Sprog SBOOST II Bedienungsanleitung

SBOOST II User Guide 1

SBOOST II DCC Booster

User Guide

SBOOST II User Guide 2

Introduction

SBOOST II is a DCC booster designed primarily intended for use with the

SPROG II, but also useable with other DCC systems, to boost the track

output current for driving a larger layout.

Requirements

Regulated DC Power Supply 12 –20V, 3A

Features

Opto-isolated DCC input for electrical isolation between the layout and

the command station

DCC activity LED shows reception of valid DCC input

Power LED flashes when programming track power is live

DCC, Track and power connections by pluggable terminal blocks.

Power out terminals for SPROG II.

Specification/Operating Conditions

Parameter

Minimum

Typical

Maximum

Units

DC Input supply

voltage

12V

20V

Note 1

Vin supply current

2.6

Note 2

Output Load –

Operating Layout

2.5

Auto reverse

detection delay

1.2

Overload detection

delay

3.2

Overload cutout

delay

410

1. If using the Power out terminals, the DC input supply must be

limited in accordance with the equipment connected to the power

out terminals.

2. The current capacity of the power supply must be greater than the

2.5A current limit of the SBOOST II. A suitable power supply is

available from SPROG DCC Ltd or our dealer network.

SBOOST II User Guide 3

3. The DCC track voltage will be slightly less than the power supply

voltage.

SBOOST II User Guide 4

DCC Parameters

Minimum

Typical

Maximum

Units

DCC signal input

voltage

DCC signal input

current

Note 1

DCC signal input

current

16.5

Note 2

DCC Input –Track

Output Delay

1.6

µs

1. Vin 12V

2. Vin 18V

LEDs

Track LED

Off

Track power off

Flashing Moderately Quick

Track power on

Flashing quickly

Short circuit

DCC LED

Flashing slowly

No DCC signal

Flashing Quickly

Valid DCC Signal

Installation

Connection to the SBOOST II is via 4-way pluggable terminal blocks as

shown below.

The following steps are required to install SBOOST II before you can use it

for the first time:

SBOOST II User Guide 5

Connect to the Power Supply

Connect to the Layout

Connect to the Command Station

Connect to the Power Supply

Power supplies sold by SPROG DCC Ltd at the same time as an SBOOST II

are supplied pre-wired to the pluggable terminal block.

If using your own power supply, or the power supply provided by your dealer

is not pre-wired, then it must be connected to the Power In terminals,

observing the correct polarity.

Connect to the Layout

Connect the SBOOST II to the track using the track terminals “Tr A” and “Tr

B” of the pluggable terminal block.

Connect to the Command Station

Connection to a SPROG II (version 2 and earlier)

The pluggable terminal block is arranged to allow a straight forward

connection to a SPROG II for both the DCC signal and to supply power to the

SPROG II (See below), see the picture below.

Connect the SBOOST II DCC inputs “In A” and “In B” to the SPROG II track

outputs.

Powering a SPROG II (all versions)

There are two considerations to be taken into account when powering an

SBOOST II and a SPROG II from the same power supply.

The electrical isolation between the layout and command station (i.e. SPROG

II) will no longer be effective.

SBOOST II User Guide 6

The SPROG II has a lower maximum supply voltage of 15V, compared to the

SBOOST II maximum of 20V. When using an SBOOST II with a supply

voltage greater than 15V special care must be taken. For SBOOST II supply

voltages above 17V, a separate power source, of the correct voltage, must

be used for the SPROG II. For SBOOST II supply voltages in the range 15 –

17V you can use a separate power supply or insert a string of 3 1N4001 (or

similar) diodes in series with the +V connection to drop the voltage slightly.

Connect the SBOOST II +V output to the SPROG II +V input.

Connect the SBOOST II 0V output to the SPROG II 0 input.

If the track output of the SPROG II is also powering a track power district then

the power supply must be rated at least 3.5 Amps. See “Considerations

When Daisy-chaining Boosters”, below.

Connection to a SPROG 3

Follow the connection instructions for SPROG II. The SPROG 3 is rated for

the same maximum voltage as the SBOOST II and can always use the same

power supply.

If electrical isolation is required between the layout and SPROG 3 then a

separate, isolated, power supply must be used.

If the track output of the SPROG 3 is also powering a track power district then

the power supply must be rated at least 5 Amps. See “Considerations When

Daisy-chaining Boosters”, below.

Connection to Other Command Stations

SBOOST II has an opto-isolated DCC input and can be connected to the

DCC output of most DCC command stations and boosters.

Multiple Power Districts Using SBOOST II

If more than one SBOOST II is to be connected between the command

station (e.g. one of the SPROG family) and the layout, to give multiple power

districts, then care must be taken with both the DCC input connections and

the track connections to ensure the same polarity at each SBOOST II.

Connect all of the SBOOST II “In A” terminals together and connect to one

output of the command station.

Connect all of the SBOOST II “In B” terminals together and connect to the

other output of the command station.

Connect the “Tr A” and “Tr B” outputs to the layout in a consistent manner in

SBOOST II User Guide 7

each power district. E.g. connect “Tr A” to the left rail in each power district

and connect “Tr B” to the right rail in each power district.

BOTH rails MUST be gapped between power districts. The SBOOST II track

outputs must only be connected to their own power district, i.e., there must be

NO common wiring between power districts.

If a single power supply is used to power more than one SBOOST II it must

be rated to supply the maximum current to all SBOOST II simultaneously.

E.g. for two SBOOST II the power supply must be rated at greater than 5

Amps.

If separate power supplies are used to power multiple SBOOST II then they

should all be of the same type and voltage rating. The 0V connections of all

the SBOOST II must be connected together. This is sometimes referred to as

a booster “home ground” connection.

Considerations When Daisy-chaining Boosters

If a booster A which powers a track power district A is connected to a booster

B which powers a track district B then a short circuit in power district A will

remove the DCC signal to the input of booster B. This will result in loss of

power in power district B. For satisfactory DCC operation, daisy-chaining of

boosters in this way is not recommended.

SBOOST II User Guide 8

Example 1

SPROG 3 (or SPROG II) driving multiple SBOOST II with common power

supply.

The power supply must be able to supply the full rated current (e.g., at least 5

Amp for 2 x SBOOST II).

Power districts must be separated by isolation gaps in both rails.

The SPROG 3 (or SPROG II) can be powered from one of the SBOOST II

Isolation Gap

Power

To further SBOOST

SBOOST II User Guide 9

Example 2

SPROG 3 (or SPROG II) driving multiple SBOOST II with separate power

supplies.

Each power supply should be the same voltage.

Each power supply must be able to supply the full rated current of the

SBOOST II, i.e., at least 2.5 Amp.

A common ground connection is required between the power supplies.

Power districts must be separated by isolation gaps in both rails.

The SPROG 3 (or SPROG II) can be powered from one of the SBOOST II.

Isolation Gap

Power

To further SBOOST

SBOOST II User Guide 10

Example 3

SPROG 3, SPROG II or other booster and SBOOST II daisy-chained with

common power supply.

Using a SPROG 3 (or SPROG II or other booster) and SBOOST II in this

way is not recommended.

A short circuit in the SPROG 3 power district will affect the DCC signal to the

SBOOST II, resulting in the loss of the DCC signal in the SBOOST II power

district.

The power supply must be able to supply the full rated current (i.e., at least 5

Amp for SPROG 3 plus SBOOST II).

Power districts must be separated by isolation gaps in both rails.

Isolation Gap

Power

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