APC 10-40kW 208/480V Installation Guide download pdf (Page 49)

49Installation Guide Silcon DP300E 208V/480V 10-80 kVA

7OY0002 US rev. 04

Options/Accessories

8.0 Options/Accessories

8.1 Parallel/Redundant operation

The parallel board.

Introduction.

The parallel board establishes the possibility to connect two or more systems in

parallel - either to obtain increased security or to obtain higher total output power.

Among other functions the parallel board ensures a correct load sharing between the

parallel connected systems.

Control cables.

The external multicable is terminated with a 15 pin SUB-D plug in both ends. Pin 1

to pin 1, pin 2 to pin 2, and so on up to pin 15 - except pin 8, which is not connected.

Shield is connected to plug cover in both ends.

The terminals X020 and X021 for the control cables are situated on the parallel

board. X020 in UPS1 is connected to X021 in UPS2, X020 in UPS2 is connected to

X021 in UPS3 and so on. X020 in last UPS is connected to X021 in UPS1.

Power cables.

To optimize load sharing in parallel operation the external power circuits must be

“symmetrical”, i.e. power input cables must have same lengths and cross-sections

and the same for output cables.

NOTE:

Do only use the original control

cable delivered with the parallel

board.

NOTE:

The control cables must be

separated from the AC and DC

power cables.

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APC 10-40kW 208/480V Installation Guide Page 49