18 Chapter 2 Single UPS Installation And Commissioning
Liebert
®
ITA 16kVA And 20kVA UPS User Manual
3-in 1-out, split-bypass configuration
Warning
The factory default of this product is 3-in 3-out, common source configuration. If you need to change the power distribution mode
of the main UPS to 3-in 1-out according to 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 main UPS has been changed to 3-in 1-out according to the steps
described in the next section Changing power distribution mode.
6. 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.
7. As shown in Figure 2-20, 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 bA, bB and bC terminals using the copper shorting bar 7, short
connect oA, oB and oC terminals using the copper shorting bar 5, short connect mN and bN terminals, and two oN
terminals using the two copper shorting bar 4.
10 4
7
54
8
UPS
oN oA oB oC PE mNbN bA bB bC
ACBNPEPELN
UPS oputput Main input
Bypass input
mA mB mC
Figure 2-20 3-in 1-out, split-bypass configuration cable connection
8. Connect the live lines (main input phase A, main input phase B and main input phase C), N line and PE line
respectively to the I/O terminal block (mA, 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 copper shorting bar 8 to one end of the copper shorting bar 7 (see Figure 2-20), and connect the live
line (bypass input phase A) to the copper shorting bar 8.
10. Connect the bypass input N line to the copper shorting bar 4 with mN and bN terminals of the UPS I/O terminal
block.
11. 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 of the UPS UPS I/O terminal block.
12. Install the protective cover B of the I/O terminal block.
Warning
Before the commissioning engineer’s arrival, if the load is not ready for accepting the power, please take good care of the safety
insulation at the end of the output cable.
After the output cable connection, find the label shown in Figure 2-21 on the top cover of the UPS and click ‘√’ after
‘AC OUTPUT’ and ‘BYPASS INPUT’ according to the actual situation for easy maintenance.
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