Troubleshooting Promag 53 PROFIBUS DP/PA
144 Endress+Hauser
9.4 Process errors without messages
Symptoms Rectification
!
Note!
You may have to change or correct certain settings of the function matrix in order to rectify faults. The functions outlined below, such as DISPLAY
DAMPING, for example, are described in detail in the "Description of Device Functions" manual.
Flow values are negative, even
though the fluid is flowing forwards
through the pipe.
1. Remote version:
– Switch off the power supply and check the wiring → 50
– If necessary, reverse the connections at terminals 41 and 42
2. Change the setting in the INSTALLATION DIRECTION SENSOR function accordingly
Measured value reading fluctuates
even though flow is steady.
1. Check grounding and potential matching. → 62
2. The medium is too inhomogeneous. Check the following medium characteristics:
– Gas bubble percentage too high?
– Solids percentage too high?
– Conductivity fluctuations too high?
3. SYSTEM DAMPING function increase value ( BASIC FUNCTION/SYSTEMPARAMETER/
CONFIGURATION)
4. TIME CONSTANT function increase the value ( OUTPUTS/CURRENT OUTPUT/CONFIGURATION)
5. DISPLAY DAMPING function increase the value ( USER INTERFACE/CONTROL/BASIC
CONFIGURATION)
Measured-value reading or
measured-value output pulsates or
fluctuates, e.g. because of
reciprocating pump, peristaltic
pump, diaphragm pump or pump
with similar delivery characteristic.
Perform the "Pulsating Flow" Quick Setup (only possible if a pulse/frequency output is available
). → 87
If the problem persists despite these measures, a pulsation damper will have to be installed between pump and
measuring device.
There are differences between the
flowmeter's internal totalizer and
the external metering device.
This symptom is due primarily to backflow in the piping because the pulse output cannot subtract in the
STANDARD or SYMMETRY measuring modes.
The problem can be solved as follows:
Allow for flow in both directions. Set the MEASURING MODE function to PULSATING FLOW for the pulse output
in question.
Measured value reading shown on
display, even though the fluid is at a
standstill and the measuring tube is
full.
1. Check grounding and potential matching → 62
2. Check the fluid for presence of gas bubbles.
3. Activate the ON-VALUE LOW FLOW CUT OFF function, i.e. enter or increase the value for the low flow cut
off ( BASIC FUNCTIONS / PROCESS PARAMETERS / CONFIGURATION).
Measured-value reading on display,
even though measuring tube is
empty.
1. Perform empty-pipe/full-pipe adjustment and then switch on Empty Pipe Detection → 125
2. Remote version:
Check the terminals of the EPD cable → 50
3. Fill the measuring tube.
The current output signal is
always 4 mA, irrespective of the flow
signal at any given time.
Value for creepage too high:
Reduce the corresponding value in the ON-VALUE LOW FLOW CUT OFF function.
The fault cannot be rectified or some
other fault not described above has
occurred.
In these instances, please contact
your Endress+Hauser service
organization.
The following options are available for tackling problems of this nature:
• Request the services of an Endress+Hauser service technician
If you contact our service organization to have a service technician sent out, please be ready to quote the
following information:
– Brief description of the fault
– Nameplate specifications: order code, serial number → 6
• Returning devices to Endress+Hauser
The required procedures must be carried out before you return a flowmeter requiring repair or calibration to
Endress+Hauser. → 155
Always enclose a duly completed "Declaration of contamination" form with the flowmeter. You will find a
preprinted form at the back of this Operating Manual.
• Replace transmitter electronics
Components in the measuring electronics defective order spare parts → 146
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