HP Parallel Uninterruptible Power System - Manual (Page 86)

Maintenance 86
When powering up the UPS, the parallel system identifies the UPS wired after UNIT 1 as UNIT 2, and
so on.
Item Description
1 Standalone/parallel terminal block (removed)
2 For parallel use only
3 Redundant signal cable
4 Standalone/parallel terminal block
5 For parallel use only
6 Standalone/parallel terminal block
7 UPS UNIT 1
8 UPS UNIT 2
9 Parallel UPS Card cable with ferrite
10 CAN OUT port
11 CAN IN port