Accessories
Backplanes
Backplanes for the T Series
19"/3U Rack-Systems
BPD Series
BPF Series
•
Easy configuration of telecom rectifiers, battery
chargers and power bus systems
•
Provides controller function
• 1.6 kW maximum power
•
Single or triple phase connection
•
Redundant configuration possible
Summary
The backplane types BPF 1000 and BPD 1000 have been
designed for fast and simple set-up of 19" rack-mounted
power supply systems powered by AC-DC converters of
the T series. Battery charger systems, telecom rectifiers,
and modular power bus systems can easily be configured
with n+1 redundancy if required. Three T units can be
plugged into one backplane providing up to 1.6 kW output
power.
Since for such applications the status of the power bus is of
importance rather than the output status of a single AC-DC
converter, T units with option D should be choosen enabling
remote bus voltage sensing.
The backplane concept allows quick system assembly.
When fitted in the rack all input and output terminals are
readily accessible from the rear. The AC input is designed
for single or 3-phase operation. The monitoring signals
and the control signal inputs and outputs are available
from a screw terminal strip. System specific signal
combination is possible with different jumper settings. The
backplane fulfills in this way the function of a controller
unit.
The layout of the backplane and the hot plug-in capability
of the AC-DC converters allow system expansion under
load (e.g. from 550 W up to 1.6 kW) by simply inserting
further T units into the rack. Larger system power extension
is just a matter of interlinking the DC output rails and signal
outputs of two or more racks.
The backplanes are available in 2 basic versions:
– BPD 1000
A front-end version, fitted with decoupling diodes in each
positive line to the DC bus, for systems with 2 or more
T units in parallel or n+1 redundancy.
– BPF 1000
A battery charger version, in which each output is fitted
with a fuse in the positive line to the DC bus, for battery
charging or rectifier systems with two or more T units in
parallel or n+1 redundancy.
For minimum electromagnetic emission at the input, both
the BPD and the BPF versions are fitted with input filters.
Should project specific requirements demand enhanced
hold-up time or lower output ripple (low frequency ripple)
than specified for the individual AC-DC converters, both
basic backplane versions are available with additional
output capacitors.
Important:
The neccessity to provide a cover over the
live parts at the mains input (High Voltage) or over the
DC bus bars (Energy Danger), preventing accidental
contact during installation, start-up of a system, or
maintenance depends on the final installation as well
as on the applicable safety requirements. However, it is
the responsibility of the installer or user to provide such
a safety cover to assure the compliance with the
relevant and applicable safety standards.
Table of Contents
Page
Page
Electromagnetic Compatibility (EMC) .............................. 7
System Integration ........................................................... 8
Mechanical Data ............................................................ 10
Safety and Installation Instructions ................................ 10
Summary .......................................................................... 1
Type Survey and Key Data .............................................. 2
Functional Description ..................................................... 2
Mains Input Section ......................................................... 4
Output Section ................................................................. 5
REV. JUL 05, 2005
Page 1 of 15
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Accessories
Backplanes
Type Survey and Key Data
Table 1: Type survey
AC Input
85...255 V AC
1 or 3 phase (Y)
BPD 1002
BPD 1003
BPF 1004
BPF 1007
BPF 1006
19” Rack, 3 U
1
2
3
Input filters
1
Output capacitors
(reduced 100 Hz
output ripple)
2
–
90 mF
–
50 mF
90 mF
Preload
Application
x
x
x
x
x
–
–
x
x
x
Front-end, fitted with diodes
Battery charger, fitted with fuses
Rack for systems with up to 3 T units
See also:
Electromagnetic Compatibility.
Please refer to:
Dimensioning Example of a Battery Charger System in Single Phase Connection
Only for LT units and 120/208 V mains. See fig.:
Mains input arrangement.
Model numbers highlighted in yellow or shaded are not recommended for new designs.
Functional Description
The backplane is divided into 3 sections, each one fitted
with an H15 female connector for one T unit, with the mains
input section and the DC output section separated from
each other.
The layout of the standard backplanes gives the user the
flexibility to operate the system either in single phase or
in 3-phase (Y) configuration. Connection to the mains is
achieved via the 6-pole connector (X1). With the wire
jumpers B10/20/30 in Y-position (standard configuration)
each T unit is connected between its defined input line and
the neutral. (Changing of the configuration by the customer
is not recommended.) An input filter, provided in the supply
line to each T unit minimizes the conducted noise at the
input of the system. The positive output of each T unit is
separately fed to the common power bus and is decoupled
depending upon the backplane type, either by a fuse
(F11/21/31) or by a decoupling diode (D11/21/31). The
fuses (cartridge type) are externally accessible from the
frontside. The BPF versions are fitted with a common
preload (R25). Additional output capacitors (up to 3 per
output,10 mF each) further reduce the low frequency
output ripple and provide enhanced hold-up time.
