“Solar” function
36
Controlling HE pumps with PWM signals
In the case of the pump control system with PWM signal, the controller sends a PWM
signal (pulse width modulation signal) to terminals HE1, HE2 and HE3. The PWM signal can
be sent normally (not inverted) or inverted.
In the case of the pump control system with a non-inverted PWM signal, the nominal
speed of the pump (0–100 %) corresponds to the PWM signal (0–100 %). The following
diagram shows the power curve for the pump control system with a non-inverted PWM
signal.
n (%) – nominal speed of the pump
PWM (%) – non-inverted PWM signal
In the case of the pump control system with an inverted PWM signal, the nominal speed
of the pump (0–100 %) corresponds to the PWM signal (100-0 %). The following diagram
shows the power curve for the pump control system with an inverted PWM signal at a
minimum pump output of 30 %.
PWM (%) – inverted PWM signal
n (%) – pump speed sent by the controller
