LEGRAND BSK93, Operating Manual

Page: 384 / 1398

Installation and start-up of KEOR HPE UPS 200-250-300 kVA
Installation et démarrage de l’ASI KEOR HPE 200-250-300 kVA
Installazione e avviamento KEOR HPE UPS 200-250-300 kVA
32 OMP06262 REV. B
4.2 BACKFEED PROTECTION DEVICE
The KEOR HPE UPS is provided with voltage-free contacts which can be used to operate the shunt
trip coil of the external sectioning device; the external device is not part of the UPS supply and is
provided and installed at customer care.
To prevent any risk of hazardous voltage or hazardous energy present in the circuits supplying the
UPS after interruption of the input AC power , a backfeed insulating device should be installed
external to the UPS in the by pass input switchboard . This protection can be coupled with the by
pass line overcurrent protection using a MCCB equipped with a shunt trip coil and connected to
UPS applying the wiring diagram principle described in Figure 6.
In case of backfeed failure detected by the UPS , the UPS will send a signal to trip the MCCB to
isolate the UPS in order to protect the upstream distribution circuits .
The installer shall apply the following warning label on all primary power isolator that supplies the
UPS installed remote to the UPS.
The following table shows the main electrical characteristics of the external sectioning device.
Backfeed protection device
Power (kVA) 200 250 300
Maximum operating voltage (Vac) 690 690 690
Minimum rated current (A) 400 500 600
Category AC-1 AC-1 AC-1
An isolator switch with integrated undervoltage release can beinstalled inside the UPS as an option.
Before working on this circuit
- I solate un i nterrupt i b l e power system (UPS)
- T hen check for hazardous vo l tage between a l l term i nals
i nclud in g th e protective earth
Risk of Voltage Backfedd