Design Guide | iC7 Series Liquid-cooled System Modules
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
10.3.10 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 or GC control unit I/Os and relays. The pre-charging function requires auxiliary voltage for the
control unit and the pre-charging circuit. Pre-charging can be operated either locally (manually or automatically) or remotely (manually).
Pre-charging is enabled by activating Digital Input 2. Select the MANUAL or AUTO mode by activating/deactivating Digital Input 3
(activated = AUTO). Select remote operation by activating Digital Input 1. Connect the input device, the contactor, or the circuit breaker,
the auxiliary contacts to the control unit as described in Figure 166. Connect also the cooling supervision signal from the cooling module
if possible. The charging circuit is protected by fuses installed in the fuse-switch disconnector. Turn the switch ON.
Manual operation
Enable pre-charging and switch it to MANUAL mode. Pre-charging starts by pressing the Run button on the control panel of the AFE or
grid converter module. The pre-charging contactor closes. When charging is done, the main input device closes and the pre-charging
contactor opens. Charging must be performed again after a power outage.
Auto operation
Enable pre-charging and switch it to AUTO mode. Pre-charging starts immediately. The pre-charging contactor closes. When charging is
done, the main input device closes and the pre-charging contactor opens. Charging is performed automatically after a power outage.
Remote operation
Enable pre-charging and set it to MANUAL mode. Pre-charging starts by activating Digital Input 1. The AFE or grid converter module
starts and the pre-charging contactor closes. When charging is done, the main input device closes and the pre-charging contactor opens.
Charging must be performed again after a power outage.
Danfoss Drives Oy © 2024.03 AJ475942178716en-000101 / 172K2848A | 165
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