Grundfos ALPHA1 L, Инструкция по установке и эксплуатации

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6.3.2 PWM input signal profile A (heating)
The pump runs on constant-speed curves depending on the PWM
input signal. The speed decreases when the PWM value increases.
If the PWM signal equals zero (0 VDC), the pump will switch to the
control mode selected before connecting to a PWM signal.
A
C
B
TM069136
PWM input signal profile A (heating)
Pos. Description
A Max.
B PWM input signal
C Speed
PWM input signal [%] Pump status
≤ 10 Maximum speed: max.
> 10 / ≤ 84 Variable speed: min. to max.
> 84 / ≤ 91 Minimum speed: IN
> 91/95 Hysteresis area: on/off
> 95 or ≤ 100 Standby mode: off
6.3.3 PWM feedback signal
The PWM feedback signal offers pump information like in bus
systems:
•
current power consumption (accuracy ± 2 % of PWM signal)
• warning
• alarm.
Alarms
Alarm output signals are available because some PWM output
signals are dedicated to alarm information. If a supply voltage is
measured below the specified supply voltage range, the output
signal is set to 75 %. If the rotor is locked due to deposits in the
hydraulics, the output signal is set to 90 % because this alarm has a
higher priority. See fig. PWM feedback signal - power consumption.
25 50 100 150 200 250
1
10
20
30
40
50
60
70
80
90
100
2
3
4
5
6
7
TM071313
PWM feedback signal - power consumption
Pos. Description
1 Power [W]
2 Standby (stop)
3 Alarm stop: fault, blocked pump
4 Alarm stop: electrical fault
5 Warning
6 Saturation at 70 Watt
7 Slope: 1 W / % PWM
Data
Maximum rating Symbol Value
PWM frequency input with high-speed
optocoupler
f 100-4000 Hz
Guaranteed standby power consumption < 1 W
Rated input voltage - high level
U
iH
4-24 V
Rated input voltage - low level
U
iL
< 1 V
High-level input current I
iH
< 10 mA
Input duty cycle PWM 0-100 %
PWM frequency output, open collector f 75 Hz ± 5 %
Accuracy of output signal regarding
power consumption
-
± 2 % (of
PWM signal)
Output duty cycle PWM 0-100 %
Collector emitter breakdown voltage on
output transistor
U
c
< 70 V
Collector current on output transistor
I
c
< 50 mA
Maximum power dissipation on output
resistor
P
R
125 mW
Zener diode working voltage
U
z
36 V
Maximum power dissipation in Zener di-
ode
P
z
300 mW
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