The activation of solenoid control is indicated by LED ”H3“,the brightness of which is proportional to the solenoid current.The following values can be adjusted from outside by meansof assigned trimming potentiometers:– Ramp time, separately for up and down ramp(by means of R11, R12 → t max approx. 5 s)– Gradient of the output characteristic curve(by means of R1, R2)