Multi-Unit Parallel Operation; Load Connections On Parallel Systems; Parallel System Bus Connection - Pacific Power Source AFX Series Operation Manual

accessible signals on the system interface bus. It is used for system configuration cabinet
systems only.

5.19 Multi-Unit Parallel Operation

Two or more AFX units can be configured as a parallel system to create a high power
system. This requires at least one Master AFX unit and one or more Auxiliary units or Master
units that will be used as Auxiliaries to the first Master.
Note: Auxiliary units or Master units used in an auxiliary position must be of the same
power output as the Master unit so each unit delivers the same amount of current
/power into the load.

5.19.1 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.

5.19.2 Parallel 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 interface connectors are located on the left hand side of the rear panel and
marked as follows:
PARALLEL IN
PARALLEL OUT
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.
An example of the interconnect between one MASTER and one AUX is shown in the figure
below.
Note: Any unused Parallel bus connector must be covered by the included safety covers.
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Entire Contents Copyright 2018 by Pacific Power Source, Inc. (PPS) • All Rights Reserved • No reproduction without written authorization from PPS.
AFX Series Power Source Operation Manual
On the MASTER unit, this connector is NOT CONNECTED. This causes the
unit to become a master for other parallel units at power on. On an AUX
unit, this connector is connected to a MASTER unit or an AUX unit that
precedes this unit in the parallel chain.
On the MASTER unit, this connector is connected to the first AUX unit. On
the last AUX unit in the parallel chain, this connector is NOT CONNECTED
signifying the end of the parallel chain.
AFX SERIES® OPERATION MANUAL
SECTION 5: UNPACKING AND INSTALLATION
Page 94 of 485