Control mode and signals
11
Medium UPM
5
PWM input signal profile A (heating)
At high PWM signal percentages (duty cycles), a
hysteresis prevents the pump from starting and
stopping if the input signal fluctuates around the
shifting point. At low PWM signal percentages, the
pump speed is high for safety reasons. In case of a
cable breakage in a gas boiler system, the pump
continues to run at maximum speed to transfer heat
from the primary heat exchanger. This is also suitable
for heating pumps to ensure that the pumps transfer
heat in case of a cable breakage.
Fig. 6 PWM input profile A (heating)
PWM input signal profile C (solar)
At low PWM signal percentages (duty cycles), a
hysteresis prevents the pump from starting and
stopping if the input signal fluctuates around the
shifting point. Without PWM signal percentages, the
pump will stop for safety reasons. If a signal is missing,
for example due to a cable breakage, the pump will
stop to avoid overheating of the solar thermal system.
Fig. 7 PWM input profile C (solar)
PWM feedback signal - power consumption
(standard)
The PWM feedback signal offers pump information like
in bus systems:
• current power consumption (accuracy ± 2 % of
PWM signal)
• warning
•alarm
• operation status.
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 blocked due to deposits in the
hydraulics, the output signal is set to 90 %, because
this alarm has a higher priority.
Fig. 8 PWM feedback signal, power consumption
QT = qualification time, DT = disqualification time
TM07 1737 2218
PWM input signal
[%]
Pump status
≤ 10 Maximum speed: max.
> 10 / ≤ 84 Variable speed: min. to max.
> 84 / ≤ 91 Minimum speed: min.
> 91/95 Hysteresis area: on/off
> 95 / ≤ 100 Standby mode: off
TM07 1738 2218
PWM input signal
[%]
Pump status
≤ 5 Standby mode: off
> 5 / ≤ 8 Hysteresis area: on/off
> 8 / ≤ 15 Minimum speed: min.
> 15 / ≤ 90 Variable speed: min. to max.
> 90 / ≤ 100 Maximum speed: max.
510 5020 30 40 60 70 80 90 100
Max.
PWM input signal [%]
Speed
510 5020 30 40 60 70 80 90 100
Max.
PWM input signal [%]
Speed
TM07 1739 2218
Pos. Type Description
1 UPMM, UPML, SOLAR PML
slope 2 W/%, saturation point,
140 W
2 UPMXL, UPMXXL
slope 3 W/%, saturation point,
210 W
PWM output
signal
[%]
QT
[s]
Pump info
DT
[s]
Priority
95 0 Standby (STOP) by PWM signal 0 1
90 30 Alarm, stop, blocked error 12 2
85 0-30 Alarm, stop, electrical error 1-12 3
75 0 WARNING 0 5
0-70 0-140 W (slope 2 W/% PWM) 6
Output frequency: 75 Hz ± 5 %
25 50 100 150 200 250
10
20
30
40
50
60
70
80
90
100
1
2
Standby (stop)
Alarm stop: Fault, blocked pump
Alarm stop: Electrical fault
S
l
o
p
e
:
2
W/
%
Power [W]
PWM output [%] (output frequency 75 Hz ± 5 %)
S
l
o
p
e
:
3
W
/
%
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