Burkert Type 8625 - Manual (Page 36)

34 - 8625-2 Standard
english
Î On using a direct acting proportional valve (Types 6022, 6023, 6024, 2832,
2834), set the greatest operating temperature expected in the application
(the start of opening is lowered with increasing admission temperature).
With a pilot controlled proportional valve (Type 6223), on the other hand, set
the lowest admission temperature to be expected in operation (in this case,
the start of opening is raised with increasing admission temperature).
Î Select the menu item VALV in the configuration mode. The actual value is
displayed.
Î If at the controller output obtaining no recognizable flow is present, first
increase the pulse-duty factor by pressing the key until flow is detected.
Î Now lower the pulse-duty factor by pressing the key until the valve is
just closed, i.e. now flow is present.
Î Press the key: the value for start of opening will be stored.
To determine the start of opening of the proportional valve in the current
application, the following steps are executed (on first operation of the device. This
is done immediately after switching on, while the coil is still cold):