IV404E Rev.000 SIEL S.p.A.
Issue date: 2017-06-05 Pag. 47 di 90 + FR
- SAFEPOWER EVO HFT in NORMAL OPERATION
procedure a)
the power supply to the load is not interrupted in any way
;
- SAFEPOWER EVO HFT with output not synchronized with the by-pass line
procedure b)
the power supply to the load is interrupted
(therefore this operation should be effected only if absolutely necessary).
Procedure a)
the by-pass 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 by-pass 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 by-pass
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).
