Promag 53 PROFIBUS-DP/-PA 9 Trouble-shooting
Endress+Hauser 121
9.3 Process errors without messages
Symptoms Rectification
Remark:
You may have to change or correct certain settings in parameters in order to rectify the fault.
The following parameters are described in detail in the “Description of Device Functions” manual.
Flow values are negative,
even though the fluid is flow-
ing forwards through the
pipe.
1. In case of remote version:
Switch off power supply and check wiring
→ Page 50 ff.
2. Alter setting in INSTALLATION DIR. SENSOR function accordingly
Measured value reading
fluctuates even though flow
is steady.
1. Check grounding and potential equalisation
→ Page 58 ff.
2. The fluid is not homogenous. Check the following fluid properties:
– Proportion of gas bubbles – too high?
– Proportion of solids – too high?
– Conductivity fluctuations – too high?
Measured value reading or
measuring value output pul-
sates or fluctuates, e.g.
because of reciprocating
pump, peristaltic pump, dia-
phragm pump or pump with
similar delivery characteris-
tic.
Increase the system damping value:
• PROFIBUS (Commuwin II):
– Manufacturer-specific transducer block
→ Device matrix →
SYSTEM DAMPING (V8H1)
– Analog Input function block
→ RISING TIME (V1H8)
• Local display:
BASIC FUNCTIONS
→ SYSTEM PARAMETERS → CONFIGURATION
→ SYSTEM DAMPING
Will a slight flow be dis-
played even though the fluid
is at a standstill and the
measuring tube is full?
1. Check grounding and potential equalisation
→ Page 58 ff.
2. Check the fluid for presence of gas bubbles.
3. Enter a value for the low flow cutoff or increase this value:
– PROFIBUS (Commuwin II): manufacturer-specific transducer block
→ Device matrix → ON VALUE LOW FLOW CUTOFF (V3H2)
– Local display: BASIC FUNCTIONS
→ PROCESS PARAMETERS →
CONFIGURATION
→ ON VALUE LOW FLOW CUTOFF
Will a measured value be
displayed even though
measuring tube is empty?
1. Perform empty-pipe/full-pipe calibration and then switch on Empty
Pipe Detection
→ Page 106
2. Fill the measuring tube.
The fault cannot be rectified
or some other fault not
described above has
occurred.
In these instances, please
contact your E+H service
organisation.
The following options are available for tackling problems of this nature:
Request the services of an E+H service technician
If you contact our service organisation to have a service technician sent
out, please be ready with the following information:
– Brief description of the fault
– Nameplate specifications (Page 7 ff.): Order code and serial number
Returning devices to E+H
The procedures on Page 6 must be carried out before you return a flow-
meter requiring repair or calibration to Endress+Hauser.
Always enclose a duly completed “Safety regulation” form with the
device. You will find a preprinted “Safety regulation” form at the back of
this manual.
Replace transmitter electronics
Components in the measuring electronics defective
→
order replacement
→ Page 122
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