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Model Locos: typical wiring with Hand Control and Horn Relay board.

Contents,this page.


Introduction

4QDs' new Reversing Bell throttle hand control and associated Horn Relay board are designed to simplify miniature Loco wiring whilst maximising features available,

The Reversing Bell throttle gives dead man control and may be used without the additional horn relay board.

By cutting one track on the board, 12v horns and lighting may be used with a 24v controller. See instruction manual (PDF format).

A special version of this hand control box is supplied to Phoenix Locomotives Ltd.


Wiring Diagram - standard board, 24v

Wiring for a loco could not be simpler!

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The diagram above shows the wiring for a VTX controller with 24v horns and lighting. The unboxed board is shown but the controller is usually supplied boxed.

Wiring for the earlier NCC series is the same.

Pro-120
The wiring for a Pro-120 controller is identical.

4QD series controller
To use a 4QD series controller, only the Control lead has to be changed to a CLM-834 instead of the CLM-806.

The CLM-834 has one 6 way IDC and one 4 way IDC which plug straight into the sockets on the 4QD series controller.


Alternative wiring

Also available is a wiring diagram for use with 12v lights and horns using the bottom battery of the 24v pair.

A diagram is also available showing a 24v system with a separate 12v battery for lights and horns.

Omega Series Controllers
We supply to Phoenix Locomotives Ltd a complete wiring kit which uses a different version of the HRB-810 and an Omega-S controller. This is only available from Phoenix. Wiring details are available.


Version with fourth relay for reversing lights

HRB-424 includes an additional relay which may be use to operate reversing lights, sounder or other equipment. This relay operates when the appropriatre input goes high, so for a reversing warning it is connected to the black wire from the reversing switch. Wiring is shown separately.

Fuses/Circuit breakers

Shown in the wiring are two circuit breakers or fuses. These are optional but are recommended in case of wiring faults. One is a battery circuit breaker, the other protects your lighting and horn wiring. See our accessories section. The boxed version of the VTX is spplied with a fuse in the battery line.

Battery circuit breaker

A fault in the battery wiring can cause a fire risk. The circuit breaker minimises such risk and also serves as a convenient 'off' switch to completely disconnect the batteries. It can be in battery positive, battery negative or (as shown here) between the batteries. It should be rated not more than about 50-70% of the controller's current rating, so 40-50 amps for a VTX-80, 60-80 amps max for Pro-120 and 70-100 amps max for 4QD-150. In most applications a smaller breaker may be used.

Auxiliary circuit breaker

Similarly, a fault in unprotected horn or lighting wiring can pose a fire risk and a circuit breaker will minimise this. Most applications a 1 amp fuse or breaker will suffice.

Order Codes

You will need to choose 5 items from our products, numbered below. You will have to supply only the horns and lighting and their wiring and (if you wish) the circuit breakers shown in the diagram. Click on the links for more information.

ItemOrder Code
1 (controller)VTX series
Pro series
4QD series
2RBT-810Reversing Bell Throttle, 24v
2aRBT-802Reversing Bell Throttle 12v
3CLM-806Control lead for Pro or VTX
CLM-834Control lead for 4QD series
4HRB-324Horn Relay board, 24v
4aHRB-312Horn Relay board, 12v
4bHRB-424Horn Relay board + 4th relay, 24v
5Motor and battery connection 'tails' for VTX
Motor and battery connection 'tails' for Pro




Page Information


Document URI: www.4qd.co.uk /wire/Horn.html
Page first published: 28th November 2004
Last modified: Wednesday, 14-Mar-2007 10:28:24 GMT
© 2004-2007 4QD
Page's Author: Richard Torrens