0MNMHEM30RUENUB 00 pag. 31 / 57
Procedure a)
the bypass line is present and its frequency and voltage are suitable the UPS display panel
indicates NORMAL OPERATION.
1. Pressing keys 3, 6, 4, 7, 2, 6, 3 in succession as shown on the display activates the command
for bypass with shutdown of the inverter;
2. close disconnecting switch SWMB;
3. open all the switches on the device (SWIN, SWOUT, SWBY and the battery cabinet
disconnectors/fuses) and keep only disconnecting switch SWMB (maintenance bypass line)
closed. The control panel remains off.
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 UPS.
In this situation (during maintenance
operations), any disturbance (such
as a blackout) on the UPS supply
line would have an effect on the
equipment powered (since the
batteries are deactivated in this
state).
Procedure b)
The bypass line is outside the acceptance field; the following message is seen on the display panel:
BYPASS VOLTAGEFAIL or SWBY OFF and green LED 1 will flash
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 MASTER HE will return to NORMAL OPERATION.
3.8 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 switch of the load;
open SWOUT, output disconnector;
open SWIN, input disconnector;
open SWBY, bypass line disconnector;
open the battery cabinet switch/fuse.
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.
Follow the instructions in the section on START-UP PROCEDURES (see page 26) to restart the UPS.
SWBY
SWIN
SWMB
Mains AC
Bypass AC
Load
SWOUT
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