7 Trouble-shooting
The Prowirl 77 measuring system operates without the need for maintenance.
However, if a fault should occur or incorrect measurements are suspected, then the
following instructions will be of help in identifying the cause of and remedying any
possible errors.
Warning!
• All local regulations and all safety instructions in this operating manual are to be
strictly observed when making electrical connections.
• All data and regulations on Ex instruments in the separate Ex documentation are to
be strictly observed.
Errors and faults identified by the continuous self-monitoring system can be called up
by the control system using the PROFBUS-PA interface.
The Prowirl 77 measuring system distinguishes between two kinds of errors:
System error:
This error directly affects flow measurement → remedy the error immediately.
• In the cyclic data telegram the status is set to “BAD”.
• The red LED lights up permanently.
• The totalizer remains at the last registered value.
• In function “Diagnostic code” an error code is displayed.
Warnings:
These errors do not affect flow measurement directly → The measurement system
continues to measure.
• In the cyclic data telegram the totalizer status can be “UNCERTAIN”.
• The red LED flashes.
Note:
When more than one error is present, the one with the highest priority is displayed.
Warning!
System errors
Code Cause Remedy
101 Defective sensor Check and, if necessary, replace the sensor
through E+H Service
102 EEPROM error (checksum error) Contact E+H Service
103 Communication error with sensor Self-monitoring system starts a remedying try,
otherwise contact E+H Service
104 Error in ASIC Contact E+H Service
106 Download active
i.e. configuration data are being digitally
transmitted to the Prowirl 77 system
The sensor will operate normally again once
download is finished
116 An error has occurred during the
download of configuration data
Reload the configuration data
Warnings
Code Cause Remedy
211 Correct value of totalizer is not guaranteed
(check sum error)
Reset totalizer (see “function discription” on
page 33)
250 Initializing active Wait until initializing is finished
Note!
Prowirl 77 PROFIBUS-PA 7 Trouble-shooting
Endress+Hauser 45
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