
Electrical Accessory Products Back Planes
Edition 5/6.2000 11/14
Installation Instruction
The BPD/BPF series back planes are components, in-
tended exclusively for inclusion within other equipment by
an industrial assembly operation or by professional install-
ers. Installation must strictly follow the national safety regu-
lations in compliance with the enclosure, mounting, creep-
age, clearance, casualty, markings and segregation re-
quirements of the end-use application. See also:
Technical
Information: Installation and Application.
Caution: It is the responsibility of the design engineer
and of the installer to define and apply a safety concept
for the whole system which is provided with a Power-
One back plane. The following are under the aspects
which have to be considered:
•Consult the T-series AC-DC converters data sheet prior
to connecting the system to the mains.
•The necessity to provide a cover over the live parts at the
mains input (hazardous voltage) or over the DC-bus bars
(energy hazard), preventing accidental contact during in-
stallation, start-up of a system or maintenance, depends
on the final installation as well as on the applicable safety
requirements.
•Service should be carried out by qualified personnel only.
•Fuses should be replaced with the same types only.
•The earth terminal on the back plane must be connected
to safety ground.
•Back planes in 3-phase (∆) configuration are available on
request. Modifications to the back plane in the field from
"Y"- to "∆"-configuration (and vice versa) are not recom-
mended.
•The maximum nominal input voltage is 230 Vrms +10%.
Higher input voltages may damage the Tseries AC-DC
converters as well as the back plane.
•Empty spaces in a rack should be covered by a dummy
front panel.
Caution: Prior to handling, the back plane must be dis-
connected from mains and from other sources (e.g. bat-
teries). Check for hazardous voltages and hazardous
energy before and after altering any connections. Haz-
ardous energy levels may be present at the output termi-
nals even after the mains input voltage has been discon-
nected from the unit. This is indicated by the red error
LEDs of the Tseries AC-DC converters. It is the respon-
sibility of the installer to prevent an unwanted short-cir-
cuit across the output of the back plane, of the battery
and of each Tseries AC-DC converter. In case of a short
circuit across the output of a T unit, all LEDs will be off,
although the mains may be present.
The back planes are intended for stationary applications.
They shall be installed in 19’’ racks according to DIN 41494.
Install the back planes vertically, the mains input connector
X1 being on the right hand side of the back plane (view from
the back) and make sure that there is sufficient air flow
available for convection cooling of the T-series AC-DC con-
verters.
Mechanical fixing shall be made via 10 screws M2.5 × 10
and 10 nuts M2.5. When mounting a back plane to a rack,
fit two T units into the H 15 female connectors on the back
plane prior to fixing the back plane to the rack. This ensures
correct positioning of the female connectors on the back
plane with respect to the given position of the male connec-
tors of the T units in the rack. With the back plane improp-
erly positioned, the connectors of the T units and the female
connectors on the back plane may be damaged. In order to
maintain correct positioning, use all the available mounting
holes.
Connection to the supply system shall be made via the 6-
pole screw terminal connector X1 according to:
Connector
Pin Allocation
and
Mechanical Data.
The connector X1 of the back planes (class I equipment) is
provided with two protective earth terminals ( ), which are
reliably connected with the protective earth pins of the con-
nectors for the T units. For safety reasons it is essential to
connect at minimum one of these terminals with the protec-
tive earth of the supply system. Since the earth leakage
current exceeds 3.5 mA, the system must be permanently
connected or it must be pluggable equipment type B ac-
cording to IEC/EN 60950. The earth connection must be
performed before connecting the supply.
To maintain good electrical connection, the AC input, earth
and signal to the terminal strip wiring should be secured,
using tie wraps, to prevent stress upon the wires and the
connectors.
Refer to
Mains Input Section
to ensure that phase and neu-
tral configuration matches with the back plane and Tseries
AC-DC converter types. Wrong connection at the input may
damage the Tseries AC-DC converters as well as the back
plane. Standard back planes are designed for a 3-phase
system in Y connection with a phase to neutral voltage of
230 V or 120 V where connection to neutral is mandatory.
Integration into a 3-phase system in ∆ configuration (120/
208 V and without connection to neutral) is only possible
with LT AC-DC converters together with the special back
plane BPF 1037.
For safety reasons, a mains switch for line interruption is
required.
The back plane does not provide any input fuses. The input
fuses of the Tseries AC-DC converters in the connection
from the L terminal are designed to protect the units in case
of overcurrent and may not be able to satisfy all customer
requirements. An external input fuse suitable for the appli-
cation and in compliance with the local requirements in the
wiring to each phase and to the neutral terminal may there-
fore be necessary to ensure compliance with local require-
ments. A second fuse in the wiring to each input terminal is
needed if:
•Standard back planes are used in phase to phase con-
figuration
•Local requirements demand an individual fuse in each
source line
•Neutral to earth impedance is high or undefined
•Phase and neutral of the mains are not defined or cannot
be assigned to the corresponding terminals (L to phase
and N to neutral).
Important: Do not open the modules, or guarantee will
be invalidated.