Grundfos UPM3S Series User Manual

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 pumps will continue to run at maximum
speed to transfer heat from the primary heat exchanger.
This is also suitable for heat pumps to ensure that the
pumps transfer heat in case of a cable breakage.
Max.
10
20
30 40
50 60 70
80
90
100
TM049985
PWM input profile A (heating)
Axis Value
X PWM input signal [%]
Y Speed
PWM input signal [%] Pump status
≤ 10 Maximum speed
> 10 / ≤ 84
Variable speed from minimum to maximum
speed
> 84 / ≤ 91 Minimum speed
> 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.
10 20
30
40 50
60
70
80
90 100
TM051575
PWM input profile C (solar)
Axis Value
X PWM input signal [%]
Y Speed
PWM input signal
[%]
Pump status
≤ 5 Standby mode: off
> 5 / ≤ 8 Hysteresis area: on/off
> 8 / ≤ 15 Minimum speed
> 15 / ≤ 90 Variable speed from minimum to maximum speed.
> 90 / ≤ 100 Maximum speed
UPM3
7
18
External control mode and signals

Grundfos UPM3S Series Specifications

General

Brand	Grundfos
Model	UPM3S Series
Category	Water Pump
Language	English