BRIDGEWERKS Magnum 20 SRM 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.
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 SRM Controller
20 Amp, Power Controller with Meters
User Manual
Family owned and operated since 1995

Magnum 20SRM Features
• Connecons:
On the rear of the Magnum 20-SRM there is a pair of connectors labelled ‘TO TRACK’ which you use to
connect the Magnum SR 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 SRM 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 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 20-SRM features a momentum control which 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 20 SRM 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. Turning the switch to Reverse will also reverse the direcon of the train.
• Overload Protecon:
In the event of an overload, the Magnum 20-SRS has two dierent ways of protecng itself and your
train 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 Magnum SR 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 provide you with wireless remote control over the throle. There is also an accessory special
buon available from Bridgewerks when one of these buons is plugged into the yellow terminals, the
train will not move unless the buon is being held in. This is a nice way to give children access to con-
trolling the train with the speed parameters sll under control.
• Wire:
Use heavy gauge wire to connect your power controller 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.
• Accessory Power
On the back of the Magnum 20SRM in
addion to the pair of yellow remote termi-
nals, and the terminals that provide power
to the track, there is a pair of terminals for
accessory power. This pair of terminals
provides an unregulated DC power source
that will be from 18 to 30 V depending on
how much power you are drawing from the
connecon. This pair of terminals can be
used to power an accessory such as the MAG
-MATE or UR-15 which give control over an addional track, which allows the ample power of the 20-
SRM to be shared with other tracks as your layout expands.