en
5
Installation
Indications,
functions and options
Messages
Commissioning
Operation and function
2
System overview
The control unit consists of the controller, the power unit and the measuring unit.
The measuring unit measures the current flow directly at the energy meter. If the
power is high enough, the PV current can be used for electrically heating the water
in the store. By means of the power unit the controller controls the 3 power stages
in the electrothermal station for store heating.
In order to compensate for thermal losses, an internally calculated switch-on power
has to be exceeded. An additional supply reserve prevents using power from the
mains because of system-related tolerances (see Status / Controller on page
page 18).
The pump speed is adapted so that the target temperature at S1 is reached for
store loading in layers. If the maximum store temperature (S2) is reached, loading
stops.
Optionally, different optional functions can be activated, see page 21.
• Backup heating internal/external
• S0 outputs heating, excess
• 0-10 V power control
• Inverter power limitation
• Additional external load, external load 2
• Smart remote access
Sensors
S1
Flow temperature
1 / GND
S2
Return temperature
2 / GND
S3
Store temperature
(optional)
3 / GND
S4
Free / switching input
4 / GND
S5
Free / switching input
5 / GND
Relay
R1
Loading pump
R1 / N / PE
R2
External backup
heating
External load 2
(optional)
R2 / N / PE
R3
External load (op-
tional)
R3 / N / PE
R4
Power limitation
Inverter
8 / 10
Energy
meter
Controller
Measuring unit
Power unit
VBus
®
Hydraulics
Hot water store
Loads
Inverter
PV generator
VBus
®
Summary of Contents for tubra-eTherm
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