Speed Sensor Cables; Testing Speed Sensor Extension Cables - Raven SCS660M Installation & Service Manual

Chapter 7
Repeat the ground-signal short test.
b.
•
If the TOTAL VOLUME increases, replace the defective cable and repeat the ground-signal short
test.
•
If the TOTAL VOLUME does not increase, replace the flow sensor.
Perform voltage checks as illustrated in the figure above.
6.
Important:
Re-enter the original METER CAL and SPREADER CONSTANT figures after testing is
complete.

Speed Sensor Cables

Testing Speed Sensor Extension Cables

Note:
Verify that the console is in the SP1 Speed Sensor mode while testing the cable.
Disconnect the extension cable from the speed sensor assembly cable.
1.
Speed Sensor Connector Cable Connection
FIGURE 2.
Ground
Note:
If a +5 VDC voltage reading is not present, disconnect the flow sensor cable. If the speed reading
is restored, refer to the Testing Flow Meter/Encoder Cables section on page 43 to test the flow
meter cables.
If the speed system is a radar-type system, the voltage between the 10 o'clock and 2 o'clock
positions may read +12 VDC.
Enter a SPEED CAL value of 9999 into the console.
1.
Press the DISTANCE button.
2.
Create a short between the ground and signal sockets by inserting a small jumper wire or paper clip into
3.
both sockets simultaneously. Each time contact is made, the DISTANCE reading should increase in
increments of 1 or more. If the DISTANCE does not increase:
Remove the section of cable closest to the console.
a.
Repeat the ground-signal short test.
b.
•
If the DISTANCE increases, replace the defective cable and repeat the ground-signal short test.
•
If the DISTANCE does not increase, replace the speed sensor.
Perform voltage checks as illustrated in the figure above.
4.
Important:
Re-enter the original SPEED CAL figure after testing is complete.
44 SCS 660 & 660M Serial Interface for Granular Applications Installation & Service Manual
+5 VDC
+5 VDC
Power
Signal