“Solar” function
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3.4
Setting the pump control system
You can connect standard pumps and high-efficiency pumps (HE pumps). For these you
can set the following types of control system:
•
230 V block modulation (standard pumps)
•
Analog control (HE pumps)
•
Non-inverted PWM control (HE pumps)
•
Inverted PWM control (HE pumps)
In order to keep the storage tank temperature as constant as possible, the solar circuit
pumps can be controlled by means of speed control. You can set the minimum pump
output with speed control between 30 % and 100 %. At 100 % the speed control will be
switched off.
For this function you can set the following parameters:
•
Basic settings/Solar circuit/Pump type R1 (R2, R3)
•
Program/Solar circuit/Speed control
For HE pumps the following applies:
Switching outputs R1 and R2 switch only the pump supply. They are not speed-
controlled. Their minimum switch-on time is 5 seconds.
To reduce the switching frequency of the high-efficiency pump, it is better to
connect it directly to the 230V supply.
Controlling HE pumps with analog signals
In the case of the pump control system complete with analog signal, the controller sends
a 0–10 V analog signal to terminals HE1 and HE2.
Definitions for the output voltage (U):
•
Pump off: 0.5 V < U < 1.0 V
•
Speed control: Linear characteristic 3 V < U < 10 V (for a minimum pump output of
30 %)
The following diagram shows the power curve for the pump control system with analog
signal.
n (%) – Pump output
U (V) – Output voltage
