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104 Model 2700 Transmitter with PROFIBUS-PA
Troubleshooting
6.12 Checking the test points
You can diagnose sensor failure or overrange status alarms by checking the flowmeter test points. The
test points include left and right pickoff voltages, drive gain, and tube frequency.
6.12.1 Obtaining the test points
You can obtain the test points with the PROFIBUS EDD, PROFIBUS bus parameters, or ProLink II.
With PROFIBUS EDD
To obtain the test points, select
View > Diagnostics > Meter Diagnostics. Record the LPO
Amplitude, RPO Amplitude, Drive Gain, and Tube Frequency values.
With PROFIBUS bus parameters
To obtain the test points, examine the indices listed in Table 6-5.
With ProLink II
To obtain the test points, select
ProLink > Diagnostic Information. Record the Left Pickoff, Right
Pickoff, Drive Gain, and Tube Frequency values.
6.12.2 Evaluating the test points
Use the following guidelines to evaluate the test points:
• If the drive gain is at 100%, refer to Section 6.12.3.
• If the drive gain is unstable, refer to Section 6.12.4.
• If the value for the left or right pickoff does not equal the appropriate value from Table 6-6,
based on the sensor flow tube frequency, refer to Section 6.12.5.
• If the values for the left and right pickoffs equal the appropriate values from Table 6-6, based
on the sensor flow tube frequency, contact the Micro Motion Customer Service Department for
assistance.
Table 6-5 Bus parameter test points
Slot Index Description
11 160 Drive gain
11 161 Tube frequency
11 163 LPO amplitude
11 164 RPO amplitude
Table 6-6 Sensor pickoff values
Sensor model
(1)
Pickoff value
ELITE Model CMF sensors 3.4 mV peak to peak per Hz based on flow tube frequency
Model CMF400 I.S. 2.7 mV peak to peak per Hz based on flow tube frequency
Model CMF400 with booster amplifier 3.4 mV peak to peak per Hz based on flow tube frequency
Model D, DL, and DT sensors 3.4 mV peak to peak per Hz based on flow tube frequency
Model F025, F050, and F100 sensors 3.4 mV peak to peak per Hz based on flow tube frequency