush current to drive capacitors, pre-charge the drive before switching on main power.
The pre-charging function uses AFE control unit I/Os and relays. Pre-charging can be operated either locally (manually or automatically)
or remotely (manually). The pre-charging circuit is protected by fuses installed in the fuse base (AE10, E10) or the fuse switch (AE11, IE11).
Check that the mains 0-enable switch is in the 0 position. With 590 A drives and larger, close the pre-charging fuse switch (-QB6). After
that, if the drive has a main switch (-QB0), close it. Check that all miniature circuit breakers are closed.
Manual operation
Turn the pre-charging MAN-AUTO switch (-SF12) to the manual position. Turn the mains 0-enable switch (-SF11) to the enable position.
Pre-charging starts by pressing the Run button on the control panel of the AFE module. The pre-charging contactor closes. When pre-
charging is done, the main input device closes and the pre-charging contactor opens. Perform pre-charging again after a power outage.
Automatic operation
Pre-charging starts automatically when pre-charging is enabled with mains 0-enable switch and pre-charging MAN-AUTO switch is in
the auto position. The pre-charging contactor closes. When pre-charging is done, the main input device closes and the pre-charging
contactor opens. Pre-charging is performed automatically after a power outage.
Remote operation
Turn the pre-charging MAN-AUTO switch to the manual position. Turn the mains 0-enable switch to the enable position. Pre-charging
starts by activating Digital Input 1. The AFE starts and the pre-charging contactor closes. When pre-charging is done, the main input
device closes and the pre-charging contactor opens. Perform pre-charging again after a power outage.
9.4 Options
9.4.1 Available Options for the Enclosed Drives
Table 39: Options for the Enclosed Drives
Option group Plus code Description
+GACO Mains contactor
+GAMS Main switch
Input options
+GACB Air circuit breaker fixed
Grounding device +GCEP Provision for grounding device
Motor heater control +IAMH Motor heater control
Cabinet heater +IBCH Cabinet heater
106 | Danfoss Drives Oy © 2024.09 AJ389643274589en-000101 / 172F6409A
Design Guide | iC7-Automation Air-cooled Enclosed Drives Specifications
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