en
20
Installation
Indications,
functions and options
Messages
Commissioning
Operation and function
If the temperature at the return sensor reaches the adjusted return maximum tem-
perature, loading is blocked for 15 min. The blocking time is indicated in the status
menu (countdown). The controller is ready again, if the temperature falls below the
maximum return value by 2 K after the blocking time has elapsed.
The Reserve is an adjustable excess power which is fed into the grid and not used
for heating. The reserve can be used, e. g. in large PV systems, in order to start the
heating at a later point in time. This reduces power peaks at noon.
As long as the heating power is > 0 W, the power supply over R1 remains switched
on, even if the speed signal is 0 %. This guarantees a fast start-up of the pump.
Note
The target temperature is blocked against the minimum temperature by 1 K.
4.7
Measuring unit
In this menu, the source for the immersion heater power control can be defined.
The following options are available:
• Measuring unit (Module)
• External 0-10 V power control (10V IN)
Adjustment channel /
Indication
Description
Adjustment range / Indi-
cation range / Selection
Factory setting
Variant
Power control source
Module, 10V IN
Module
Meas. value
Signal indication
0.0 … 10.0 V
-
Heat. pow.
Heat energy indication
1 … 3000 W
-
Volt 0kW
Lower voltage
0.0 … 9.0 V
1.0 V
Volt 3kW
Upper voltage
1.0 … 10.0 V
10.0 V
10V IN
With the 10V IN variant, the power control takes place via an external 0-10 V
signal (terminals 7 and 8 of the power unit).
The parameters Volt 0kW and Volt 3kW can be used for adjusting the power
control curve.
Note
Since there is no communication with the measuring unit in this variant, no
excess is measured and balanced.
Optional functions which require the measuring unit are not available or
are deleted.
Summary of Contents for tubra-eTherm
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