LEGRAND Keor MOD 100, Installation And Maintenance Manual, Page: 41 / 100

Keor MOD
Installa
tion and main
tenanc
e manual
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4.2.7 Bypass cables installation
The default configuration has the input line in common with the bypass line through a metal jumper.
If no change is required, follow the steps indicated in the previous paragraph.
To perform a dual input installation with a separate bypass line, the following requirements must be met:
- the two lines must be supplied by the same MV/LV transformer source (same electrical potential). If this is not the case,
an insulation transformer should be added in the bypass line upstream the UPS;
- separate protective devices are required for each line.
The UPS does not modify the neutral configuration of the system. The mains, bypass and output neutral are connected
internally to each other.
Before the installation of the bypass cables, check the following:
- the bypass line must be able to provide a voltage of 400 V + 15% - 20%;
- the available bypass power must be at least the same of the UPS nominal power;
- the cables to connect to the UPS must be isolated upstream and no voltage must be present;
- the earthing cable from the low voltage switchgear must be properly connected (see paragraph 4.2.3).
WARNING
The neutral bypass cable must always be connected.
KEOR MOD 125
In case the bypass line is separated from the input line, follow these steps:
- remove the metal jumper that connects the input line with the bypass line;
- crimp the bypass and neutral cables with M8 eyelets;
- connect the bypass cables L1, L2, L3 to the terminals BYP L1, BYP L2, BYP L3 of the bypass busbar using three hex M8x20
screws along with M8 flat washers and M8 grower washers. The grower washer must always be put on top of the flat
washer;
- do not change the phase sequence (L1, L2, L3);
- connect the bypass neutral cable to the neutral busbar with a hex M8x20 screw along with a M8 flat washer and a M8
grower washer. The grower washer must always be put on top of the flat washer.
KEOR MOD 125 – bypass cables installation with input line separated from the bypass line