KROHNE MFC 010 C Converter - Manual (Page 84)

82
MFC010 Interface Manual
Bit Error Flag Designation
4
CT
Name
: PCB Temperature
Cause
: The temperature detected on the main circuit board of the
MFC010 is exceeding the maximum limit specified for the
electronic components fitted to it.
Action :
This error may be due to a component malfunction on the main
MFC010 circuit board, incorrect wiring or excessive process
temperatures.
Check that the process temperature is within the specified limits
of the sensor being used. The temperature history, held in
Input register No. 1004 (see section 7.4 on page 43 for details),
will indicate the maximum process temperature that has been
measured.
Check that the system is correctly connected, excessive power
input to the MFC010 could lead to increased heat build up and
subsequent component failure.
If none of the other causes above can be attributed to be the
source of the error, call a service support engineer for further
guidance.
5
CT
Name
: Internal Voltage Levels
Cause
: The Voltage levels within the main measurement circuits are
outside of normal operating limits.
Action :
No field maintenance can be performed to rectify this problem, the
MFC010 should be replaced immediately. Call a service support
engineer.
6
CT
Name
: Temperature Sensor Short Circuit
Cause
: The measurement system has detected an electrical short circuit
between its temperature input terminals, therefore temperature
measurement is not possible. The system will default to a static
temperature reading of -200°C when this error occurs, however,
internally it will use the calibration reference temperature for
measurement calculation to prevent sudden massive variation in
the mass flow or density measurements.
Action :
Check for short circuits between the Temperature sensor
connections on the back plane circuit board and between the
temperature sensor connection and the sensor case. Call
a service support engineer for further advice.
7
CT
Name
: Temperature Sensor Open Circuit
Cause
: The measurement system has detected an electrical open circuit
between its temperature input terminals, therefore temperature
measurement is not possible. The system will default to a static
temperature reading of +500°C when this error occurs, however,
internally it will use the calibration reference temperature for
measurement calculation to prevent sudden massive variation in
the mass flow or density measurements.
Action :
Call a service support engineer
8
CT
Name
: MT Strain Gauge Short Circuit
Cause
: The measurement system has detected an electrical short circuit
between its measuring tube strain gauge input terminals,
therefore strain measurement is not possible. The system will
default to a static strain reading of 0Ω when this error occurs,
however, internally it will use the calibration reference strain for
measurement calculation to prevent sudden massive variation in
the mass flow or density measurements.
Action :
Call a service support engineer