Model Train Forum banner

21 - 25 of 25 Posts

Registered
Joined
12 Posts
65steam,
Smarter people then me have already given you great advice. I would add that if you ever plan to run a DCC engine, on your DC layout, which works fine, the controller must not emit a pulse signal. The MRC Tech 7 doesn't. The Tech 4 does and I don't know about Tech II. That was what I was told by Bachmann, for running their Sound Value engines and by MRC, when I inquired as to which controller did not emit pulse signals. Glenn
 

Registered
Joined
784 Posts
Hi Glenn, did MRC give you any inkling as to what in blue blazes is meant by their "Accutech" and "Proportional Tracking Control" ?
I think it has to be some kind of pulsed power, maybe not PWM, but some kinda sumthing!! 馃槀 Not just variable DC....
 

Registered
Joined
12 Posts
MRC did not address either of those features, but my Tech 7 controller has both. So, it has nothing to do with pulse signals. I will say that both features make my locos run more realistically. Certainly much better than my Tech 4 did.
Glenn

The following was the description for the Tech7, on the MRC website:

Bristling with advanced control features, this unit delivers maximum railroading realism. For example, one of its key features is momentum control, sometimes referred to as flywheel action.

INPUT:120 VAC 60 Hz
OUTPUT: 23 VDC, 18.5 VAC
TOTAL OUTPUT: 20 VA


  • Accutec Technology - provides smoother performance and helps maintain the extra power when climbing grades or running over poor track conditions
  • Proportional Tracking Control an innovative system of control that yields the most responsive, realistic model train operation
  • Automatic Circuit Protector automatically disconnects power to the track to protect your equipment if overload occurs
  • Main Line Direction Switch throw the switch to reverse direction of the loco
  • More Powerful than others in its class with power to pull heavy loads and operate accessories
  • Advanced Slow Speed Circuitry so your loco can crawl and couple easily
  • Pressure Sensitive Braking puts you in command of accurate steady deceleration, providing gradual, slow speed braking from any speed
  • Momentum Control with on and off switch
  • Indicator Lights for momentum, power output, and overload conditions keeping you informed of your layout status
  • Fixed A.C. Terminals for powering switch machines, lights and other accessories
  • 300 Degree Speed Control uses 300 degree throttle for an extended range of control
Here's how momentum works in Tech 7: When a real locomotive is given a throttle increase there is a lag time until the preselected speed is reached. Likewise, when braking a life-size, fast moving train it usually takes a mile or so before it stops. But because lightweight model trains won't mimic this delay on their own, we create the momentum or inertia electronically. When you increase throttle position on a momentum equipped train control, or operate the brake, a delay circuit slows the rate of track voltage change. This train control is equipped with a switch to bypass the delay circuitry for yard work or switching which require quick throttle reaction.
 

Registered
Joined
784 Posts
I managed to find this:
"When Accutec Technology detects a sudden change in load, it instantly audits your throttle setting and compensates for the new demand"
Nothing technical, but at least a minimum description...That 760 seems to be a real quality controller; I guess they feel like they need their secrets!! 馃ぃ
 

Registered
Joined
12 Posts
cid,
As I said the Tech 7 760 is lightyears ahead of my old Tech 4, which I still use on my workbench. You can actually see the changes in momentum, as the train makes its way around the layout. If you have grades it looks awesome. Glenn
 
21 - 25 of 25 Posts
Top