Burkert 1094 Instructions De Service page 6

• integrated current regulation for compensation of the coil heating
• continuous variation of the opening of the valve, and thereby the fluidic output
dimension (e.g., flow), is possible by changing the effective coil current (via the
switching relationship of the output PWM signal);
the current values at which the valve starts to open (I
opened (I ) depend on the pressure relationships in the actual application
2
• by means of the two potentiometers R
values of the coil current can be optimally adjusted to the pressures in the respective
applications (see 4.3):
- zero-point potentiometer R
value of the control signal, and thereby the start of valve opening
- amplification potentiometer R
and thereby the maximum current I
signal, e.g., 10V) (see Diagram 1)
• the zero-point switch-off guarantees that the valve will close completely with an input
signal < 2% of the maximum value; the coil current will thereby be electronically set to
zero for input signals below this threshold (e-g., 0.2 V for standard signal input 0 ..
10V) (Diagram 1);
this zero-point switch-off can be de-activated via a DIP switch, e.g., for the simplest
settings of the start of opening of the valve using potentiometer R
4 - 1094
and R (see connection diagram), these key
1 2
for the adjustment of the coil current I
1
for setting the gradient of the I(U) characteristic
2
or the attainable flow (for maximum standard
2
) or at which it is just fully
1
for the lower
1
1
Diagram 1: I (U)
characteristic