HZZ02002G Datasheet, PDF (15/18 Pages) Power-One – FNP1500/1800 Front-Ends FNR-3 Power Shelves Data Sheet

FNP1500/1800 Front-Ends
& FNR-3 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
Auxiliary power +12 V
(Output 2)
Logic ground
Pin
Location,
Definition
26
28
Output inhibit_A
PSU 1-3
12
Synch. Startup 1
PSU 1-3
R5
(at PSU)
Synch. Startup_A
Rack FNR-3-12G &
Rack FNR-3-48G 1-N
10
Pin on the D-Sub
connector on the
backplane
Type
V_o2+, Aux output, insulated from main output
Logic_GND ,Internally connected over 10 Ω to
V_o2-, ( Auxiliary power ground (Output 2))
Inhibit_A ,Active low (DC-DC stage off)
Referenced to Logic_GND
The synch_start pin is connected to the
overcurrent signal of the PSU1-3. In the
case of an overcurrent shutdown, this
signal goes high.
Referenced to V_o1-
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.
Referenced to Logic_GND
Low level
High level
<0.8 V
>2.0 V
<7V off
> 9V
V max
I max
10 V
3.5 mA
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.00247 Rev. AA, 07-Nov-12
Page 15 of 18
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