BEMF on Spectrum sound class J

[bmjcook]

Gidday all
                  How does one go about setting the BEMF feature on the Class J loco that has the Tsunami sound decoder onboard? I have read the instructions that are on the CD that comes with the loco but I cannot get the feature to work. All I wish to do is set the BEMF on full all the time. What CV and value should I use? Thank you in anticipation
                                                                                                 Cookie

[ABC]

Here are all the CVs or use this link for a PDF http://www.bachmanntrains.com/home-usa/dwg/Sound_Decodesr_CV_DFLT.pdf
BEMF related Cvs are in Bold and Blue.

/******************************************************************************
*
* Bachman OEM Decoder CV Default Value Definitions
* July 28, 2006
* (c) 2006 SoundTraxx
*/
PRIM_ADDR 0x03 /* CV 1, Primary Address */
VSTART 0x00 /* CV 2, Vstart */
ACCEL_RTE 0x00 /* CV 3, Baseline Acceleration */
BRAKE_RTE 0x00 /* CV 4, Baseline Braking Rate */
MFG_VER_CODE VER_ID0 /* CV 7, Manufactuer Version Code */
MFG_ID_CODE 141 /* CV 8, Manufacturer ID Code */
/* MOTOR CONTROL CVs */
MTR_PWM_PER 180 /* CV 9, PWM Period */
BEMF_CUTOUT 0 /* CV 10, Back EMF Cutout */
PACKET_TIME_OUT 0 /* CV 11, Packet Time-out Value */
/* ANALOG MODE CVs */
ALT_PWR_SRC 0x01 /* CV 12, Alternate Power Source */
ANALOG_MODE_FUNC1 0x00 /* CV 13, Analog Mode Functions */
ANALOG_MODE_FUNC2 0x03 /* CV 13, Analog Mode Functions */
/* SECURITY CVs */
CV_UNLOCK_CODE 0 /* CV 15, CV Unlock Code */
CV_LOCK_ID 0 /* CV 16, CV Lock ID */
/* EXTENDED OPERATION CVs */
EXT_ADDR_MSB 0xC0 /* CV 17, Extended Address MSB */
EXT_ADDR_LSB 0x03 /* CV 18, Extended Address LSB */
CONSIST_ADDR 0 /* CV 19, Consist Address #1 */
CONSIST_FUNC_GRP1 0 /* CV 21, Consist Function Active */
CONSIST_FUNC_GRP2 0 /* CV 22, Consist FL Func. Active */
CONSIST_ACCEL_RTE 0 /* CV 23, Consist Acceleration */
CONSIST_BRAKE_RTE 0 /* CV 24, Consist Braking Rate */
SPD_TBLE_SEL 0 /* CV 25, Speed Table Select */
CVAR_29 6 /* CV 29, Configuration Byte 1 */
ERR_INFO 04 /* CV 30, Error Information */
/* FUNCTION MAPPING CVs */
FL_F_MAP 0x01 /* CV 33, FL(f) Output Location */
FL_R_MAP 0x02 /* CV 34, FL(r) Output Location */
F1_MAP 0x08 /* CV 35, F1 Output Location */
F2_MAP 0x04 /* CV 36, F2 Output Location */
F3_MAP 0x10 /* CV 37, F3 Output Location */
F4_MAP 0x20 /* CV 38, F4 Output Location */
F5_MAP 0x02 /* CV 39, F5 Output Location */
F6_MAP 0x04 /* CV 40, F6 Output Location */
F7_MAP 0x10 /* CV 41, F7 Output Location */
F8_MAP 0x20 /* CV 42, F8 Output Location */
F9_MAP 0x01 /* CV 43, F9 Output Location */
F10_MAP 0x04 /* CV 44, F10 Output Location */
F11_MAP 0x80 /* CV 45, F11 Output Location */
F12_MAP 0x10 /* CV 46, F12 Output Location */
ANALOG_FUNC_CH 0 /* CV 47, Analog Whistle Channel */
/* LIGHTING CONTROL CVs */
FL_F_LGHT_CONFIG 0x01 /* CV 49, Head Light Control */
FL_R_LGHT_CONFIG 0x01 /* CV 50, Rear Light Control */
FLASH_RATE 0x03 /* CV 59, Lighting Flash Rate */
XING_HOLD_TIME 0x04 /* CV 60, Grade Crossing Hold Time */
/* MISC. CONTROL */
F11_BRAKE_RATE 0x00 /* CV 61, F11 Braking Rate */
XPNDR_CTRL 0x00 /* CV 62, Transponder Contro l */
/* ANALOG MODE MOTOR CONTROL */
ANA_MODE_VSTART 20 /* CV 63, Starting Voltage */
ANA_MODE_VMTRMAX 180 /* CV 64, Maximum Motor Voltage */
/* SPEED TABLE */
