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Operating Instructions
BA 7020
Technical specifications subject to change without notice
Copyright according to ISO 16016
1
Desired
characteristic
equal percentage
quadratic
linear
equal percentage
linear
DIP switch 10
Valve
characteristic
Actuator
characteristic
Result at valve
= Werkseinstellung
Hub
Hub
Hub
Hub
Hub
Signal
Signal
Signal
Signal
Signal
Signal
Signal
Signal
Signal
Signal
Hub
Hub
Hub
Hub
lin
a
lin
x
2
Hub
1
0
10
0
10
1
0
10
Actuator
characteristic can
only be selected in
Modbus mode.
Actuator characteristic
can only be selected
in Modbus mode.
Fig. 9: Valve characteristics
6.4 Initialisation run
Baelz 7020 positioners which are delivered ready-fitted with actuator, valve and yoke are initialized by the
manufacturer and are ready for operation. 2 seconds after switching the unit on, only the green LED is lit.
The actuator must be fitted to a valve before operation!
Attention
If the unit is not initialized, the green LED flashes. The red LED is lit when the position of the potentiometer is not
ideal for an initialisation run. (See FigFig. 11 page 17 for meaning of LED signals.) An initialisation run can still
be carried out, but it will take approx. 1x valve travel time longer. During a successful initialisation run, the valve is
moved to both of its end positions. The potentiometer and the position of the valve are synchronized and values for
valve travel time and switching hysteresis are determined.
Switch DIP switch 12 from 0 to 1 to start an initialisation run. The red LED is lit during initialisation.
When initialisation has been successfully completed, only the green LED is lit. For error signals see table
"Initialisation error codes", Fig. 1Fig. 14 page 20.
As long as DIP switch 12 is set to 1, errors and alarms occurring during normal positioner operation will not be
shown. This enables errors occurring during initialisation to be distinguished from errors during normal positioner
operation.
Switch DIP 12 back to 0 after the initialisation run to show any errors occurring in normal positioner operation on
the red LED.
(After the first initialisation run (unit not previously initialized), the unit moves to the 50% position upon completion of initialisation.
As soon as DIP 12 is set to 0, the Baelz 7020 follows the set value signal at analogue input 2.)
