Control Signals - Riello Solar R 11 Handbuch

The pump must be controlled by a low voltage, digital,
PWM (Pulse Width Modulation) signal. Pump speed
varies with the input signal as shown in the "PWM input
signal" figure.
The following is a description of the main characteristics
that the PWM signal generated by the controller must
have.
b
Make sure that the characteristics of your control-
ler's PWM signal conform to the following require-
ments. Signals with different characteristics can
cause irreparable damage to the pump's on-board
electronic circuits.
Low voltage, digital, PWM signal
The square wave PWM signal covers a frequency band
of 100 to 4,000 Hz. The PWM signal is used to control
pump speed.

CONTROL SIGNALS

Duty cycle
Example
T = 2 ms (500 Hz)
t = 0.6 ms
d % = 100 x 0.6 / 2 = 30 %
Example
U
iH
U
iL
T
d
UiH
UiL
IiH
14
Interpretation
UiH = 4-24 V
UiL ≤ 1 V
IiH ≤ 10 mA (depending
on UiH)
T
t
Period
Duty cycle (t/T)
Input signal high voltage level
Input signal low voltage level
Input signal current intensity