4-14
4-6-5 Wiring (Parallel Redundancy, Dual Input)
1. Confirm if the input and bypass input breaker (Q1 and Q2) are cut off (Refer to Fig.
4-2).
2. Confirm if the manual bypass circuit breaker (Q3) is cut off.
3. Confirm if the output breaker (Q4) is cut off.
4. According to UPS model you have selected, make use of a suitable cable and lug
(Refer to
Table 4-3).
5. Connect all cables to the right terminal or location as indicated (Refer to Fig. 4-1).
6. Connect the parallel communication cable between UPS1 and UPS2 (Refer Fig. 4-
5).
1. For installation of parallel system, the total cable length of input must be equal
to one of output. This regulation prevents unbalanced load shared by two UPSs
under reserve mode.
i.e.: Res1 + OP1 = Res2 + OP2 = (Deviation must be less than 10%)
2. Two UPSs must have the same rating/capacity (80 or 120kVA) for parallel
installation. Different ratings cannot link together.
O/P
Main I/P
Reserve I/P
Parallel Port
UPS1
O/P
Main I/P
Reserve I/P
Parallel Port
UPS2
Load
AC I/P 1
Res1
Res2
IP1
IP2
AC I/P 2
Parallel C
ab
le
OP1
OP2
Fig. 4-5 Wiring (Parallel Redundancy, Dual Input)
