16 EN
MASTERYS BC+ 10-40 kVA - IOMMASBCXX0G-EN 02 - SOCOMEC
4.3.1 Backfeed protection
The UPS is set up for the installation of external protection devices against the backfeed of dangerous voltages, on both
the input power supply line (MAINS SUPPLY) and on the auxiliary backup mains power supply line (AUXILIARY MAINS
SUPPLY); these devices are controlled by means of the card shown in figure.
The current rating of the switching device has to follow the instruction outlined in 'Electrical requirements' chapter.
DANGER! RISK OF ELECTRIC SHOCK!
The installer must attach the warning label in order to warn electrical technicians about dangerous
backfeed situations (not caused by the UPS).
Warning label (supplied with the equipment) Backfeed electrical diagram
Before working on this circuit
- Isolate the Uninterruptible Power System (UPS)
- Then check for Hazardous Voltage between all terminals
including the protective earth
Risk of Voltage Backfeed
B
L1
L2
L3
N
UPS output
voltage
Backfeed Card
Dry Contact
Backfeed trip coils supply
COM2 NC2 NO2 NO1 COM1 NC1
MAINS BACKFEED AUXILIARY BACKFEED
NOTE: Use a 220-240 V trip coil with integrated travel limit contact to pilot the input/auxiliary protection
systems. If a trip coil without an integrated end of travel contact is used, a normally open contact must
be added. Electrical contact data: 1.6 A 250 V AC.
As an option the unit can be delivered with the integrated internal backfeed switches. Refer to 'Standard features and
option' chapter.
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