Heating Characteristic (Mode 1) - WITA Delta Maxi 80 Série Traduction Des Instructions De Service D'origine

Operating instrutions
8.1

Heating characteristic (mode 1)

When the PWM signal is switched off, the pump runs at maximum speed. This ensures that the
system can function in an emergency, even if the controller is defective or the connection cable
is broken. As the PWM signal rises, the speed of the pump falls. The following characteristic
shows how the pump reacts to the various PWM signal levels. To prevent the system from
cycling, the characteristic has a hysteresis in zone D.
A = Maximum speed
B = Variable speed MIN – MAX
C = Minimum speed
D = Hysteresis ON – OFF
E = Stand-by mode OFF
Pump outputs with different PWM signals:
Characteristic WITA Delta MAXI 80 PWM Mode 1
H
(m)
7
< 10% PWM (MAX Characteristic)
6
20% PWM
5
4
40% PWM
3
60% PWM
2
1
80% PWM
90% PWM (MIN Characteristic)
0
0 1
100% PWM
32
WITA Delta Maxi 80-XX
MAX
speed
MIN
2 3 4
Pump is switched off
LED 1 flashes
0 10 20 30 40 50
A B
5 6
60 70 80 90 100 PWM (%)
C D E
3
7 8 Qm /h