Replacement Product Does Not Adopt All Of The Values From The Defective Product; Unstable Measured Value (Mfc With On/Off Valve); Outgassing Or Bubble Formation At The Product Outlet (Mfc With On/Off Valve); Dosing Quantity Cannot Be Reached - Burkert 8756 BATCH Operating Instructions Manual

Type 8756 BATCH
Troubleshooting
10.3.5 Replacement product does not adopt all of the values from
the defective product
Cause
The product description of the replacement product
is different from the product structure of the defect-
ive product. Only the existing values of the defective
product can be adopted by the replacement
product.
10.3.6

Unstable measured value (MFC with on/off valve)

Identify the cause to solve the problem:
Cause
You have not connected the functional earth (FE)
properly.
The residual ripple on the voltage supply is too high.
The product is caused to vibrate.
10.3.7 Outgassing or bubble formation at the product outlet (MFC
with on/off valve)
Identify the cause to solve the problem:
Cause
The pressurized liquid has a high gas sol-
ubility or outgassing occurs due to the
pressure drop across the on/off valve.
10.3.8

Dosing quantity cannot be reached

Identify the cause to solve the problem:
Cause
The inlet pressure is too low.
The on/off valve is not open long enough.
Solution
Use the Bürkert Communicator software to con-
figure the new values of the replacement
product.
Solution
To connect the functional earth, use a green-
and-yellow cable that is as short as possible.
And the cable cross-section must be at least
equal to the cross section of the power-supply
cable. Refer to chapter:
earth [} 27]
Use a supply voltage that conforms to the tech-
nical data given in chapter:
Run the Autotune function to adapt to the oper-
ating conditions. Refer to chapter: Optimise the
closed-loop control parameters (MFC)
Reduce the input pressure or contact the manu-
facturer.
Solution
If possible, reduce the liquid pressure.
Pressurize with a gas that has a lower solubility in the fluid.
Solution
Make sure that the pipe diameters and the pipe lengths are
adapted. Refer to Pressure loss, MFC with on/off valve
[} 19]
Increase the inlet pressure.
Increase the time during which the on/off is open.
Connect the functional
Electrical data [} 19]
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