Micro Motion RFT9709 Instrukcja Obsługi Strona 74

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60
Using ProLink
®
Software with Micro Motion
®
Transmitters
View Menu: Status
continued
Critical indicators
Table 7-4. Nominal resistance and voltage ranges for flowmeter circuits
Notes
Temperature sensor value increases 0.38675 ohms per
°
C increase in temperature.
Nominal resistance values will vary 40% per 100
°
C. However, confirming an open coil or shorted coil is more important
than any slight deviation from the resistance values presented below.
Resistance across terminals 6 and 8 (right pickoff) should be within 10% of resistance across terminals 5 and 9 (left
pickoff).
Resistance values depend on the sensor model and date of manufacture.
Table 7-5. Troubleshooting faulty sensor cable
Circuit Wire colors Sensor terminals Normal resistance range Normal voltage
Drive coil Brown to red 1 to 2 8 to 2650 ~8.0 V
Left pickoff Green to white 5 to 9 15.9 to 300 3.4 mV/Hz
Right pickoff Blue to gray 6 to 8 15.9 to 300 3.4 mV/Hz
Temperature sensor Orange to violet 4 to 7 100
at 0
°
C + 0.38675
/
°
C not applicable
Lead length compensator Yellow to violet 4 to 7 100
at 0
°
C + 0.38675
/
°
C not applicable
Status indicators Resistance at transmitter terminals Cause Corrective action(s)
Sensor Failure
Input Overrange
Open or short from green to white
Open or short from blue to gray
Faulty cable Repair or replace sensor
cable
Sensor Failure
Drive Overrange
Open or short from red to brown
Sensor Failure
Temperature Overrange
Open or short from violet to yellow
Open or short from violet to orange
Sensor Failure
Input Overrange
Temperature Overrange
Drive Overrange
Resistance of any wire pair is outside
range listed in
Table 7-4
Incorrect or faulty cable
connection
Sensor failure
Reconnect sensor cable
according to installation
instructions
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