Chapter 2 Single UPS Installation And Commissioning 17
Liebert
®
ITA 16kVA And 20kVA UPS User Manual
3-in 1-out, common source configuration
Warning
The factory default of the UPS is 3-in 3-out, common source configuration. If you need to change the power distribution mode to
3-in 1-out ,follow the steps described in the next section Changing power distribution mode. Continue the input and output power
cable connection and power-on commissioning after confirming that the change has been successful.
1. Remove the protective cover A of the I/O terminal block.
2. Remove the plates on six cable entry holes of the protective cover B according to the cable direction.
3. Pass all the cables to be connected to the I/O terminal block through the cable entry holes of the protective cover B
according to the actual situation.
4. Confirm that the power distribution mode of the UPS has been changed to 3-in 1-out according to the steps
described in the next section Changing power distribution mode.
5. As shown in Figure 2-18, paste the insulating film (accessory) on the copper shorting bar 10, and insert the buckles
into the corresponding holes on the copper shorting bar 10.
Assembling
Completed status
Insulating film
Copper shorting
Buckle
bar 10
Figure 2-18 Pasting the insulating film to the copper shorting bar 10
6. As shown in Figure 2-19, short connect bA, bB and bC terminals using the copper shorting bar 7, short connect the
two PE terminals of the I/O terminal block of the UPS using the copper shorting bar 10 with insulating film, short
connect oA, oB and oC terminals using the copper shorting bar 5, short connect mA and bA terminals using the
copper shorting bar 6, short connect mN and bN terminals, and two oN terminals using the two copper shorting
bars 4.
10 4
7
54
8
6
UPS
oN oA oB oC PE mNbN bAmA bB bC
ACBNPEPELN
UPS output Main input
mB mC
Figure 2-19 3-in 1-out, common source configuration cable connection
7. Connect the copper shorting bar 8 to one end of the copper shorting bar 7 (see Figure 2-19), and connect the live
line (input phase A) to the copper shorting bar 8.
8. Connect the live lines (input phase B and input phase C), N line and PE line respectively to the I/O terminal block
(mB and mC terminals) of the UPS, the copper shorting bar 4 with mN and bN terminals, and one screw hole of the
copper shorting bar 10.
9. Connect the output L line, N line and PE line respectively to the copper shorting bar 5, the copper shorting bar 4
with two oN terminals, and the other screw hole of the copper shorting bar 10.
10. Install the protective cover B of the I/O terminal block.
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