All relevant monitoring signals as well as control signal
inputs and outputs are accessible at the signal terminal
strip (X5). The jumper strip (X3) allows system specific
signals according to different jumper settings. An
auxilliary circuit (protected by a fuse F1, rated T1A, 250 V,
5
−
20 mm) allows a relay to be directly driven for system
specific control functions.
Each T unit provides an individually adjustable power
down signal enabling bus status monitoring at different
voltage levels. The threshold values can be set at the
soldering tabs
D
set
(R13/14, R23/24 and R33/34).
Note: If a power system is operated with 3 T units per
backplane, connection to the mains in a 3-phase
configuration (Y or
∆)
will provide equal load distribution
on the input lines. Furthermore the low frequency ripple at
the output of the T units is compensated to zero as long as
all 3 T units are in operation.
REV. JUL 05, 2005
Page 2 of 15
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Accessories
Backplanes
Signal terminal strip X5
Fuse F1(auxiliary circuit)
Connector H15 for T unit
X4
3
Input filter
Y
B30
+
D31
D21
D11
2
Input filter
Y
B20
Y
B10
1
Input filter
Mains input connector X1
L1
L2
L3
N
03012_063005
F31
–
R33
R34
R23
R24
F21
R25
R13
R14
F11
Jumper strip X3
Bus bar system
Output capacitor (10 mF, each)
Preload (<10 W)
D
set
T1
Output fuse Decoupling
diode
Fig. 1
Backplane, view from the rear
T unit 1
B10
F
Y
P
N
Vo+
Vo–
Vo+ (BUS)
F11
R14
R13
D1
Sys In 1
Vo+ (BUS)
F21
R24
R23
D2
Sys In 2
Vo+ (BUS)
F31
R34
R33
D3
Sys In 3
C
+
+
C C
+
C
+
+
C C
+
C
+
+
C C
+
D11
03013
X1
L1
L2
L3
N
Y
B20
F
D set
D
i
Sys out
Sys In
RPT
DC-Bus
D21
R25
RPT
Vo–
D31
Vo+
T unit 2
P
N
Vo+
Vo–
D set
D
i
Sys out
Sys In
+
+
–
–
B30
F
Y
T unit 3
P
N
Vo+
Vo–
D set
D
i
Sys out
Sys In
RPT
Fig. 2
Block diagram of backplane
F11, 21, 31 fitted to BPF types. D11, 21, 31 fitted to BPD types.
REV. JUL 05, 2005
Page 3 of 15
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Accessories
Backplanes
Mains Input Section
Connection to the Mains
Connection to the mains shall be made via the 6-pole
screw terminal connector (X1), located on the right-hand
side of the backplane (view from the rear).
For single-phase operation the terminals (L1, L2, and L3)
at the female connector X1 should be connected together.
The T-series has two AC input voltage ranges. The LT units
are optimized for the 230 V mains, the UT units for the
120 V mains. (See also:
T series)
Phase - phase (∆)
∆
L1, L2,
Not allowed
LT types only
External fuses required
3-phase (∆)
∆
L1, L2, L3,
Not allowed
With special backplane
BPF 1037 and
LT types only
Table 2: Mains input arrangement
Mains voltage
Phase-Earth/Phase-Phase
230/400 V
120/208 V
Single phase
L, N,
LT types
3-phase (Y)
L1, L2, L3, N,
LT types
LT types
UT types
Single-phase/3-phase (Y) Configuration
Standard backplane version (Y-configuration)
The layout of the standard backplanes allows operation of
the system either in single phase or in 3-phase (Y)
configuration. In both configurations each T unit on the
backplane is connected between its defined phase and
neutral. For single phase operation the AC-input terminals
(L1, L2 and L3) should be connected together at the
female connector. Connections to neutral and to ground
are mandatory. (See also fig.:
Single phase configuration
as well as fig.:
3-phase (Y) configuration.)
Equal load
distribution on the input lines at 3-phase configuration will
compensate the low frequency ripple at the output to zero.
Phase to Phase Configuration
With standard backplane version (Y-configuration)
For LT units exclusively
The layout of the standard backplanes also allows phase-
to-phase connection at low mains voltage 208 V e.g. USA,
providing full output power from the LT units. In such cases
one of the two input lines (L1 or L2) should be connected to
the N-terminal at the AC input connector instead of the
neutral line. The neutral line is not connected. For safety
reasons an external fuse should be fitted in each input line.
Connection to the ground is mandatory.
03019
I
i
Input Filter
03017
29
14
I
o
Vo+
Vi+
26
17
Option P
Input Filter
Gi+
Go+
V
i
i (option)
Control circuit
R (option)
C
e
Control circuit
2
V
o
R
–V
i
C
e
–V
o
20
8
Gi–
23
32
11
Go–
Vi–
Vo–
I
i
I
o
Fig. 3
Single phase configuration L, N
230 V mains: LT-types
Fig. 5
Phase to phase configuration L1, L2
120/208 V mains (e.g. USA): LT types only.
Not applicable for UT types.
