Burkert 8626 - Malfunction; Troubleshooting

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