KB942: CV61 - Non-directional Headlights, Transponding, & Split Phase Motor Drive

This article was last updated on Oct. 18, 2010, 6:12 p.m. | Print Article | Leave Feedback

Characteristics Controlled by CV61:

Some Digitrax Decoders use CV61 (one of the manufacturer specific configuration variables) to give you the following options:  Non-Directional Headlight Operation, Transponding Enabled or Disabled, & Split Phase Motor Drive for Märklin AC and Lionel Type motors.

The look up table below shows the effects of different CV values that you can program into CV61.  CV values are shown in hex & decimal are the same in this case.

TABLE 61: CV61 Values

CV 61 Value

Non-directional headlights

Transponding

Split Field Motor/AC

00

No

No

No

01

Yes

No

No

02

No

Yes

No

03

Yes

Yes

No

04

No

No

Yes


Non-Directional Headlight Operation:  Most Digitrax decoders support the independent control of the head light and tail light.  In decoders with this capability, if you don't want automatic reversing headlight operation (the decoder's factory default setting), you can set up the white lead for the headlight to operate on F0 (function 0) and the yellow lead for the rear light to operate independently on F4 (function 4).  This lets the engineer have complete manual control over when these lights are on.

Program CV61 to a value of 01 and the decoder will "map" the normal reverse light function lead (yellow) to be controlled by the F4 function key.  In addition the normal forward light function lead (white) will become a non-directional light lead that is controlled by the F0 (light function) button on the handheld.  The FX operation of the white & yellow leads are still controlled by CV49 & 50.  The FX effects can be made directional if desired by following the FX programming instructions in this manual.  CV50 will still control the FX effect you are using on the yellow lead (F0 reverse headlight) only it will now be controlled by F4 rather than F0).

Program CV61 to a value of 00 and the decoder will return to automatic directional lighting with the white lead being the headlight and the yellow lead being the reverse light.

The non-directional headlight feature is not available on Digitrax DN121 series decoders.

Transponding Enabled/Disabled:  Digitrax decoders with transponding are shipped with CV61 programmed to 00 for transponding disabled. Before implementing transponding, you must enable this feature in the decoders.  Transponding enabled or disabled does not affect operation on non-transponding layouts.

Split Field/AC Motor Drive:  When you program CV61 to 04 Digitrax decoders with split field motor drive capabilities will convert their motor leads to drive a "split field " AC motor instead of the default DC motor.  This lets you run Marklin 3 pole AC motors and similar motors in a number of locos built in Europe with Digitrax 1.5 amp decoders.  For Hi-rail AC motors, you can use Digitrax decoders rated at 3 amps or more.

To use an AC motor, connect the common motor/brush to the blue (lamp common) lead on the decoder.  Connect the forward field coil to the decoder's gray lead.  Connect the reverse field coil to the decoder's orange lead.  Be sure that any other mechanical or electrical reversing relay and/or track feeds are removed from the AC motor.  The decoder's wires should be the only wires connected to the converted AC motor.  Be sure all motor connections are isolated from the motor chassis.

Programming decoders set up for AC operation:  Once you set up your decoder to run with an AC motor by programming CV61, you must have the motor or a lamp load connected from the blue lamp common wire to one of the motor leads to do any additional programming.  You can also connect a 1 k ohm resistor to the blue and gray wires to simulate the AC load to allow additional programming.

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