Endress+Hauser prowirl 77, Руководство по эксплуатации

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The Prowirl 77 measuring system is fitted with two LEDs to indicate its operating
status. They can be seen after removing the housing cover.
The green LED does light up permanently when the device is powered by the field
bus. Flashing of the green LED means communication between device and control
system by cyclic data exchange. The red LED should not light up at faultless ope-
ration.
Green LED does not light up
•
Has the wiring been done according to wiring diagram on page 15?
Red LED lights up permanently
•
A system error has occurred. Description see page 45.
Red LED flashes
•
A warning is displayed. Description see page 45.
No flow signal
•
For liquids: Is the pipeline completely filled? The pipeline must always be
completely filled to ensure accurate and reliable flow measurement.
•
Has all packing material and protective disks been removed from the meter body?
•
Have the right configuration files been copied?
Flow signal under no-flow conditions
Is the flowmeter subject to vibrations greater than 1g?
In such cases flow may be indicated under no-flow conditions due to the frequency
and direction of oscillations.
Remedial procedure on flowmeter:
– Turn the sensor through 90°. The measuring system is most responsive to
vibration in the direction of sensor displacement. The vibration has less effect on the
measuring system in other axes.
– The amplification can be reduced using the function “Select gain range”
(see page 43).
Remedial procedure with mechanical layout of the installation:
– If the source of the vibration (e.g. pump or valve) can be identified, then decoupling
or supporting the source can reduce vibration.
– Supporting the pipeline near the flowmeter.
7 Trouble-shooting Prowirl 77 PROFIBUS-PA
46 Hauser