Endress+Hauser Liquiline System CA80HA, Руководство по эксплуатации

Страница: 111 / 214

Liquiline System CA80HA Operation
Hauser 111
1. PWM (pulse width modulation):
The duty cycle is varied within a period T (T=t
1
+t
0
). The cycle duration remains constant.
0 T
t
1
t
0
2T 3T
y = t / T
1
10 % 50 % 100 %
1 "High"
0 "Low"
t
 62 Typical application: solenoid valve
2. PFM (pulse frequency modulation):
Here, pulses of a constant length (t
1
) are output and the interval between the pulses varies
(t
0
). At a maximum frequency, t
1
= t
0
.
1 "High"
0 "Low"
T
t
t
1
t
0
2T
y = f / f = T / T
max min
100 % 50 %
20 %
3T
 63 Typical application: dosing pump