Cleaning And Recalibration At The Factory; Malfunctions - Burkert 8718 Manuel D'utilisation

Type 8718, 8719 / 8708, 8709
Maintenance, Troubleshooting
9.2.2. cleaning and recalibration at the factory
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.
9.3.

Malfunctions

problem
Power LED is not lit
Power LED flashes
Power LED goes out
periodically
Limit (y) LED is lit
Limit (y) LED flashes
Error LED is lit
Error LED flashes
possible cause
No power supply.
The Autotune function is active.
The power supply collapses periodically –
The device implements a reset.
The losses in the connection cable are too
high.
LFC: the actuating variable of the valve
has (almost) reached 100%. The set-
point value cannot be corrected.
LFM: the actual flow-rate value has
(almost) reached or exceeded the
nominal flow-rate.
The device is in an operating state other
than standard controlled operation or the
Autotune function.
This is not a serious fault, e.g. the last
Autotune function was not concluded
successfully.
The residual ripple of the power supply
voltage is too high.
A serious fault has occurred, e.g. broken
sensor or fault in the internal power supply.
The sensor was operated above the
permitted maximum operating pressure.
remedial action
Check the electrical connections.
See chapter 8.3. Functions of the LFC /
LFM.
Select power supply with adequate
power.
Increase cable cross-section.
Reduce line length.
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.
Reduce flow-rate.
See chapter 8.3. Functions of the LFC /
LFM.
Repeat Autotune function or remove the
fault by performing a reset.
Use a power supply with a smooth output
voltage at the required power.
Return device to the manufacturer to
have the fault repaired.
Reduce operating pressure.
Return device to the manufacturer to
have the fault repaired.
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