15
Drawing No. LP1106
Chapter 3 Power and ST-Bus Wiring
Revision B
Power Requirements
ST-IPm-8460
SixTRAK IPm
®
RTU/Controller
Chapter 3 Power and ST-Bus Wiring
Power Requirements
Red Lion SixTRAK IPm RTU/Controller accepts a user DC power source of 10 to 30 VDC or a 24 VDC power from a Red
Lion power supply. Although not required, Red Lion has the following power supplies:
• 24 VDC power supply @ 30 W (NTPS-24-1-3)
• 24 VDC power supply @ 72 W (NTPS-24-3)
• 24 VDC power supply @ 120 W (NTPS-24-5)
Current Requirements
To calculate the current requirements, add the wattage required for the Red Lion SixTRAK IPm RTU/Controller, and
modules in use. Then divide the total wattage by the DC power source voltage. Then add any current needed for user
instrumentation loops.
DC Power Wiring
All Red Lion units and user instrumentation loops may be powered from a single DC source. The user DC power source
must be between 10 to 30 volts.
Wire Gauge Capacity of terminal plug: 12 to 28 AWG (3.31 TO 0.081 mm
2
) copper wire
Torque: 4.4 inch-lbs (0.5 N-m)
Strip insulation back on conductor: 0.25" to 0.27"
Redundant Power Inputs
The Red Lion SixTRAK IPm RTU/Controller has redundant power + input terminals. (There is one common power -
terminal.) This allows you to connect two separate power supplies. If one fails then the other will take over powering your
hardware. The SixTRAK IPm RTU/Controller can also have redundant power inputs but requires an externally wired diode.
See figure below.
Note:
In the SixTRAK IPm RTU/Controller, the ST C (+) and ST D (-) of the SixTRAK ST-BUS are internally connected
to only the primary power input (terminals 2 and 4). Therefore, when running on only auxiliary power (terminals 3
and 4) there will be no power on terminals 16 and 17 (ST C and ST D). If redundant power is desired for the
ST-BUS, it is recommended that the auxiliary power + be connected to terminal 16 through an external diode. The
diode should be appropriately sized (current rating) for the number of legacy SixTRAK I/O modules being powered.