BCD.00617 Rev AB,16-Nov-2015

Page 12 of 15

MELCHER

The Power Partners.

Accessories Data Sheet

Backplanes BPD, BPF for T Series

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 connectors of the T

units in the rack. With the back plane improperly 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 Allo-

cation 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 connec-

tors for the T units. For safety reasons it is essential to connect

at minimum one of these terminals with the protective 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 according 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 neutral

configuration matches with the back plane and T series AC-

DC converter types. Wrong connection at the input may

damage the T series 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

VAC or 120 VAC where connection to neutral is mandatory.

Integration into a 3-phase system in

∆ configuration (120/208

VAC and without connection to neutral) is only possible with LT

type converters together with the special back plane BPF1037.

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 T series 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 applica-

tion and in compliance with the local requirements in the

wiring to each phase and to the neutral terminal may therefore

be necessary to ensure compliance with local requirements. A

second fuse in the wiring to each input terminal is needed if:

• Standard back planes are used in phase to phase

configuration.

• 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.

Additional Information for Installation of Battery

Charger Systems:

Reverse polarity connection of the battery may damage the

battery, the back plane(s) and the battery chargers.

Prior to putting a system into operation, check whether the

position of the cell voltage selector switch of each T Series

converter corresponds to the required battery cell voltage.

For battery maintenance please contact the battery manu-

facturer.

Exchanging a battery should always include the whole battery

bank. New batteries should be of the same type, with the

same cell voltage and temperature coefficient.

For expansion of battery systems contact the battery manufac-

turer.

For battery location and connection please refer to VDE 0510,

part 2.

In battery charger systems, safety standards demand that a

battery can be completely disconnected from the power sys-

tem including the battery system ground. Depending upon the

project specific requirements, disconnecting may either occur

by a manually operated switch with fuses, or automatically by

means of a circuit breaker.

Caution: Care should be taken during system set-up or after

maintenance when connecting a battery to the power bus of a

back plane (BPF types) fitted with fuses. The T Series

converter system with the back planes should be switched to

the mains prior to connecting the battery to the power bus,

since the reverse current from the battery into the uncharged

output capacitors of the T units and the back plane may

damage the fuses.

Make sure that there is sufficient air flow available for convec-

tion cooling. This should be verified by measuring the case

temperature of each T Series converter when the complete

back plane is installed and operated in the end-use

of the T Series converters must not be exceeded.

Ensure that a unit failure (e.g. by an internal short-circuit) does

not result in a hazardous condition. See also Safety of

operator accessible output circuit.

Standards and Approvals

All back planes correspond to class I equipment.

They have been designed in accordance with UL 1950 and

IEC/EN 60950 standards. Safety approvals are not provided.

scheme for BPD1002 is available.

The units have been evaluated for:

• Building in

• Basic insulation between input and earth, based upon

250 V