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DFR PS1
POWER SUPPLY
DFR is the standard 19” (483mm) 4RU chassis. The standard power supply unit for
DFR is PS1. The power supply can only be installed and operated with the DFR. The
power supply for delivering a constant 12VDC output from a wide range (100-240VAC
50-60Hz) of AC input voltages comprises with a transformer in combination with a
load sharing power supply circuit. The primary of the transformer is fused with a 4
amp slow-blow fuse at rear panel of the power supply unit.
A positioning pin is included on each PS1. The location of PS1 can only be installed in
slots 15-17 in the far right of the DFR as shown in the front view diagram above. The
secondary power supply unit PS1 for redundancy is optional. The location of
secondary power supply can only be installed at slot 12-14 in the DFR.
EARTH GROUND
Use 14AWG stranded wire attached to ground lug and earth ground.
Warning
UNDER NO CIRCUMSTANCES SHOULD THE MAINS EARTH BE DISCONNETED FROM THE
PS1 POWER SUPPLY UNIT
BACK PLANE
The back plane of the rack is for the purpose of distributing voltage to the plug-in
modules and communication with NETC and plug-in module. A 10-pin connector is
provided from the back plane for each module slot in the rack, supplying 12VDC and
data exchange by using RS485.
PLUG-IN MODULES
Plug-in modules can be installed into a DFR standard 19” (485mm) chassis with a
built-in power supply unit PS1 in a large system. Plug-in modules are installed by
sliding the module into a pair of top and bottom card guides in any available slot in
the rack. The module should be pushed in completely such that the 10-pin female
connector on the rear of the module engages the 10-pin male connector on the back
plane. The plug-in module is then fastened into place by tightening the captive panel
screw into the appropriate mating hole with a flat blade screwdriver.
Each plug-in module is equipped with a green LED, which will glow when power is
applied to the rack. It is impossible for the failure of any module to disable the entire
rack, since each input voltage line on the plug-in module is individually fused at 1
amp.
