Grundfos Medium UPM Series Data Booklet page 12

5
PWM feedback signal - flow estimation (on request)
On request, there is an option where the PWM
feedback signal can also be used to indicate the flow
of the pump on defined pump housings (e.g. cast iron
inline) above a head of 1 m. The accuracy of the
feedback signal is depending on the media, media
temperature and operation point, but it gives an
indication on the actual flow.
Example: The PWM output range between 0-70 %
shows the flow between 0 and 4 m
3
0.057 m /h / % PWM.
100
Standby (stop)
Alarm stop: Fault, blocked pump
90
Alarm stop: Electrical fault
Warning: Electronics high temp.
80
Warning
70
60
50
40
30
20
10
0 1.0
Fig. 9 PWM feedback signal - flow estimation
Data
Maximum rating
PWM frequency input with high-speed
optocoupler
Guaranteed standby power consumption
Rated input voltage - high level
Rated input voltage - low level
High-level input current
Input duty cycle
PWM frequency output, open collector
Accuracy of output signal regarding power
consumption
Note: A PWM output signal below 5 % is too
inaccurate for the calculation of the flow.
Accuracy of output signal regarding flow:
3
< 1 m /h
3
> 1 m /h
Output duty cycle
Collector emitter breakdown voltage on
output transistor
Collector current on output transistor
Maximum power dissipation on output
resistor
Zener diode working voltage
Maximum power dissipation in Zener diode
12
3
/h with a slope of
3
Saturation at 4 [m /h]
2.0 3.0 4.0
3
Flow [m /h]
Symbol Value
f 100-4000 Hz
< 3 W
U 4-24 V
iH
U < 1 V
iL
I < 10 mA
iH
PWM 0-100 %
f 75 Hz ± 5 %
± 2 % (of
PWM signal)
3
± 0.1 m /h
3
± 0.2 m /h
PWM 0-100 %
U < 70 V
c
I < 50 mA
c
P 60 mW
R
U 36 V
z
P 500 mW
z
LIN bus (on request)
On request, there is an option of Medium UPM pumps
with LIN bus communication. This data bus has been
developed as a Local Interconnect Network (LIN) in
the automotive sector and is used in vehicles.
"VDMA Einheitsblatt 24226" defines the specification
of an appliance-integrated fieldbus system based on
the LIN bus. With the LIN bus, serial data can be
transmitted for control, monitoring and analysis.
Data transmitted from the LIN bus can be defined by
Grundfos.
CONNECTIVITY
LI N BUS
•
V
Fig. 10 LIN bus on fieldbus of heating control systems
Medium UPM
BMS
BUILDING MANAGEMENT
SYSTEM
M p