Control Cables - Liebert 7200 Series User Manual

Chapter 7 - 1+1 Parallel System
Installation procedure (Separete batteries)
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 ).
X1
FC ( 60 poles ) to X7 UPS board
Module 1
Parallel Board
X2
X3
FC parallel 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.
EPO push button
Page 7-6
Issue 6
(03/98)
document in response to "powersure ups"
FC parallel 1
Figure 7-D. Connection of parallel signal bus cables
Figure 7-E . Connection of EPO push button
X1
FC ( 60 poles ) to X7 UPS board
Module 2
Parallel Board
X2
X3
X3
10
11
Module 2
7200 Series UPS User Manual
Single Module and 1+1 Parallel System
X3
10
11
Module 1