Technical Specification - Hornby R8249 Manual De Instrucciones

Normal operation
Maximum current carrying capacity of the decoder in sum
Rated continuous current output in sum
Continuous motor output current
Function output current
Address
Speed Steps (Selectable)
Dimensions
CV Name CV
Primary Address 1
Acceleration Rate 3
Deceleration Rate 4
Manufacturer Version No. 7
Manufacturers ID 8
EMF Feedback Cutout 10
Extended Address 17-18
Configuration Data #1 29
Connections
Specifications
NMRA Wire In train
plug in No. colour Decoder
1 Orange J7
2 Yellow J4
3 Green J9
4 Black J2
5 Grey J3
6 White J5
7 Blue J6
8 Red J8
9 Flying Purple J1
Lead

Technical Specification

1 A
500mA
500mA
100mA each
CV 1
CV 17-18
14, 28, 128
17 x 10 x 3.5mm
List of supported CVs
Default Description
Value
3 Bits 0-6 contain an address with a value between 1 and 127. Bit seven must have a value of "0". If the value of
Configuration Variable #1 is "00000000" then the decoder will go out of NMRA digital mode and convert to the
alternate power source as defined by Configuration Variable #12.
5 Determines the decoder's acceleration rate.The formula for the acceleration rate shall be equal to (the contents
of CV#3*.896) /(number of speed steps in use).
5 Determines a decoders braking rate.
13 Manufacturer defined version info
48 Values assigned by NMRA
128 Contains a value between 1 and 128 that indicates the speed step above which the back EMF motor control cuts off.
The Extended Address is the locomotives address when the decoder is set up for extended addressing (indicated
by a value of "1" in bit location 5 of CV#29). CV#17 contains the most significant bits of the two byte address
and must have a value between 11000000 and 11100111, inclusive, in order for this two byte address to be valid.
CV 18 contains the least significant bits of the address and may contain any value.
Decoder Configuration byte 1
Bit 0 = Locomotive Direction: "0" = normal, "1" = reversed.This bit controls the locomotive's forward and backward
direction in digital mode only. Directional sensitive functions, such as headlights (FL and FR), will also be reversed
so that they line up with the locomotive's new forward direction.
Bit 1 = FL location: "0" = bit 4 in Speed and Direction instructions control FL, "1" = bit 4 in function group one
instruction controls FL.
Bit 2 = Power Source Conversion: "0" = NMRA Digital Only, "1" = Power Source Conversion Enabled.
Bit 5 = "0" = one byte addressing, "1" = two byte addressing (also known as extended addressing).
All the CVs shown can be programmed in Operating Mode, Register
CV Mode, Paged CV Mode and Direct CV Mode.
All the CVs shown can be interrogated in all service modes.
The Hornby Decoder supports programming on the Main.
Description
Some advice on the current draw of the decoder output:
The current for all the decoder outputs is supplied by an internal
Motor right
rectifier with a maximum current of 1 Amp and the rated continuous
Rear Light
current is 500mA. The sum of all currents to the motor and the
Function 2
function outputs should not exceed 500mA at normal continuous
Function 3
operation and cannot exceed 1 Amp. If the motor current exceeds
500mA the decoder will automatically cut off power to the motor.
Left Rail
Function outputs are not protected. Each individual output can only
Motor Left
draw up to it's limit.
Front Light
For example if a motor requires as much as 400mA continuously then
Function 1
the function outputs combined should not exceed 100mA.
Common (V+)
Therefore, if the directional headlights require 50mA then the load
Right Rail
Function 1 and Function 2 should not exceed 50mA.
Function 4
For more information visit:
Features
• Control of the motor's rotational speed (load
compensation)
• Acceleration and deceleration separately adjustable
• Selectable for operation with 14, 28, 128 speed steps
• Programming on main track
• Four On/Off function outputs. Two of the function
1-127
outputs are dedicated for the head / tail lights.
1-9999
• Operation on standard DC systems (analogue
operation) possible
• Motor overload current protection
• With NMRA RP-9.1.1 / NEW652 medium plug
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