Malfunction / Troubleshooting - Burkert 8626 Instructions De Service

MALFUNCTION / TROUBLESHOOTING

Problem Possible cause
"POWER" LED No electrical supply
does not light
"POWER" LED Autotune activated
flashes
"POWER" LED Voltage supply collapses
extinguishes periodically - device
periodically executes reset
Loss on the connecting line
too high
"LIMIT (y)" LED MFC: correcting variable of
lights (only with valve has reached almost
default 100 % - cannot correct to
configuration) setpoint.
MFM: process value has
almost reached nominal
flow rate.
"LIMIT (y)" LED Operating mode other than
flashes (only with standard control operation
default or Autotune.
configuration)
"ERROR" LED lights Less serious error has
occurred:
- Last Autotune was not
- A fault at an LED was
"ERROR" LED Residual ripple of supply
flashes volate too high.
Serious error, e. g. sensor
breakage or faulty internal
voltage supply.
No flow present Setpoint within zero-point
switch-off.
Different operating mode.
Table continued on the next page.
completed successfully.
detected.
Remedy
Check the electrical
connections.
see Section
Operating Modes
Select a power supply with
adequate power.
- Increase cable cross-section.
- Decrease cable length.
- Increase the supply
pressure.
- Check and if necessary
lower the piping resistance.
- Check system dimensioning
(see Section Proportional
Valve)
see Section
Operating Modes
- Repeat the Autotune or reset
the error.
- With errors at LED or binary
output, limited operation is
possible.
Select a suitable voltage
source (not industrial DC).
Send the device to the
manufacturer for repair.
Increase setpoint to > 2 % of
nominal flow.
Check the operating mode.
MFC/MFM - 45