Grundfos Medium UPM Series Data Booklet page 11

Medium UPM
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.
Max.
5 10 20 30 40 50
PWM input signal [%]
Fig. 6 PWM input profile A (heating)
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
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.
Max.
5 10 20 30 40 50
PWM input signal [%]
Fig. 7 PWM input profile C (solar)
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.
60 70 80 90 100
60 70 80 90 100
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.
100
Standby (stop)
Alarm stop: Fault, blocked pump
90
Alarm stop: Electrical fault
80
70
60
50
40
30
20
10
25 50 100
Fig. 8 PWM feedback signal, power consumption
Pos. Type
1 UPMM, UPML, SOLAR PML
2 UPMXL, UPMXXL
PWM output
QT
signal Pump info
[s]
[%]
95 0 Standby (STOP) by PWM signal
90 30 Alarm, stop, blocked error
85 0-30 Alarm, stop, electrical error
75 0 WARNING
0-70 0-140 W (slope 2 W/% PWM)
Output frequency: 75 Hz ± 5 %
QT = qualification time, DT = disqualification time
2
1
150 200 250
Power [W]
Description
slope 2 W/%, saturation point,
140 W
slope 3 W/%, saturation point,
210 W
DT
Priority
[s]
0 1
12 2
1-12 3
0 5
6
5
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