40
Setting and operation
Type 8746 Profibus, 8746 Analogue
10
seTTing And OPerATiOn
10.1
Safety instructions
DANGER
risk of injury that is due to pressure in the installation or in
the product.
▶
Before working on the installation or product, cut the pres
-
sure. Vent and drain the pipes.
risk of injury from electric shocks.
▶
Before working on the installation or product, switch off the
power supply. Make sure that nobody can switch the power
supply on.
▶
Observe all applicable accident protection and all applicable
safety regulations for electrical equipment.
Burn hazard and fire hazard that are due to hot surface of the
product.
▶
Do not touch the hot surface with bare hands.
▶
Wear safety gloves to touch the product.
▶
Keep the product away from any highly flammable materials
or fluids.
Risk of injury that is due to escape of the fluid.
▶
Observe all applicable accident protection and all applicable
safety regulations relating to the operating fluid used.
WARNING
risk of injury that is due to improper operation.
Improper operation can lead to injuries and damage to the
product and its environment.
▶
The operating personnel must have read and understood the
content of the Operating Instructions.
▶
Observe the safety information and the intended use.
▶
Only properly trained personnel may operate the installation
and the product.
▶
Only properly trained personnel may do the settings with the
help of the Bürkert Communicator software.
10.2 functions
10.2.1 Zero-point shut-off (Mfc)
A zero-point shut-off ensures the sealing function of the control
valve. The zero-point shut-off is activated if the following conditions
occur simultaneously:
1.
Set-point value < 2 % of nominal flow rate Q
nominal
(with
measuring range 1:50)
2.
Measured value < 2 % of nominal flow rate Q
nominal
(with
measuring range 1:50)
If the zero-point shut-off is active, then the PWM signal is set
to 0% so that the control valve is completely closed.
English
Summary of Contents for 8746
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