0MNMPMK10NPENUB 00 Pag. 31 / 57
Procedure b)
The by-pass line is outside the acceptance field; the following message is seen on the
display panel:
BYPASS VOLTAGE FAIL or SWBY
1) open all the switches on the device (SWIN, SWOUT, SWBY and the battery cabinet
disconnectors/fuses). The control panel will remain off.
2) before closing switch SWMB to connect the loads, ensure that both the frequency and voltage of
the supply line are sufficient to power the connected loads.
N.B.: After carrying out the operations indicated above, personnel must wait around ten minutes for the
capacitors to discharge before working on the inside of the equipment.
After all the maintenance operations, restart the UPS following the instructions in the section on START-UP
PROCEDURE (see page 26). Then open disconnector SWMB (if it was previously closed).
The UPS will return to NORMAL OPERATION.
3.9 UPS and load shutdown
This operation will cause the shutdown of the load connected on the output. In parallel versions each procedure must
be carried out on all the UPSs:
open the battery cabinet switch/fuse.
open the switch of the load;
open SWOUT, output disconnector;
open SWIN, input disconnector;
open SWBY, by-pass line disconnector;
The load is no longer powered, and after a few seconds the signal panel will also shut down.
Use a multimeter to check that no voltages are present on the terminal board.
N.B.: the neutral is not interrupted by the UPS (the input neutral is also present at the UPS output).
Follow the instructions in the section on START-UP PROCEDURES (see page 26) to restart the UPS.
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