Digitrax SE74 Manual Download Page 11

© 2022 Digitrax, Inc.

www.digitrax.com

— 11 —

not allow for Lunar lamps. OPSW35 polarity sets RED/GREEN choice.

6.  Be sure to set LED polarity/type: OPSW33/34/35 to your actual signals.
7.  The SE74 is setup to drive LEDS only, using external customer current set

-

ting resistors with about 5 volt unloaded drive levels.

8.  For more signaling accessories and more information, see the Signaling 

section of the 

www.digitrax.com web site.  If you need larger images, color or 

text, reference the pdf of these instructions on the web site.

8.0 Setup Notes:  

The SE74 manages turnout voltages and current. 

1. 

In pulse solenoid mode; for problem solenoids, try OPSW16=C for higher 

current Capacitive Discharge pulse action. 

2.  In all modes a 12-14V DC 0.3A supply should suffice, depending on the Sig

-

nal head brightness setting. 

3.  If you operate a SE74 with just DCC track power on TKA/TKB terminals, it 

will not have all features available.

4. 

For 2-wire pulse solenoids, e.g. a Kato N-crossover, just wire to R/G termi

-

nals in the polarity that operates as you need.  Do not run more than one 

solenoid device per SE74 pulsed R/G output pair.

5.  The combined  Static turnout/Lamp and Signal mast loads should set less 

than 0.30A draw on the DC input.  For Slow motion turnouts the total 

current per output R/G pair ON should draw less than 0.05A referred to DC 

input plug.

6.  Take care not to short any of the SE74; SE1 cables, R/G Outputs and P+ 

leads, or connect to other voltages like DC, Track power etc.  This may cause 

damage not covered by Warranty.

7.  If the SE74 flashes the "Ident" pattern of ID & RTS LEDs alternating with 

OPS LED  for 3 seconds it has detected an overload and has shutdown P+ 

voltage. Identify the overload and fix this before resuming operation.

8. 

The Digitrax original SE1 cable design has the multiplex symmetrical so the 

A/D and B/C masts can be rotated and alternately tested in a single socket. 

FIGURE 8: A/D direction Dual 2-wire searchlight heads 

FIGURE 9: B/C direction Dual 2-wire searchlight heads 

Summary of Contents for SE74

Page 1: ...y wink OFF every 2 secs as a product heartbeat showing the SE74 is operational Alternatively power from DCC feeder wires to the TKA B terminals 3 Plug in an active LocoNet to a SE74 RJ12 connector The...

Page 2: ...om SW257 on that control heads 1 16 consecutively with 2SW per head Each SE74 uses 36 total consecutive SW addresses 2 The SW257 264 settings control heads 1 A1 Main 2 A2 Dwarf 3 Main B DC in Complete...

Page 3: ...74 turnouts can be Broadcast setup by turnout1 SW2041 through turn out4 SW2044 10 SW1024 C turns ON Aspect Exercise cycles SW1024 T turns OFF A double click of the ID button will toggle Exercise ON OF...

Page 4: ...e ID and OPSW LEDs will blink alternately to show one Route can be set up Release the RTS button 2 Select a switch address on your throttle between 1 and 8 and issue the command direction for Closed T...

Page 5: ...in BOLD 5 OPSW s not in this table are reserved and should be kept at Factory default T settings for predictable operation 6 OPSW40 C will reset to Factory defaults on OPSW mode exit Table 1 SE74 OPSW...

Page 6: ...nnected to LocoNet this will occur as a SW message to make the change and notify the system it has occurred Wire to momen tary press on buttons for SW control 2 The pins SENS1 SENS2 SENS3 and SENS4 wi...

Page 7: ...means the 2nd SE74 SW aspect Base would need to be 17 or higher 5 Use the LH encoder knob to scroll up and down through the detected SE74 devices with an underline shown at the 2nd SE74 6 At the 2nd...

Page 8: ...suitable DT602 plugged into LocoNet press the Menu 3 4 keys to enter Route Editor menu If any SE74 is on LocoNet the DT602 will beep after about one second and show DS7x routes at the D soft key posit...

Page 9: ...e CV s ac tually each control 8 individual OPSW bits OPSW1 is ls bit of CV11 through OPSW8 as ms bit of CV11 5 The DT602 does not indicate to the SE74 when programming is complete After finishing CV c...

Page 10: ...n for wiring detail and are not installed on the PCB test mast 4 The 3 wire Searchlights of Figures 6 and 7 are common cathode version and allow Lunar lamps to be connected for all 4 heads on an SE1 c...

Page 11: ...features available 4 For 2 wire pulse solenoids e g a Kato N crossover just wire to R G termi nals in the polarity that operates as you need Do not run more than one solenoid device per SE74 pulsed R...

Page 12: ...ty to operate under and be in compliance with CFR 47 rules as administered by the Federal Communication Commission Digitrax believes any conscientiously installed equipment following guidelines in thi...

Reviews: