Magnum 20
-
SRS Features
•
Connections:
On the rear of the Magnum SRS there is a pair of connectors labelled ‘TO TRACK’ which you use to con-
nect the Magnum 20
-
SRS to your track. If your train is on the track facing forward, and you connect the
red terminal to the right rail, and the black terminal to the left rail, the train will go forward when the
forward/reverse switch is in the forward position. If the engine moves backwards, swap the track wires.
The best way to connect the Magnum 20
-
SRS to the track is with the included banana plug. You can
attach your wire to the banana plug, and then just plug it into the back of the unit.
In addition to the TRACK connection, there is a connection which provides full voltage (24
-
32VDC) output
which can be used to power accessories such as lighting or switch motors. You can connect to these
terminals with a banana plug (additional plugs are available from Bridgewerks or from a local audio
shop), or by unscrewing the connection a little, and then tightening down on the bare wire.
The yellow connectors are for use by the RC
-
100 remote control (not included.)
•
Speed Governor:
Bridgewerks’ exclusive “speed
-
stop” can be used as a safety device to limit the maximum speed of your
trains. The speed stop consists of a metal plate which is held in place with a thumb screw. To adjust the
speed stop, loosen the thumb screw, adjust the throttle slide control so that the train is going as fast as
you want to allow, and then slide the speed stop down to limit the maximum speed. Tighten the thumb
screw. Now you can move the throttle control from 0 up to the maximum selected speed.
•
Momentum:
The momentum switch on the front panel will limit the acceleration and deceleration of the trains. When
momentum is enabled and you move the throttle from the minimum to the maximum, the train will
slowly accelerate from a stop to the maximum speed. Similarly if the throttle is moved quickly from
maximum to 0, the train will slowly decelerate to a stop. Momentum adds another dimension of realism
to your model railroad. In addition, the combination of speed governor and momentum makes it easier
to limit derailments when younger engineers are at the controls.
•
Direction Control:
The Magnum 20SRS has a direction control switch which will change the direction of the locomotive. If
the locomotive runs backwards when the switch is in the forward position, reverse the connections going
to the track.
•
Overload Protection:
In the event of an overload, the Magnum 20SRS has two different ways of protecting itself from damage:
A manual circuit breaker on the left side of the rear panel. The button will pop out and the power to the
track will be cut off. If this happens, correct whatever caused the overload, wait 2 or 3 minutes and then
push the switch to reset it.
In addition, there is an automatic thermal cutoff inside the controller, which will be activated in the event
of an overload. This will reset itself automatically in 2
-
3 minutes after the cause of the overload is re-
moved.
•
Optional Remote Throttle Capability (RC
-
100):
On the back of the 20
-
SRS, there is a pair of yellow terminals for the remote control—plug the receiver
into these two yellow terminals (it will automatically also plug into the accessory power pins), and pro-
vide you with wireless remote control over the throttle
•
Speedometer:
The 20SRS has the ability to show the scale speed of the locomotive once it has
been properly calibrated. To calibrate:
1.
measure out a scale distance on your layout according to ‘table A’
2.
Turn the ‘MPH’ knob to 5 and the “O” adjust knob to “A”
3.
With your train on the track, slowly increase the speed (using the slide throttle)
until the train begins to move, then turn the “0” adjust knob until the speedometer
just starts to move.
4.
Increase the throttle so that the train is moving at a medium speed. Time the
amount of time that it takes for the train to move through the distance that you
measured out in step 1. Using table B, determine the speed of your train in Scale
MPH.
5.
Continue running at medium speed. Using the scale MPH speed that you calculated
in step 4, adjust the MPH knob to show that speed. For example, if your train took
12 seconds to cover the pre
-
measured distance, then it is going 30MPH. So you
adjust the MPH knob to get the speedometer to read 30MPH.
•
Wire:
Use heavy gauge wire to connect the 20
-
SRS to the track. For distances of up to 15 feet, you should
use 12 gauge wire. For distances over 15 ft, you use 10 gauge wire. Although the track itself is
similar to a very heavy gauge wire, in larger layouts, significant loss can occur from the connections
between sections of track. To improve this, run multiple power connections to the track from the
controller and/or use track clamps rather than slider type couplers. In outdoor layouts which are
exposed to extreme temperatures, the track will expand and contract as the temperature changes,
and slider type couplers may have to be used.
•
Outdoor operation
Garden railways are often installed outdoors and Bridgewerks controllers are built to be used with
outdoor railroad layouts. However, they are not waterproof, and as with any electronic equipment,
they should not be left outdoors when not in use.
To make this easy, the connections are all made so
that they can simply be unplugged and the controller can be carried indoors.
MPH
Sec
10
36
15
24
20
18
25
14.5
30
12
35
10
40
9
45
8
50
7
55
6.5
60
6
65
5.5
70
5
75
4.8
80
4.5
85
4.2
90
4
95
3.8
100
3.6
105
3.4
110
3.3
115
3.1
120
3
Table B
Scale
F
1:20.3
G
1:22.5
G
1:24
#1
1:32
O
1:48
S
1:64
HO
1:87.1
Distance
26 ft
23.5 ft
22 ft
16.5 ft
11 ft
8ft, 3ins
6 ft
Table A
