BRIDGEWERKS Magnum 20-SRS User manual

WARRANTY
Bridgewerks provides technical support free of charge, regardless of how long you have had your controller.
Somemes an issue can be xed over the phone, saving the cost of shipping and geng your railroad
running faster.
Parts and labor are warranted for a period of 5 years. If your Bridgewerks Product requires repair, ship it
back to Bridgewerks, We will repair or replace it and return it to you. If your warranty has expired, or is
not registered, there will be a charge for repair and shipping.
If a unit is returned for repair and no problem is found, there will be a $25 service charge.
Return Freight Policy: Customer is responsible for return freight; you will be advised the amount when
your unit is ready for return.
Warranty does not cover repairs to damage caused by misuse or abuse. Please do not leave this product
outdoors: unplug the quick disconnect plugs and bring it indoors when it is not in use.
Be sure to keep the packaging just in case your unit ever does need to be returned for service. Some of our
products are very heavy, and the special packaging is designed specically to protect the internal parts and
cosmecs of the product.
Please take a moment to ll out the Warranty card in the box or online at Bridgewerks.com and return it to
us.
Thank you.
BRIDGEWERKS
901 N Brutscher St Suite D383
Newberg, OR 97132
www.bridgewerks.com
Magnum 20-SRS
20 Amp Controller
With Speedometer
User Manual
Family owned and operated since 1995

Magnum 20-SRS Features
• Connecons:
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 le rail, the train will go forward when the
forward/reverse switch is in the forward posion. 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
aach your wire to the banana plug, and then just plug it into the back of the unit.
In addion to the TRACK connecon, there is a connecon which provides full voltage (24-32VDC) output
which can be used to power accessories such as lighng or switch motors. You can connect to these
terminals with a banana plug (addional plugs are available from Bridgewerks or from a local audio
shop), or by unscrewing the connecon a lile, and then ghtening 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 throle 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 throle control from 0 up to the maximum selected speed.
• Momentum:
The momentum switch on the front panel will limit the acceleraon and deceleraon of the trains. When
momentum is enabled and you move the throle from the minimum to the maximum, the train will
slowly accelerate from a stop to the maximum speed. Similarly if the throle 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 addion, the combinaon of speed governor and momentum makes it easier
to limit derailments when younger engineers are at the controls.
• Direcon Control:
The Magnum 20SRS has a direcon control switch which will change the direcon of the locomove. If
the locomove runs backwards when the switch is in the forward posion, reverse the connecons going
to the track.
• Overload Protecon:
In the event of an overload, the Magnum 20SRS has two dierent ways of protecng itself from damage:
A manual circuit breaker on the le side of the rear panel. The buon will pop out and the power to the
track will be cut o. If this happens, correct whatever caused the overload, wait 2 or 3 minutes and then
push the switch to reset it.
In addion, there is an automac thermal cuto inside the controller, which will be acvated in the event
of an overload. This will reset itself automacally in 2-3 minutes aer the cause of the overload is re-
moved.
• Oponal Remote Throle 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 automacally also plug into the accessory power pins), and pro-
vide you with wireless remote control over the throle
• Speedometer:
The 20SRS has the ability to show the scale speed of the locomove 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 throle)
unl the train begins to move, then turn the “0” adjust knob unl the speedometer
just starts to move.
4. Increase the throle so that the train is moving at a medium speed. Time the
amount of me 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. Connue 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 , you use 10 gauge wire. Although the track itself is
similar to a very heavy gauge wire, in larger layouts, signicant loss can occur from the connecons
between secons of track. To improve this, run mulple power connecons 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 operaon
Garden railways are oen 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 le outdoors when not in use. To make this easy, the connecons 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  23.5  22  16.5  11  8, 3ins 6 
Table A