Updating the Zimo equipped Class 66 with Yard mode lighting and a speculative super-shunter lighting option.

 

Introduction:

The Zimo equipped Class 66 locos are updated once again, to add "Yard Mode" and "Super Shunter" lighting options.

Recent inputs from loco drivers on the RMweb site indicate that when picking up or dropping trains in the yard, headlights are switched off to avoid dazzling the yard staff. This results in "Yard Mode" lighting, with forward markers and rear lights active, but no headlights.

Occasionally, with the demise of dedicated small shunting locos such as the previously ubiquitous Class 8, large freight diesels are used to assemble trains within the yard. When undertaking this task, the preferred lighting arrangement is to display red rear lights and white marker lights simultaneously at both ends of the locomotive. However, if modern dual function LED combined rear / marker lights are in place on the locomotive, this arrangement is not possible. However, a little imagination results in these lights emitting alternate red and white flashes, providing an effective equivalent set of warning lights. Hence "Super Shunter" Mode.

However

The Hardware update:

No hardware changes are required for the DB Schenker Class 66/0 locos, which have separate rear lights and lower marker lights.

However, for the later build 66s fitted with dual function combined lower front marker lights with integral rear lights, changes are needed to provide flashing marker/rear lights for shunting:

The previous double strobe headlight warning is clearly far too bright to be a viable lighting regime for yard use. The double strobe output on F4 is therefore sacrificed and replaced with a 1 to 1 mark-space waveform. This waveform is directed at the lower marker lights and in antiphase to the rear lights, via steering diodes.

Revised Circuit diagram for later build Class 66 locomotives with dual lights:

 

 

 

 

CV Programming Changes:

 

Summarising the lighting requirement:

a) Early Class 66/0 

Swiss Group Function Key Lighting mode Description Forward 1 Forward 2 Reverse 1 Reverse 2
1 F0 Parking Rears FO7 FO8 FO7 FO8
3 F20 End 1 & Yard Mode FO(H/L) FO3 FO7  
4 F21 End 2 & Yard Mode   FO8 FO(R/L) FO3
5 F22 Day Headlights FO1   FO1  
6 F23 Night Headlights FO2   FO2  
7 F24 Double Strobe Headlights FO4   FO4  
8 F25 Super Shunter FO(R/L)   FO(H/L)  
2 F19 Cab Light FO5 FO(H/L)    
9 F17 Detonator Flash    (F16 M-key) FO6      

 

b) Later Class 66/9 etc (with dual function rear/front markers)

Swiss Group Function Key Lighting mode Description Forward 1 Forward 2 Reverse 1 Reverse 2
1 F0 Parking Rears FO7 FO8 FO7 FO8
3 F20 End 1 & Yard Mode FO(H/L) FO3 FO7  
4 F21 End 2 & Yard Mode   FO8 FO(R/L) FO3
5 F22 Day Headlights FO1   FO1  
6 F23 Night Headlights FO2   FO2  
7 F25 Super Shunter FO(H/L) FO(R/L) FO(H/L) FO(R/L)
8 F25 FO4   FO4  
2 F19 Cab Light FO5 FO(H/L)    
9 F17 Detonator Flash    (F16 M-key) FO6      

 

Common CV Elements:

CV131=60 to automatically switch off the cab light (FO5) when the loco is on the move.

 

Early Class 66/0:

CV130=20

 

Later Class 66/9 etc:

CV130 to zero to remove previous double strobe output.

CV118 defines FO to flash... for FO4, value=32

CV117 defines flashing waveform...  for 1/2 sec on and 1/2 sec off, value = 55

 

Swiss Mapping CVs:

