Chapter 7 - 1+1 Parallel System 7200 Series UPS User Manual
Installation procedure (Separete batteries) Single Module and 1+1 Parallel System
document in response to "powersure ups"
Page 7-6
Issue 6
(03/98)
7.2.3 Control cables
Parallel bus
Each module has its Parallel Board ( s. n. 4520075B ) connected with the other via two shielded 34-
poles flat-cables.
The connection is redundant, disconnecting one cable lits a red LED on Parallel boards, disconnecting
both cables inverters are blocked ( this last function may be disabled during servicing of the system ).
Cables length is fit for connection of two modules side by side; cables enter in cabinets passing trough
the slot right in the base of cabinet ( see Fig. 3-2 ).
Emergency Power Off ( EPO )
It’s suggested to use an emergency power off push button with two separate and insulated ways, so it’s
possible to power off both modules at the same time.
A third insulated way may be used to trip input breakers of distribution panel if it’s needed to power off
also inputs of modules.
For EMI reasons cabling must be shielded and shield must be grounded at EPO side.
X2
X3
X2
X3
FC parallel 1
X1
FC ( 60 poles ) to X7 UPS board
X1
FC ( 60 poles ) to X7 UPS board
FC parallel 2
Module 1
Parallel Board
Module 2
Parallel Board
Figure 7-D. Connection of parallel signal bus cables
X3
10
11
Module 2
EPO push button
X3
10
11
Module 1
Figure 7-E . Connection of EPO push button
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