03018
I
i
Vi+
Fuse
1
Vo+
I
o
Input Filter
Option L
D (option)
i
Control circuit
Option C
R
G
V
i
V
o
Gi–
V
t
Option D
1
V
o
Option P
Go–
Fuse fitted for option
Fig. 4
3-phase (Y) configuration L1, L2, L3, N
230/400V mains: LT-types
120/208V mains: UT-types, LT-types
1
1
Reduced output power with LT types
REV. JUL 05, 2005
Page 4 of 15
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Accessories
Backplanes
3-phase (∆) Configuration
∆
With special backplane version BPF 1037
(∆ configuration) for LT units exclusively
Low mains 120/208 V
The input section of the 3 LT units is wired in a
∆-connection
enabling full output power of the LT units at
low mains input voltage 120/208 V.
Backplanes in 3-phase (∆) configuration are available on
request. Modifications to the backplane in the field from "Y"
to "∆"-configuration (and vice versa) are not
recommended. Maximum nominal input voltage: 230 V
rms
+ 10%, phase-to-phase. Higher input voltages may
damage the LTs as well as the backplane. Connection to
the mains should strictly be done according to fig.:
3-phase
(
∆
) configuration.
Wrong connection at the input may
damage the LT units as well as the backplane. An external
fuse needs to be installed into each input line.
∆
∆
∆
L1
L2
L3
N
LT
1
LT
2
LT
3
X1
04020
L1
L2
L3
Fig. 6
3-phase (
∆
) configuration, L1, L2, L3
120/208 V mains (e.g. USA) LT types only.
Not applicable for UT types.
Output Section
Power Bus
The backplane is fitted with a generously dimensioned
bus bar system. Each bus bar (4 mm thick Alu alloy profile,
identified with its polarity) is fitted with 2 captive nuts (M 6)
serving as connection points to the load as well as to the
battery system. Depending upon the application either the
positive or the negative pole of the battery may be earthed.
For application specific requirements such as reduced
ripple current, reduced low frequency ripple voltage,
enhan-ced hold-up time or heavy pulse loads, the
backplanes are available with additional output capacitors
(see table:
Type Survey).
The output capacitors are
mounted between the positive and the negative bus rails.
Front-end Version
To provide maximum system reliability especially with n+1
redundant systems, each positive output path is fitted with
a decoupling diode mounted onto the positive bus rail. The
diodes D11, D21 and D31 prevent a possible Power Down
on the power bus in the case of a short-circuit across the
output of one of the T units. To maintain the signalling
functions of the T unit(s) in the case of a single inhibit or a
single mains phase failure, a PTC in parallel to the
decoupling diode allows a small reverse current from the
DC bus supplying the control functions of the affected
T unit.
Battery Charger Version
Direct battery charging or powering battery buffered
systems require an adequate float charge voltage over the
specified temperature range. Decoupling diodes should
be avoided due to their voltage drop, affecting the float
charge voltage of the battery. To maintain system
redundancy adequatedly rated fuses (F11, F21 and F31,
rated F20A minimum, 250 V, 6.3
−
32 mm each) are
mounted in each positive output line. In the case of a short
circuit across the output of one of the T units the relevant
fuse will blow, interrupting the reverse short circuit current
supplied by the battery and the remaining T units.
REV. JUL 05, 2005
Power Down Signal
(D1, D2, D3)
The power down signal monitors the voltage level of the
bus bar system. Depending upon the application it may be
advantageous to use the power down signal D1 and D2 in
a redundant configuration and the third signal (D3) as a
separate warning signal at a higher threshold level. For
such a configuration the jumpers of X3 should be set in the
positions
ℜD
- D1 and
ℜD
- D2. (See fig.:
Jumper strip (X3),
Signal meshing.)
For individual adjustment of the power down level see
also:
System Integration.
Inhibit
The output of a T unit may be enabled or disabled by the
inhibit input signal. Moreover the output voltage can be
controlled with an external temperature sensor connected
to this input. If just the inhibit function is used, the units can
be individually inhibited. If the output voltage is
temperature controlled the same sensor signal should
control all units in the rack and the jumpers of X3 should be
set in all 3 inhibit positions,
ℜi
– i1,
ℜi
– i2 and
ℜi
– i3 (See
fig.:
Jumper strip (X3), Signal meshing).
System Good Signal
(Sys In 1, 2, 3/Sys Out 1, 2, 3)
The System Good signal can be used either for status
monitoring of each individual T unit or as a combined
signal for status monitoring of the whole system. For
overall system status monitoring jumpers should be set in
the positions Si1-So2, Si2-So3 (See fig.
Jumper strip (X3),
Signal meshing).
The System Good input of the first T unit in a system (T3)
should be referenced to the negative output. This can be
done either on the jumper strip X3 with a jumper in position
⊥-Si3
(See fig.:
Jumper strip (X3), Signal meshing.)
or
directly at the terminal strip X5, by connecting Sys In 3 to
Vo–. (See also:
System Integration.)
Page 5 of 15
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