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136 Micro Motion
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Model 2400S Transmitters for PROFIBUS-DP
Troubleshooting
11.19 Restoring a working configuration
At times it may be easier to start from a known working configuration than to troubleshoot the
existing configuration. To do this, you can:
• Restore a configuration file saved via ProLink II, if one is available. See Figure C-1.
• Restore the factory configuration. To do this:
- Using ProLink II, see Figure C-2. ProLink II v2.6 or higher is required.
- Using a PROFIBUS host and the EDD, see Figure C-10.
- Using PROFIBUS bus parameters, use the Diagnostic Block, Index 51 (see Table D-4).
Both of these actions will overwrite the existing configuration. Ensure that the existing configuration
is appropriately documented or saved.
11.20 Checking the test points
Some status alarms that indicate a sensor failure or overrange condition can be caused by problems
other than a failed sensor. 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. These values describe the current operation of the sensor.
11.20.1 Obtaining the test points
To obtain the test point values:
• With the display, configure the required test points as display variables. See Section 8.9.3.
• With ProLink II:
a. Click
ProLink > Diagnostic Information.
b. Observe or record the values displayed for
Tube Frequency, Left Pickoff, Right Pickoff,
and
Drive Gain.
• With a PROFIBUS host with the EDD, use the Meter Diagnostics window in the Device menu
(see Figure C-7).
• With PROFIBUS bus parameters, read Indices 32, 33, 35, and 36 in the Diagnostic block (see
Table D-4).
11.20.2 Evaluating the test points
Use the following guidelines to evaluate the test points:
• If the drive gain is erratic, negative, or saturated, refer to Section 11.20.3.
• If the value for the left or right pickoff does not equal the appropriate value from Table 11-4,
based on the sensor flow tube frequency, refer to Section 11.20.4.
• If the values for the left and right pickoffs equal the appropriate values from Table 11-4, based
on the sensor flow tube frequency, record your troubleshooting data and contact the Micro
Motion customer service department.