X1
X2
X3
X51
71
TI+
72
TI-
1
COM
2
NO
3
NC
4
COM
5
NO
6
NC
8
NO
7
COM
A1
A2
-QA6
A1
A2
-QA3
23
24
-SF11
115...
230 VAC
N
1
2
3
4
e3
0b
i2
70
.1
1
Figure 100: Pre-charging Control Wiring Diagram
1
Short-circuit protected
2
Pre-charging contactor control
3
Main input device control
4
Basic I/O of the control unit of the AFE module
10.3.7
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 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
10.3.6 Pre-charging Control Wiring Diagrams
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 AJ389643111587en-000101 / 172F6361A
Design Guide | iC7 Series Air-cooled System Modules