BCD.00617 Rev AB,16-Nov-2015

Page 2 of 15

MELCHER

The Power Partners.

Accessories Data Sheet

Backplanes BPD, BPF for T Series

Functional Description

The back plane 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 back planes 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 back plane 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 accord-

ing

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

Note: If a power system is operated with 3 T units per back-

plane, connection to the mains in a 3-phase configuration (Y or

D) will provide equal load distribution on the input lines. Fur-

thermore 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.

Model Selection

Table 1: Type survey

AC Input

Output capacitors

Preload

Application

85...255 VAC

(reduced 100 Hz

1 or 3 phase (Y)

BPD1002

x

–

–

Front-end, fitted with diodes

BPD1003

x

90 mF

–

BPF1004x

–

x

Battery charger, fitted with fuses

BPF1007x

50 mF

x

BPF1006x

90 mF

x

19” Rack, 3 U

Rack for systems with up to 3 T units

1

See also: Electromagnetic Compatibility.

2

Please refer to: Dimensioning Example of a Battery Charger System in Single Phase Connection

3

Only for LT units and 120/208 VAC. See fig.: Mains input arrangement.