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FXP1500-32G AC-DC Front-End
& FXR-3-32G Power Shelf Data Sheet
Synch Start-up Connection Between Shelves
The following connection between the shelves is required to achieve a parallel operation. The synch-start circuits
inside the shelves inhibit all power supplies until the last one has recovered from its overcurrent condition and then
synchronize the restart of the outputs.
Synch Start-up Circuit Description
Description
Pin
Location,
Definition
Type
Signal
Reference
Low level
High level
V max
I max
Auxiliary power +5 V
(Output 2)
26
V O2 +, Aux output, insulated from main output
Logic ground
28
Logic_GND , Internally connected over 10 ? to V O2 -,
(Auxiliary power ground (Output 2))
Internally
connected over
10 ? to V O2 -,
Inhibit_A,
Output inhibit_A
PSU 1-3
12
DC-DC stage ON when pin is open or connected to
LGND
DC-DC stage OFF when pin is connected on high
LGND
<0.8 V
>2.0 V
10 V
3.5 mA
potential
Synch. Startup 1
PSU 1-3
Synch. Startup_A
Rack FXR-3-32G 1-N
Pin on the D-Sub
connector on the
backplane
R5
(at PSU OC)
10
The synch_start pin is connected to the over-current
signal of the PSU1-3. In the case of an overcurrent
shutdown, this signal goes high.
Sync_start_A , Active high The signals of several
racks can be connected together in such a way that
all supplies will be inhibited until the last supply has
recovered from its overcurrent condition.
Vo1-
LGND
<7V off
> 9V
15V
10mA
NOTE: The Sync-Start pins can be wired together only if the power supplies are connected with a minimal voltage drop on power ground as
achieved on a backplane with massive copper bus bars. If there is a less ideal connection, it is recommended to use an opto-coupler for each
unit (IC1, D3, D2).
BCD.00021 Rev.AA, 31-JAN -11
Page 13 of 16
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