Cleaning And Recalibration At The Factory; Malfunctions - Burkert 8718 Operating Instructions Manual

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
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 oper-
ation or the Autotune function.
This is not a serious fault, e.g. the last
Autotune function was not concluded
successfully.
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.
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