Tuxhorn tubra-eTherm, Manual

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en
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Installation
Indications,
functions and options
Messages
Commissioning
Operation and function
4.5.3 Messages
In the Status / Messages menu, error and warning messages are indicated.
During normal operation, the message Everything OK is indicated.
A message consists of a short text about the fault condition.
Display Description
!VBus Sensor unit VBus ® communication disturbed
!VBus Power unit VBus ® communication disturbed
!Sensor error S1 … S3 Sensor defective
In the case of an error, the control LED starts flashing red and a message is indicated
in the status display. In the case of a sensor error, the system switches off, and a
message appears on the display.
If the VBus
® communication is disturbed, the operating control LED flashes red/
green.
After the error has been removed and acknowledged, the error message disappears.
4.6 Controller menu
In this menu, all adjustments for the hydraulic part of the tubra ® -eTherm can be
made.
The target temperature and the maximum return temperature have already been
adjusted during commissioning.
Adjustment channel Description
Adjustment range /
selection
Factory setting
Targ. temp.
Target temperature control
30 … 70 °C
60 °C
Minimum temp.
Minimum temperature
20 … 50 °C
30 °C
Hysteresis Hysteresis minimum temperature 1 … 10 K 5 K
∆
Ton
Switch-on temperature difference 2 … 20 K 6 K
∆
Toff
Switch-off temperature difference 1 … 19 K 4 K
REmax Maximum return temperature 20 … 70 °C 65 °C
Min speed
Minimum speed
5 … 100 % 24 %
Max speed
Maximum speed
5 … 100 %
100 %
Reserve
Reserve which is not used for
heating
0 … 9000 W 100 W
If the temperature difference between the flow sensor S1 and the return sensor S2
reaches or exceeds the switch-on temperature difference, the pump switches on.
For this purpose, the adjusted value for the minimum temperature has to be
exceeded at S1. The switch-on hysteresis is adjustable.
The controller aims to keep the flow temperature at the adjusted target tem-
perature. For this purpose, the controller adjusts the pump speed. The minimum
and the maximum pump speed can be adjusted by means of the parameters Min
speed and Max speed.
If the temperature at the flow sensor reaches 85 °C, the heating switches off. In
order to avoid this emergency shutdown, the pump speed increases up to 100 % (in
steps) as soon as the target temperature is exceeded. The electric heating remains
switched on during this process.
If the temperature at the return sensor reaches the adjusted maximum return
temperature (maximum store temperature), the pump and the electric heating
switch off. The maximum return temperature serves as the maximum store tem-
perature. The controller changes to the Max. temp. status (maximum shutdown).
The maximum shutdown is used for shutting down the PV heating in order to
prevent overheating of the store.