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2.4 Connecting the UPS Power Cables
WARNING!!! A separate power line should be used to supply the UPS AC input. Never use the same
line to supply another electrical device. Do not use any additional cable to increase the
length of the UPS’s input cable. It is advised to use an MCCB suitable for the input current
on the UPS’s input line.
The connection of the electrical panel should be supplied by a grounded outlet. Otherwise, the UPS
and the load connected to the output will be left ungrounded. The grounding system must
be checked, and must be strengthen if required. Potential difference between ground and
neutral must be less than 3V AC.
Descriptions of the UPS input output cable connection terminals are shown in figure 2.1
Recommended input line cable and fuse ratings are given in the table below.
UPS power
(kVA)
Recommended cable size (mm
2
)
Line input
Bypass input /
UPS output
External Battery
Input / output
Cable connections
U-V-W-N
Battery
connections
+ & -
20 16 16 16
16mm
2
terminal block
16mm
2
terminal block
30 25 25 25
25mm
2
terminal block
25mm
2
terminal block
40 25 25 25
25mm
2
terminal block
25mm
2
terminal block
NOTES:
The neutral conductor should be sized for 1,5 times the output/bypass phase current. These
recommendations are for guideline purposes only and are superceded by local regulations
and codes of practice.
2.5 Safety Earth
The safety earth cable must be connected to the earth BUS BAR and bonded to each cabinet in the system
and also the earthing and neutral bonding arrangements must be in accordance with the local laws.
ATTENTION!!! Failure to follow adequate earthing procedures can result in electric shock hazard to
personnel, or the risk of fire.
2.6 Cable connection procedure
WARNING!!! All connections of the UPS must be done by qualified service personnel
After positioning the UPS, the cables must be connected as described below:
1. Verify all switches and fuses in front of the UPS are at “0” position. (OFF)
2. Connect the 3 phase AC input coming from the mains distribution panel to the AC input terminals as
shown on the label. (Figure 2.1)
ATTENTION!!!: ENSURE CORRECT PHASE SEQUENCE.
If there is a phase sequence error, UPS doesn’t transfer the load to INVERTER output. If
you can’t see SYNC:OK in the INFORMATION MENU on LCD, then change the input phase sequence.
3. Connect the output of the UPS to the load distribution panel.
4. Connect the battery groups. Refer to battery installation section.