MTH Electric Trains PA B-Unit Specifications download pdf (Page 13)

Running the Engine

Set the engine on the rails, and apply DC power. Refer to the Set-Up section of

this guide for instructions on how to lubricate the chassis.

As you increase power, at about 6 volts, the lights and sounds will come on. Keep

going on up to about 8 and she'll move out! About 16 volts DC is adequate for

prototypical speeds however, your engine can handle up to 24 volts DC if you feel

the need for speed!

Changing Direction

If you flip the direction (polarity) switch on your power pack while the engine is

moving, it will gradually slow to a stop, and slowly accelerate back up to speed in

the opposite direction. This is an exclusive feature of MTH engines that we're sure

you'll enjoy. You can also change direction the old fashioned way by reducing

throttle until the engine stops, flip the direction switch, and then increase throttle

again. Either way is OK, we just thought a graceful transition from any speed

would be cool.

If you switch track polarity too slowly, the engine may stop abruptly and not move

in the reverse direction. This is normal. There is a feature we call “anti-jack

rabbit” that prevents the engine from taking off at high speeds when high voltage

is applied to the track instantly. Some direction switches have a “dead” spot where

the power is completely off during polarity changes. This can invoke the anti-jack

rabbit feature. The solution is to flip the direction switch more quickly. Don't

worry you won't hurt the engine.

Speed Control

Your engine is equipped with speed control. This feature is always active, even in

analog DC mode. Basically, your engine constantly measures track voltage and

converts this to a digital speed command. You should notice the speed remains

constant up and down grades, around curves, and with varying loads. This is no

accident. You've got the most precise speed control system available today.

A-B, A-A, A-B-A Configuration

Your Diesel A and B units both have full PS3.0 electronics installed in them. That

means you essentially have two independent engines you can run. As you apply DC

voltage to the track both engines will start-up and begin moving. In the case of

your B-unit, its running direction will depend upon which orientation you have it

sitting on the track. If you notice the B-unit running the opposite direction from

the A-unit then simply remove track power, flip the B-unit around on the track,

couple it to the A-unit, re-apply DC track power and you now have it aligned

properly to run in an A-B configuration.

If you wish to add another PS3.0 A-unit to make an A-B-A configuration all you

need to do is set the engine on the track, couple it to the B unit (or other A unit),

apply power and it will run in the correct direction.

Note – Lighting will be dependent upon direction on the A-units.

M.T.H. HO Alco PA/PB Diesel Engines

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MTH Electric Trains PA B-Unit Specifications Page 13