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PM74
Features:
▪
4 Power manager sub-districts (or DS sections), similar to PM42.
▪
Each DS section configurable for Auto-reverse or intelligent
short-circuit Power Management function.
▪
Each DS has Occupancy and Transponding detection capability.
▪
Occupancy usable by LocoNet compatible signal systems and e.g. PC-
based track state monitoring.
▪
Transponding provides mobile decoder Mainline Operations Mode
CV read/write programming on compatible Digitrax systems.
▪
Transponding identifies compatible Decoder addresses in each DS.
▪
All plug-in connectors for simple and easy installation and service.
▪
User defined as 4 DS reporting addresses in 2000+ DS range.
▪
Low-loss magnetic sensing of DCC track current.
▪
Easy setup with device Option Switches (OPSW) or LocoNet CV
programming.
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Powered by DCC track and 2mm DC jack, 10V min to 22V max.
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Configured to operate with DCS52, DCS100, DCS210, DCS210+,
DCS240 Command Stations, and DB210 and DB220 boosters.
▪
Optional Detection and Power status led connector for remote state
indication, compatible with e.g. LT5.
▪
Additional LocoNet Configuration modes using DT602 throttles.
Parts List
1 PM74 Power Manager
1 Instruction Sheet
1.0 PM74 Initial Setup.
To install the PM74 and begin using on your LocoNet layout.
1.
Figure 1 shows the recommended connections to operate the PM74 on a
LocoNet layout, with several track connection types shown.
2.
For initial testing, connect power from a compatible DCC booster track-bus
feed via the RA/RB terminals of the PM74's 2-pin track power plug.
3.
When powered, the green ID LED should light and will briefly wink OFF at
about 2 secs as a 'heartbeat' showing the unit is powered and operational.
Additionally the ZN or Zone LED on the left front of the unit will light green,
showing DCC packets are being detected on the 2-pin RB terminal.
4.
For best operation reliability an optional PS14 or similar DC 12V/300mA
© 2022 Digitrax, Inc.
Complete Train Control
Run Your Trains, Not Your Track!
Power Manager with Occupancy and Tran-
sponding detection for 4 sub-districts
— 1 —
4 4-pin DS plugs
1 2-pin Track power plug
www.digitrax.com
.
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Summary of Contents for Digitrax PM74
- Page 1 1.0 PM74 Initial Setup. To install the PM74 and begin using on your LocoNet layout. Figure 1 shows the recommended connections to operate the PM74 on a LocoNet layout, with several track connection types shown. For initial testing, connect power from a compatible DCC booster track-bus feed via the RA/RB terminals of the PM74's 2-pin track power plug.
- Page 2 © 2022 Digitrax, Inc. — 2 — www.digitrax.com...
- Page 3 Plug in an active LocoNet to either PM74 RJ12 connector. The red OPS LED will light up when connected. Any good LocoNet message seen will cause the red PM74 OPS LED to blink OFF briefly. With no LocoNet the PM74 will still provide Power Management, with Occupancy and Transponding detec- tion indicated on just the status LEDS.
- Page 4 Since DS3 and DS4 RB currents are not being monitored any faults on these RB rails of are not protected by the PM74, and so rely solely on the Booster fault protection capability. Now RB faults in DS3 and DS4 disrupt the DCC power to all tracks on the booster.
- Page 5 Press the OPS button for about 3 seconds until the green ID and OPS LEDs blink together. Release the OPS button. The PM74 is now setup to configure OPSW's by sending the required SW# as Closed (C) or Thrown(T) to setup an option.
- Page 6 1st problem PM74 shown in red. Press the number 5 then press the A soft key "Chng Adr". The 2nd PM74 will now change to Base SW5, and now the 1st PM74 will show GREEN because there are now no DS/SW overlaps to the next PM74.
- Page 7 DCC output, or low DC power input to allow an adequate fault current. A PM74 will operate on DCC 2-pin track power without DC power input to the 2mm jack, but control may fail due to track power interruptions from complex fault sequences.
- Page 8 IPL capable products like the PM74 & DT602 may be user field updated with the latest IPL files that are available for free on the product specific information pages of the www.digitrax.com web site.
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