KICK_START 0 /* CV 65, Kick Start */
FWD_TRIM 0x80 /* CV 66, Forward Trim */
SPD_TBL_0 9 /* CV 67, Speed Table */
SPD_TBL_1 18 /* CV 68 */
SPD_TBL_2 27 /* CV 69 */
SPD_TBL_3 36 /* CV 70 */
SPD_TBL_4 45 /* CV 71 */
SPD_TBL_5 55 /* CV 72 */
SPD_TBL_6 64 /* CV 73 */
SPD_TBL_7 73 /* CV 74 */
SPD_TBL_8 82 /* CV 75 */
SPD_TBL_9 91 /* CV 76 */
SPD_TBL_10 100 /* CV 77 */
SPD_TBL_11 109 /* CV 78 */
SPD_TBL_12 118 /* CV 79 */
SPD_TBL_13 127 /* CV 80 */
SPD_TBL_14 137 /* CV 81 */
SPD_TBL_15 146 /* CV 82 */
SPD_TBL_16 155 /* CV 83 */
SPD_TBL_17 164 /* CV 84 */
SPD_TBL_18 173 /* CV 85 */
SPD_TBL_19 182 /* CV 86 */
SPD_TBL_20 191 /* CV 87 */
SPD_TBL_21 200 /* CV 88 */
SPD_TBL_22 209 /* CV 89 */
SPD_TBL_23 219 /* CV 90 */
SPD_TBL_24 228 /* CV 91 */
SPD_TBL_25 237 /* CV 92 */
SPD_TBL_26 246 /* CV 93 */
SPD_TBL_27 255 /* CV 94 */
REV_TRIM 0x80 /* CV 95, Reverse Trim */
/* USER INFORMATION */
USER_ID_1 04 /* CV 105, User Identifier #1 */
USER_ID_2 12 /* CV 106, User Identifier #2 */
/* SOUND CONTROL */
SND_CONFIG_1 1 /* CV 112, Sound Configuration 1 */
QUIET_MODE_CTRL 0 /* CV 113, Quiet Mode Control 2 */
BELL_RING_RATE 04 /* CV 114, Bell Ring Rate */
WHISTLE_SEL 0 /* CV 115, Whistle Select */
EXHAUST_CTRL 80 /* CV 116, Exhaust Control */
MASTER_VOL 255 /* CV 128, Master Volume Control */
MIXER_CH0 225 /* CV 129, whistle volume */
MIXER_CH1 128 /* CV 130, bell volume */
MIXER_CH2 192 /* CV 131, chuff volume */
MIXER_CH3 48 /* CV 132, airpump volume */
MIXER_CH4 32 /* CV 133, dynamo volume */
MIXER_CH6 32 /* CV 135, rod clank volume */
MIXER_CH7 128 /* CV 136, steam hiss volume */
MIXER_CH8 128 /* CV 137, coupler volume */
MIXER_CH10 128 /* CV 139, brake squeal volume */
MIXER_CH11 64 /* CV 140, brake release volume */
MIXER_CH12 64 /* CV 141, snifter valve volume */
MIXER_CH13 64 /* CV 142, pwr reverse volume */
MIXER_CH17 96 /* CV 146, water stop volume */
/* DYNAMIC DIGITAL EXHAUST */
DDE_T_GAIN 10 /* CV 177, DDE Throttle Sensitivity */
DDE_L_GAIN 32 /* CV 178, DDE Load Sensitivity */
DDE_ATTACK 10 /* CV 179, DDE Attack Time Constant */
DDE_RELEASE 10 /* CV 180, DDE Decay Time Constant */
DDE_EXH_LO_LMT 255 /* CV 181, DDE Exh Lower Volume Lmt */
DDE_EXH_HI_LMT 255 /* CV 182, DDE Exh Upper Volume Lmt */
DDE_ROD_LO_LMT 255 /* CV 183, DDE Rod Lower Volume Lmt */
DDE_ROD_HI_LMT 255 /* CV 184, DDE Rod Upper Volume Lmt */
DDE_OFFSET 42 /* CV 185, DDE Filter Initial Freq */
DDE_GAIN 64 /* CV 186, DDE Filter Slope */
DDE_DAMPING 255 /* CV 187, DDE Filter Damping */
DDE_TRACKING 102 /* CV 188, DDE BEMF Trking Constant */
DDE_TRKING_OFFSET 0 /* CV 189, DDE BEMF Tracking Offset */
/* AUTOMATIC SOUND CONTROL */
V_BELL_ON 15 /* CV 193, Bell On Voltage */
V_BELL_OFF 19 /* CV 194, Bell Off Voltage */
WH_SENSTVTY 4 /* CV 195, Xing Whistle Sensitivity */
BRK_SENSTVTY 3 /* CV 196, Brake Squeal Sensitivity */
ANA_AUTO_SND_EN 22 /* CV 197, Analog Auto Snd Enable 1 */
DCC_AUTO_SND_EN 8 /* CV 198, DCC Auto Snd Enable 1 */
/* BACK EMF CONTROL */
KP 25 /* CV 209, PID Kp Coefficient */
KI 20 /* CV 210, PID Ki Coefficient */
KD 0 /* CV 211, PID Kd Coefficient */
BEMF_INTENSITY 255 /* CV 212, BEMF Feedback Intensity */
BEMF_SAMPLE_PER 15 /* CV 213, BEMF Sample Period */
BEMF_APERTURE_TIME 15 /* CV 214, BEMF Sample Window Size */
BEMF_GAIN 0 /* CV 215, BEMF Gain Coefficient */
/* End of File ***************************************************/

