Raven AccuFlow Vortex, Installation And Operation Manual

Page: 81 / 98

Troubleshooting: Flow Meter Extension Cable 77
TROUBLESHOOTING
7
FIGURE 2. Speed Sensor Extension Cable Connector Pins
NOTE: If a radar type speed sensor is used, the voltage between the 10 o’clock and 2 o’clock positions may
read 12 VDC.
If a +5V DC voltage reading is not present, disconnect the flow meter cable and re-test the speed
sensor cable. If the voltage reads +5V DC when the flow meter cable is disconnected, test the flow
meter cable as described in the Testing the Flow Meter Cable section on page 78.
TESTING THE SPEED SENSOR EXTENSION CABLE
1. Enter a speed cal of 9999.
2. Zero the odometer by entering a zero value in the distance button.
3. With a small jumper wire (or paper clip), short between the 10 o’clock and 6 o’clock sockets with a ‘short-no-
short’ motion. Each time contact is made, the distance total should increase by increments of 1 or more.
4. If the distance total does not increase, remove the section of cable and repeat the test at the connector that is
the next closest to the node. If the distance total now increases with the short-no-short test, replace the
defective cable as required.
5. If no pulses are registered, perform the above voltage checks.
6. If all of the cables test ‘good’, replace the Speed Sensor.
NOTE: After testing is complete, re-enter the correct speed cal before starting an application.
FLOW METER EXTENSION CABLE
Before starting this test, disconnect the flow meter cable from the flow meter. Hold the flow meter cable so that
the keyway is pointing in the 12 o’clock position as shown below.
FIGURE 3. Flow Meter Extension Cable Connector Pins
NOTE: If a +5 VDC voltage reading is not present, disconnect the speed sensor cable. If the voltage reading
is restored, test the speed sensor cable as described in the Testing the Speed Sensor Extension Cable
section on page 77.
10 o’clock
Ground
2 o’clock
Power
Keyway
6 o’clock
Signal
5 VDC
5 VDC
10 o’clock
Power
2 o’clock
Ground
Keyway
6 o’clock
Signal
5 VDC
5 VDC