Grundfos UPML 25-105 130 - Page 12

Control mode and signals
12
Medium UPM
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
/h with a slope of
0.057 m
3
/h / % PWM.
Fig. 9 PWM feedback signal - flow estimation
Data
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.
Fig. 10 LIN bus on fieldbus of heating control systems
TM07 1789 2218
Maximum rating Symbol Value
PWM frequency input with high-speed
optocoupler
f 100-4000 Hz
Guaranteed standby power consumption < 3 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
Note: A PWM output signal below 5 % is too
inaccurate for the calculation of the flow.
± 2 % (of
PWM signal)
Accuracy of output signal regarding flow:
< 1 m
3
/h
> 1 m
3
/h
± 0.1 m
3
/h
± 0.2 m
3
/h
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
60 mW
Zener diode working voltage U
z
36 V
Maximum power dissipation in Zener diode P
z
500 mW
10
20
30
40
50
60
70
80
90
100
0 1.0 2.0 3.0 4.0
Flow [m
3
/h]
Standby (stop)
Alarm stop: Fault, blocked pump
Alarm stop: Electrical fault
Warning
Saturation at 4 [m
3
/h]
0
.
0
-
4
[
m
3
/
h
]
(
S
l
o
p
e
:
0
.
0
5
7
[
m
3
/
h
]
Warning: Electronics high temp.
PWM output [%] (output frequency 75 Hz ± 5 %)
TM07 2079 2618
CONNECTIVITY
LIN BUS
M ࢡ pV
•
BMS
BUILDING MANAGEMENT
SYSTEM