Cleaning and recalibration at the factory, Malfunctions, Malfunctions 9.3 – Burkert Type 8709 User Manual
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Maintenance, Troubleshooting
cleaning and recalibration at the factory
9.2.2.
If the orifice is excessively soiled or damaged, the device may deviate significantly from the flow-rate. It must then
be replaced and recalibrated at the factory.
noTe!
important information for the problem-free functioning of the device!
A recalibration should be carried out at the factory only, as very precise flow-rate standards and digital
communication are required.
Malfunctions
9.3.
problem
possible cause
remedial action
Power LED is not lit
No power supply.
Check the electrical connections.
Power LED flashes
The Autotune function is active.
See chapter
Power LED goes out
periodically
The power supply collapses periodically –
The device implements a reset.
Select power supply with adequate
power.
The losses in the connection cable are too
high.
Increase cable cross-section.
Reduce line length.
Limit (y) LED is lit
LFC: the actuating variable of the valve
has (almost) reached 100%. The set-
point value cannot be corrected.
Increase operating pressure
(observe maximum permitted supply
pressure).
Check line resistance and if required
reduce.
Check equipment design.
Check the filter installed in the line and if
required clean.
LFM: the actual flow-rate value has
(almost) reached or exceeded the
nominal flow-rate.
Reduce flow-rate.
Limit (y) LED flashes
The device is in an operating state other
than standard controlled operation or the
Autotune function.
See chapter
Error LED is lit
This is not a serious fault, e.g. the last
Autotune function was not concluded
successfully.
Repeat Autotune function or remove the
fault by performing a reset.
Error LED flashes
The residual ripple of the power supply
voltage is too high.
Use a power supply with a smooth output
voltage at the required power.
A serious fault has occurred, e.g. broken
sensor or fault in the internal power supply.
Return device to the manufacturer to
have the fault repaired.
The sensor was operated above the
permitted maximum operating pressure.
Reduce operating pressure.
Return device to the manufacturer to
have the fault repaired.
english
Type 8718, 8719 / 8708, 8709