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Technical specifications
Size
104,6mm x 73,9mm x 30mm
Power Supply
The accessory decoder WDMiba requires a suitable external
power supply according to the requirements of connected acces-
sories.
The following values should not be exceeded:
Alternating current:
16V
Continuous current:
22V
Our transformer with 16V AC, 70W output is recommended.
Output current
Pulsed current: 2A each output, max. 4A combined
Continuous current: 1,5A each output, max. 1,5A combined
Connections
2s SX-Bus jacks
2x terminals for power supply
8x 3 terminals for 8 turnouts, light signals, etc.
Switch/Display
Push button and a status LED to switch to programming mode
Plugging to SX-Bus
The module is connected to the SX-data-bus via an (optional) SX-
bus cable.
For large layouts with long cables an additional ground wiring of
the SX-bus is suggested. Use terminal GND for that purpose.
Asynchronous rail and control bus may lead to flickering of the
occupancy detection. Increase response delay and dropout delay
to override this effect.
The module must never be connected to the Selectrix-Power-Bus
(PX-bus)!
Bus cables may only be plugged or unplugged at power down of
the model railway layout.
Assembly notes
The module is assembled following the instructions on the next
page. For soldering the components on the PCB a soldering iron of
12 to 25 Watts or a soldering station with the temperate set to
approx. 400°C is needed together with 0.5 or 1.0 mm soldering
wire with rosin flux. No special tools are required. Do not use
soldering flux! Pay attention to solder speedy to avoid device
damage by overheating.
Non-Use
When the module is not used it should be stored at a dry and clean
place.
The Instruction
The full content of the instruction is important. Very important
information is marked in
col
ou
rs
; critical information is highlighted
in
red
. A recommended value for any setting is marked with an (*).
Installation site
The module should be located in a dry, ventilated and clean
area being easily accessible and lying beside or next to the
model railway layout.
The module must be kept free of coarse dirt or electro conductive
parts falling down.
The module may be arranged without a housing needed. In that
case the module shall be put on an insulating sub floor by means
of the plastic spacer rings and screws delivered.
Keep all electro conductive tools, assembly kits and cables away
from the module during operation.
A negligently and by external circumstances caused short-circuit
(impinging on the module from above or from the bottom) may
destroy the module. If that happens, all terms of warranty will
become invalid.
Update
The heart of the module is a PIC that stores the software. A socket
for the PIC provides easy access for the purpose of any software
update.
Never use other PICs than those dedicated to this module. Disre-
garding may lead to destruction of the module and all term of
warranty will become invalid.
Kit contents
Please first verify that the kit contains all the components listed
below.
General parts:
1x circuit board
1x LED red
1x voltage regulator 78L05
1x rectifier B80C1500 (or similar)
1x push button
1x SX-Bus cable
4x spacer rings
4x screws
Connectors:
2x SX jacks
2x terminals 2-pinned
8x terminals 3-pinned
ICs:
2x 74HC259
1x 28-pinned socket for PIC
1x PIC “WD3”
Transistors:
16x BD677
1x BC547B
1x BC557B
Capacitors (marking):
2x ceramic 100nF (104Z)
2x electrolytic 47µF
1x Electrolytic 1000µF
Resistors (marking):
4x 22kOhm (red, red, black, red, brown)
16x 1,8kOhm (brown, grey, black, brown, brown)
4x 4,7kOhm (yellow, lilac, black, brown, brown)
1x 2,2kOhm (red, red, black, brown, brown)
1x 680Ohm (blue, grey, black, black, brown)
3x 100Ohm (brown, black, black, black, brown)
Extension kit ESMot (2 kits for all 8 outputs, as optional acces-
sory):
16x transistors BD677
16x diodes 1N4001
16x 3,3kOhm (orange, orange, black, brown, brown)
Maintenance and care
Dust clumping together can, in combination with condensating
liquids, become conductive and deteriorate the functionality of the
module. It is therefore important to remove dust regularly by blow-
ing it off or vacuuming the module.
CAUTION: A liquid cleaning of the part is prohibited!
Accessory and expendabilities
The following equipment is available:
Housing:
- Housing for WDMiba: G 523 E
Art. 285
Accessory:
- Recovery diodes
Art. 208
To control uncouplers and turnouts without end position detectors,
additional recovery diodes (SMD) must be installed.
These are soldered on the bottom side of the PCB after all other
components have been populated, according to the drawing on the
next page (bottom side of the PCB).
Expendabilities:
- Extension kit ESMot
Art. 318
Allows the connection of 4 motor-powered turnouts. To enable all 8
outputs for motor-powered turnouts 2 accessory kits ESMot are
required.
Please also visit our FAQ page at www.firma-staerz.de for any
question first.
