0MNMHEM30RUENUB 00 pag. 17 / 57
3.2 Mains, load and battery connections
The operations described in this chapter must be carried out exclusively by a specialized technician. The
first connection to be made is the earth conductor.
The MASTER HE MUST NOT OPERATE WITHOUT AN EARTH CONNECTION
Connecting the UPS: Ensure that the earth conductor is connected first.
Disconnecting the UPS: Ensure that the earth conductor is removed last
Before making the connection, open all the switches on the device and ensure that the UPS is completely isolated
from the power sources: battery and AC power line. More specifically, check that:
- the UPS input line or lines are completely isolated;
- the battery cabinet disconnector / fuse (if present) is open;
- all the UPS disconnectors - SWIN, SWBY, SWOUT and SWMB - are in the open position (position 0);
- check with a multimeter that there are no dangerous voltages on the terminal board.
For connection of the power cables to the terminal boards, refer to the “INSTALLATION DRAWINGS”
provided with the UPS and with the battery cabinet, if present.
INPUT NEUTRAL
The power supply to the MASTER HE input ( bypass line) must be three-phase with neutral.
The neutral conductor is necessary only on bypass line.
Input line without neutral
The transformer must be inserted either on the mains supply line or on the bypass line (as shown in the drawings).
MAINS LINE
UPS
LOAD
3Ph+N
or
OPTIONAL
MAINS LINE
UPS
LOAD
3Ph+N
BY-PASS LINE
or
OPTIONAL
Single power line without neutral
main power supply and separate bypass without neutral
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