page 54 / 85 0MLMHTM16RUENUB
Procedure b)
The bypass line is out of the range; the following message is shown on display panel:
BAD BYPASS VOLTAGE or SWBY OFF and the green LED 1 will flash
1.
Open all the switches on the UPS (SWIN, SWOUT, SWBY and the battery cabinet circuit
breaker/disconnect). The control panel will remain off.
2.
Before closing switches SWMB and connecting the loads, ensure that both the frequency and voltage of
the mains supply are sufficient to power the connected loads.
NOTE: After carrying out the operations indicated above, personnel must wait at least ten minutes for the
capacitors to discharge before working on the inside of the UPS.
After maintenance, restart the UPS by following the instructions in the section on START-UP PROCEDURE (see page
50) and then open SWMB (if closed).
The UPS will return to NORMAL OPERATION.
Insertion and removal with UPS’s 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 UPS’s in order to add or remove a unit.
Hot insertion and removal can only be done on systems comprising UPS’s 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 UPS’s in the system must have the same firmware version.
Example of hot insertion
A) UPS parallel cable type RJ45
B) RJ45 female/RJ45 female
shielded adaptor cable
UPS
BYPASS CABLE
II - Insert the new UPS (power
connections in the distribution
panel) and keep it switched off.
UPS 3: SW1 cont position.
III - Remove adaptor B and insert
the new UPS instead of the
adaptor
.
Now switch on UPS 3 (the added
UPS).
With the lever of SW1 in the start position in one UPS only and the lever in the cont position on all the others, check
that all the UPS’s are operating normally and that the system is sharing the output power.
Example of hot removal
UPS 3
A
UPS 1
A
UPS 2
A
I
II
III
B
UPS 1
UPS 2
UPS 3
UPS 1
UPS 2