Description CV Early 66/0 value Late 66/9 etc value
Group 1      F-Key 430 29 29
M-Key 431 0 0
1st fwd FO 432 7 7
2nd fwd FO 433 8 8
1st Rev FO 434 7 7
2nd Rev FO 435 8 8
Group 2     F-Key 436 19 19
M-Key 437 0 0
1st fwd FO 438 5 5
2nd fwd FO 439 14 14
1st Rev FO 440 0 0
2nd Rev FO 441 0 0
Group 3      F-Key 442 20 20
M-Key 443 0 0
1st fwd FO 444 14 14
2nd fwd FO 445 3 3
1st Rev FO 446 7 7
2nd Rev FO 447 0 0
Group 4      F-Key 448 21 21
M-Key 449 0 0
1st fwd FO 450 0 0
2nd fwd FO 451 8 8
1st Rev FO 452 15 15
2nd Rev FO 453 3 3
Group 5      F-Key 454 22 22
M-Key 455 0 0
1st fwd FO 456 1 1
2nd fwd FO 457 0 0
1st Rev FO 458 1 1
2nd Rev FO 459 0 0
Group 6      F-Key 460 23 23
M-Key 461 0 0
1st fwd FO 462 2 2
2nd fwd FO 463 0 0
1st Rev FO 464 2 2
2nd Rev FO 465 0 0
Group 7      F-Key 466 24 25
M-Key 467 0 0
1st fwd FO 468 4 14
2nd fwd FO 469 0 15
1st Rev FO 470 4 14
2nd Rev FO 471 0 15
Group 8      F-Key 472 25 25
M-Key 473 0 0
1st fwd FO 474 15 4
2nd fwd FO 475 0 0
1st Rev FO 476 14 4
2nd Rev FO 477 0 0
Group 9      F-Key 478 17 17
M-Key 479 144 144
1st fwd FO 480 6 6
2nd fwd FO 481 0 0
1st Rev FO 482 0 0
2nd Rev FO 483 0 0

 

Revised Function Mapping:

Key Action
0 Parking rears
F1 Engine start/stop
F2 Brake
F3 Horn hi tone (playable)
F4 Horn lo tone
F5 Light engine load (50% momentum)
F6 Force engine to idle independent of speed control
F7 Engine ramp to notch 1 independent of speed control
F8 Engine ramp to notch 2 independent of speed control
F9 Engine ramp to notch 3 independent of speed control
F10 Engine ramp to notch 4 independent of speed control
F11 Flange squeal
F12 Spirax valves
F13 Door open & slam
F14 Pre-start sounds / post start sounds
F15 Buffering-up / coupling
F16 Triple detonators
F17 Detonator flash LED
F18 Brake air release
F19 Cab light (forward & stationary only)
Select which end(s) require lights (one end or both)
F20 End 1 yard mode lights
F21 End 2 yard mode lights
Select Day OR Night Headlights
F22 Day headlights
F23 Night headlights
OR, select specialised lighting
F24 Double Strobe headlights - (Early Class 66/0 only)
 F25 Super shunter mode lights (add F20,21 & 0 for 66/0)

                                           (add F25 + F0 for later 66s)

F0 Parking rears both ends
F27 Volume down
F28 Volume up

 

Lighting mode Descriptions and key combinations:

Lighting mode : Early 66/0 Key combination

Late 66/9 etc Key combination

Cab light (driver's end only)           19 (fwd only) 19 (fwd only)
Parking rears both ends 26 26
Day running Lights (light engine)      20,21,22 20,21,22
Night Running Lights (light engine)    20,21,23 20,21,23
Train Haul day (coupled at end 2)     20,22 20,22
Train Haul night (coupled at end 2)    20,23 20,23
Yard mode light engine 20,21 20,21
Yard mode train haul 20 20
Super shunter 20,21,25,26 25, 26
Double strobe headlights with markers 20,21,24

Not available

 

 

Class 66/0 :

Yard Mode

 

Day running lights

 

Night running lights

Super Shunter Mode

 

 

Class 66/9 etc (dual marker/rear lights) :

 

Yard Mode

 

Day running lights

 

Night running lights

 

Half a second with lower markers on

Half a second with rear lights on

 

Super Shunter Mode with alternate flashes of red and white.

 

 

Supplier website links:  

 

Digitrains A good source of all things DCC including pre-wired chip LEDs from DCCC and Zimo decoders.
Rapid Electronics A good low cost, high speed supplier of electronics components etc
Maplin A convenient local source for electronic components such as resistors and transistors (but at a cost)

 

 

 

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