The Pre-Charging Function - Danfoss iC7 Series Design Manual

Design Guide | iC7 Series Air-cooled System Modules
1
115...
230 VAC
-SF11
N
COM
Figure 100: Pre-charging Control Wiring Diagram
1
Short-circuit protected
3
Main input device control

The Pre-charging Function

10.3.7
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
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
116
| Danfoss Drives Oy © 2024.03
23
2
24
A1 A1
-QA6 -QA3
A2 A2
1 2 3 4 5 6
NO NC COM NO NC
X1 X2
3
7 8 71 72
COM NO TI+ TI-
X3 X51
2
Pre-charging contactor control
4
Basic I/O of the control unit of the AFE module
10.3.6 Pre-charging Control Wiring
4
Diagrams. Connect also the
AJ389643111587en-000101 / 172F6361A