AFX SERIES® OPERATION MANUAL
SECTION 5: UNPACKING AND INSTALLATION
Entire Contents Copyright
2016 by Pacific Power Source, Inc. (PPS) • All Rights Reserved • No reproduction without written authorization from PPS.
AFX Series Power Source Operation Manual
Page 68 of 274
Note:
Auxiliary units must be same power output as the master unit so each unit delivers
the same amount of current /power into the load.
5.18.1
Load Connections on Parallel Systems
Paralleling two or more units requires that their outputs are tied together using equal length
load cables from each unit to the load. A common coupling terminal block may be used to
combine outputs in combination with larger size load wires to the load. Make sure the
appropriate size wiring is used for the higher current levels obtained by paralleling two or
more units.
5.18.2
System Bus Connection
For both units to operate correctly, the system bus connections between the master and
auxiliary units MUST be made. This is done by daisy chaining the master to the first auxiliary
and that auxiliary to the next one.
The system bus uses a DVI-I Dual Link Male to Male interconnect cable with noise
suppression ferrite beads. Cable length for paralleling units that are stacked in a 19” cabinet
with no more than 1U space between units is 1 foot (0.3 m). Use of longer cables than 1
foot /30 cm is not recommended. If units cannot be installed in a cabinet, a longer DVI cable
up to 3 feet in length may be used as an exception.
5.18.3
Master / Master Paralleling
Two or more masters can be paralleled as well. This allows AFX units to be used separately
or as part of a larger power source system. This operation is the same and when paralleling
using auxiliary units but only the first Master on the system bus will have an active front
panel. All other Masters will display the fact that they are operating in Auxiliary mode with
an inactive front panel.
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