Riello UPS MASTER HE - Page 48

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4. open all the switches on the device (SWIN, SWOUT, SWBY and the battery cabinet
disconnectors/fuses) and keep only disconnectors SWMB (maintenance bypass line) closed. The
control panel remains off.
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 MASTER HP.
In this situation (during the 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:
BAD BYPASS VOLTAGE or SWBY OFF
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 switches SWMB and connecting 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 MASTER HE .
After the maintenance operations have finished, restart the UPS by following the instructions in the section on
START-UP PROCEDURE (see page 44) and then open disconnector SWMB (if closed).
The MASTER HE will return to NORMAL OPERATION.
Insertion and removal with UPSs operating (hot swap)
The hot insertion and removal of the UPS can only take place if the system is configured with the RJ45
female/RJ45 female shielded adaptor cable (as shown in the figures below).
The hot insertion and removal of the UPS makes technical support easier and improves the reliability of the system.
With this procedure it is not necessary to shut down all the UPSs in order to add or remove a unit.
Hot insertion and removal can only be done on systems comprising UPSs with the following characteristics:
The UPS system must be prearranged with a distribution panel (for power connections)
The UPS system must be prearranged with a RJ45 female/RJ45 female shielded adaptor cable (not provided with the
UPS). All the UPSs in the system must have the same firmware version.
MHT
MHT
Bypass AC
Mains AC
load
Mains AC
Mains AC
SWIN
SWOUT
SWMB
SWBY
SWOUT
SWOUT
SWMB
SWBY
SWIN
SWBY
SWMB
SWIN
MHT