English (GB)
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14. External PWM control mode and signals
PWM can only operate when the pump is in curve 4 operation.
PWM profile C input signal
At high PWM-signal percentages (duty cycles), a hysteresis
prevents the circulator pump from starting and stopping if the
input signal fluctuates around the shifting point. At low
PWM-signal percentages, the circulator speed is high for safety
reasons. In case of a cable breakage in a solar system, the
circulator pumps will continue to run at maximum speed to
transfer heat from the primary heat exchanger.
Fig. 48 PWM input profile C
15. Digital solar-circuit controller
To replace UPS SOLAR with a new ALPHA SOLAR pump which
fulfils the EuP norm, we offer two solutions:
• Replace the SOLAR controller with a controller suitable for
high-efficiency pumps.
• Keep the old controller and use the pump with phase control.
Use a converter, SIKON HE, which can convert the phase
control to a PWM signal.
When you use SIKON HE, you can replace the conventional
230-V UPS solar pumps by Grundfos ALPHA SOLAR pumps
without having to change the controller to a high-efficiency pump
controller. The function of the performance control of the pump is
maintained.
Fig. 49 Digital solar circuit controller
For further information about the controller, see www.prozeda.de.
16. Technical data
TM04 9985 0311
PWM input signal
[%]
Pump status
≤ 10 Maximum speed: max.
> 10 / ≤ 84 Variable speed: min. to max.
> 84 / ≤ 91 Minimum speed: nominal speed
> 91/95 Hysteresis area: on/off
> 95 / ≤ 100 Standby mode: off
Max.
PWM input signal [%]
Speed
TM065809 0216
System pressure Maximum 1.0 MPa (10 bar)
Minimum inlet pressure
0.05 MPa (0.50 bar) at a liquid
temperature of 95 °C
Maximum liquid
temperature
2-110 °C at an ambient temperature
of 70 °C
2-130 °C at an ambient temperature
of 60 °C
Enclosure class IPX4D
Motor protection No external protection needed
Approvals and
markings
VDE, CE
Water-propylene glycol
mixture
Maximum water-propylene glycol
mixture is 50 %.
Note: The water-propylene glycol
mixture reduces the performance due
to higher viscosity.
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