Sutton's Locomotive Workshop British Railways Sulzer Type 2 Operating Manual - page 16
As well as the previously described twin loudspeaker connections, the main PCB
incorporates three other features new to British market. The first of these is the
provision of two energy storage capacitors wired in parallel. Giving a total value of
1360μf, they are linked to the ZIMO decoder’s dedicated circuitry connections
providing full ‘stay-alive’ and ‘smart-stop’ capability. See the Chapter on DCC Sound
for a more detailed explanation of these special features.
A further three-pin connector also provides for a direct link to the decoder’s
Switch Input, Common and Ground, allowing an input device, such as reed switch
to be attached. The most obvious use of this is to attach a Hall Sensor allowing
automatic magnetic triggering of a sound function, and in fact, a warning horn has
been set as the sound default in our programming for just this occasion. (See Chapter
11 for further details and add-on kit). Wire routing holes have been provided in the
chassis, below the motor, for those who wish to undertake this advanced modification.
Additionally, four solder pads are provided for DCC specialists who wish to
make a direct connection to the decoder’s serial user standard interface (SUSI) for
control of further devices such as servos.
For reference, the Function Outputs are wired to the following lighting circuits on
DCC equipped models:
Output
Lighting circuit PluX22e pin
FOf
No. 1 end: Marker lights (white)
7
FO1
No. 1 end: Tail lights (red)
16
FO3
No. 1 end: Headcode box
2
FO5
No. 1 end: Headlights
20
FO7
No. 1 end: Cab interior/engine room
22
FOr
No. 2 end: Marker lights (white)
13
FO2
No. 2 end: Tail lights (red)
18
FO4
No. 2 end: Headcode box
19
FO6
No. 2 end: Headlights
21
FO8
No. 2 end: Cab interior/engine room
11
Note: Not all function outputs/lighting circuits may be used on every model version.
For instance, a pilot scheme Class 24 will obviously not have alpha-numeric headcode
box or twin headlight illumination circuits fitted. Redundant outputs may, of course, be
reprogrammed and utilised for other features such as electromagnetic couplings, smoke
generators, etc. if so wished (and if space can be found).
9. Wheels and bogies
In another first for a British model, and in response to the demands of those using
employing more accurate track gauges, we have supplied factory-fitted ‘finescale’
wheelsets in one of three different gauges. The wheels incorporating the distinctive stress-
relieving holes around their circumference. In best practice, turned wheels are mounted
on steel axles with insulating collars that also act to limit lateral movement. Different size
collars and axle lengths are used dependant on the gauge. Brass bearings lock into the
machined cast metal gearbox to minimise wear and maintain tight tolerances.
In an effort to keep the wheels looking as accurate as possible within the compromises
dictated by ‘OO’ (16.5mm) and ‘EM’ (18.2mm) gauge, the widely-used NMRA
RP-25/110 wheel contour standard has been adopted, avoiding unnecessary deep flanges.
These wheelsets have been extensively tested on numerous commercially available
Code 75, 83 & 100 track systems.
For exact-scale ‘P4’ (18.83mm gauge), a much finer wheel profile is adopted that
complies with published standards from groups working in this gauge.
The brake rigging and blocks align with ‘P4’ wheelsets by default. Optional ‘OO’
versions of the brake blocks are provided separately and can be fitted, if required, to give
a better look when using 16.5mm gauge wheelsets. This will require disassembly of the
bogie and is only recommended for the experienced.
Back-to-back dimensions are set at 14.50mm (‘OO’), 16.50mm (‘EM’) & 17.75mm
(‘P4’) at our factory but should be checked before and regularly during use, and
adjusted if necessary to obtain optimum running characteristics. Some experienced
users will wish to make small changes to these measurement to suit their own
trackwork requirements.
Should you wish to change to a different gauge after purchase, this is possible by
removing the keeper-plate on the underside of each bogie’s gearbox and simply
replacing each wheelset. The plastic keeper-plate is held in place by a large clip at each
end and two smaller clips each side inboard of the axles. Gently lever them over their
retaining lugs. The wheelsets can be extracted and replaced by hand. Make sure the
gear wheels are in alignment and that the bushed brass bearings are firmly seated down
in the axle recesses. Wipe pick-ups can be adjusted to apply light pressure to the rear
faces of the wheels. Replacement wheelsets to suit all three track gauges are available
from us for an additional charge.
SLW Class 24 Operating Manual
Page 31
Page 30
SLW Class 24 Operating Manual