7
Electrical Connections
The TI-500 RFTM module requires an external 6VDC power supply. Single channel units re-
quire about 60 mA of current to drive four 350-ohm load cells (20 mA plus 10 mA per load cell).
Dual channel units require about 100 mA of current to drive eight 350-ohm load cells.
The TI-500 RFTM module will operate normally down to approximately 4 VDC whereupon it will
indicate a low battery condition.
The power leads are pre-wired to the inside of the TI-500 RFTM. The red lead goes to the posi-
tive DC terminal while the black lead goes to the negative DC terminal.
The TI-500 RFTM module also has at least one load cell input terminal or wiring harness. Each
terminal or harness can drive up to four 350-ohm load cells. The terminals are spring loaded; to
open, use a small screwdriver to press down on the orange tab. The harnesses should be
spliced to the load cell or j-box using the supplied butt splices.
Load Cell Input Terminal
Marking
Wire Name
Marking
Wire Name
S-
- Signal
E-
- Excitation
S+
+ Signal
E+
+ Excitation
NOTE: On dual RF A/D modules, each load cell terminal is marked 1-4, e.g. L/C3.
Load Cell Input Harness
Wire Color
Wire Name
Wire Color
Wire Name
White
- Signal
Black
- Excitation
Green
+ Signal
Red
+ Excitation
