Burkert Type 8715 - Manual (Page 43)

43
Maintenance,Troubleshooting
Type 8710, 8711, 8713, 8715
43
problem possible cause recommended action
The measured value
fluctuates The earth connection (FE) is not correct. Connect the FE to the earthing point (cable as short as
possible, wire at least 2.5 mm²).
The controller must continuously correct fluctuations in
an unstable pressure supply, e.g. by pumping. Connect a suitable pressure controller upstream.
Install a buffer tank to absorb pressure fluctuations.
The residual ripple of the supply voltage is too high. Use a power supply with a smooth output voltage at
the required power.
Set-point value at 0%,
but the fluid is circulating The operating pressure is above the operating pressure
maintained by the proportional valve. Reduce the operating pressure.
Return the device to the manufacturer to have the fault
repaired.
Set-point value = 0%,
valve is closed, no
flow-rate in the line;
but the measured
flow-rate is not zero The mounting position of the device is incorrect. Install the MFC in the mounting position shown in the
calibration protocol or the calibration plate and run an
Autotune function to adjust to the operating conditions.
A fluid other than that designated by the calibration is
used. Return device to the manufacturer for recalibration for
the operating fluid.
Set-point value is not
reached The filter is blocked. Clean or replace the filter.
The primary pressure is too low. Increase primary pressure to calibration pressure.
The back pressure is too high. Check components for soiling downstream of the
device and if required clean.
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