[richg]

The BEMF issue is being discussed extensively in the SoundTraxx Group and even then, there does not seem to be a good solution that satisfies everyone. Diesels and steam Tsunami. To see the info in the Files and photos sections, you have to join. Someone is putting settings in the Files section mainly.
Many, many opinions, examples and a lot of discussion. Go look at the messages in the below link.

http://groups.yahoo.com/group/soundtraxx/

Rich

[bmjcook]

Gidday
               Thanks for the information fellas. I will look into it more closely. I have been told to put a value of 126 into CV10. I tried this and it seems to work at the moment. I will let you know what evenuates.
                                                                                           Cookie         

[richg]

The below is from Bruce who use to run Litchfield Station DCC site. This was just on the Yahoo SoundTraxx DCC Group.

Rich
--------------------------------------------------------------------------------------------------------------------

When 209 and 210 get below 5, the granularity of them becomes too big.

  For example, with 210=0, if loco doesn't move on speed step 1/128 with
  209=2, but makes huge jumps, with 209=3, I adjust 212 to say 125. Then
  209 should get it moving about 5 or 6. If it is stopped with 209-5, but
  moves slightly with 209=6, then I start to work on 210. If there is
  still a big jump, I go for 100 or 75 for CV121, etc. I don't believe
  I've ever shipped a loco with CV212 less than 100. And I believe that I
  only adjusted CV212 on a few - less than 10 of the about 300+ that I've
  programmed.

  I've rarely seen 210 go over 40 and NEVER over 100.

  Frequently I see about a 1:2 ratio between 209 and 210: 209=6; 210=14,
  for example.

                                   Bruce Petrarca, Mr. DCC