Burkert Type 8712 - Manual (Page 38)

38
Operationandfunction
Type 8006, 8702
8.3.2. Autotune function
The Autotune function is run through during the final
inspection in the factory, at the operating pressure and with
the calibration fluid indicated in the calibration protocol.
Therefore, the re-actuation of this function is not essential.
However, the
Autotune function should be activated if:
• the pressure conditions in the system have changed
significantly,
• the calibration fluid does not correspond to the
operating fluid.
In this operating mode, the device calculates and optimizes the control
settings to the conditions present in the system.
The solenoid control valve is activated according to a predefined profile
resulting in flow-rate changes. Thereby several control settings are
adjusted to the conditions on-site. These settings are stored in the
non-volatile memory of the device at the end of a successful
Autotune.
This function of the MFC is obtained by activating a binary input
(configured on this function) for at least 0.5 s. The Power LED (green)
flashes to signal that the function is in progress.
Warning
Various flow-rate changes occur when the Autotune is active.
• Do not switch off the power supply to the MFC.
• Keep the supply pressure constant.
→
Before activating the Autotune function, bring the medium
pressure to a pressure close to the calibration pressure.
While the Autotune function is running, the MFC is not in control mode.
When the Autotune function ends, the MFC returns to the operating
mode it was in prior to activation.
8.3.3. safety function
In this operating mode, the device behaves as in control mode, except
that the set-point value is ignored and replaced by a predefined safety
set-point value. The default safety set-point value is 0%. This can be
modified with the "Mass Flow Communicator" software.
This function of the MFC is obtained by activating a binary input or via
the field bus, depending on the configuration of the device. The Limit
LED (blue) flashes to signal that the function is in progress.
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