Sharp DV-MX1U User Manual download pdf (Page 13)

LokSoundXL User Manual V2.1 05/2002

How to switch on load control

control was optimized and tested with motors from

ROCO, Bachmann (Liliput), BRAWA, Märklin®, LGB,

Buehler, Mabuchi.

Load control may be deactivated completely (if so

desired).

Make sure that load control is always turned off

when using AC motors - no matter what settings

are used. AC motors are not suitable for load

control.

How to switch on load control

Set the first Bit of CV 49. Read out the CV: load

control is deactivated if the value is 0 or 2. To activate

just add 1 to the actual value and enter.

Example: CV 49 reads 2.

To activate load control set CV 49 to 3.

You find a detailed description of all possible values

for CV49 in chapter 7.1.1

Parameters of Back EMF control

The internally used PI-control algorithm of Back EMF

control depends on 3 parameters: the control

reference voltage is stored in CV 56, the control

parameters are in CVs 57 and 58.

Reference voltage: In CV 56 you set the voltage that

should come back from the motor. This value depends

on track voltage and efficiency of the motor. An

efficiency of 75 % and a track voltage of 16 V adds

up to a voltage of 16V*75%=12V,which needs

to be written into CV 56. The voltage (here: 12 V)

may be entered in 0.1 V-increments. This results in a

value of 120 (12V * 10) for CV 56. If you don't know

the exact efficiency of the motor you may obtain the

value by the following experimental method:

Check, if the locomotive really reaches the top speed

in the last speed step or if you cannot detect any

speed changes at the higher speed steps. In the latter

case you have to reduce the value for CV 56, in the

first case increase the value.

If you enter '0" in CV 56, the LokSoundXL decoder

will find a value, from track voltage and an assumed

efficiency.

The internal PI-control of LokSoundXL decoders may

be adjusted with CV 57 and CV 58. Depending on the

type of motor the parameters may have to be adjusted

achieve optimal driving performance.

LokSoundXL decoders are factory pre-set for the

use with Bühler motors, e.g. from LGB or other

manufacturers.

•Parameter 'K", stored in CV 57 , influences how

strongly load control will effect the driving

performance. The higher the value, the more the

load control will respond to changes. Adjust this

value with consideration, because higher values

could lead to irregular and "hard" driving

performance. If you prefer a smooth running try

to reduce the value step by step until you reach an

optimum.

•Parameter "I", stored in CV 58 provides important

information to the LokSoundXL decoder regarding

the type of motor used: certain electric motors

respond differently to adjustments of the rpm's.

The longer a motor takes to respond the lower the

value in CV 58. However, it is not easy to recognize

the grade of slowness. In general: the more poles a

motor has and the bigger it is, the more fly wheels,

the slower it is and the lower the value should be

set in CV 58.

For optimal programming set CV 57 to a low value

e.g. 50. Leave the value for CV 58 ("I) unchanged and

start testing. Now change the value of CV 58 in steps

of 25 upwards or downwards and see if you get a

better driving performance. If there is no change leave

the value of CV 58 and change the value of CV 57

(intensity of control) to reach the optimum.

Please note, that incorrectly set parameters may

impede the effect of Back EMF control and

possibly cause the motor to stop altogether. Refer

to our website http://www.loksound.de for a

guide to some pre-calculated parameters for

commonly used motor / drive combinations.

Parameters for Bühler motors

Locomotives with a motor made from Bühler are used

by LGB and should be programmed as follows:

CV 57 (‘K’) = 30

CV 58 (‘I’) = 120

Parameter for for Mabuchi RS385SH

This motor is used by Märklin® in the Maxi ond Spur

1 or Bachmann.

CV 57 (‘K’) = 50

CV 58 (‘I’) = 110

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Sharp DV-MX1U User Manual Page 13

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