Tuxhorn tubra-eTherm User manual

*11212846* 11212846
tubra®-eTherm
Manual
en
Control unit
Manual for the
specialised craftsman
Installation
Operation
Functions and options
Troubleshooting
Thank you for buying this product.
Please read this manual carefully to get the best performance from this unit. Please keep this manual safe.
beginning with version 2.00

2
en
© 20181217_11212846_Tuxhorn_tubra_eTherm.monen_iA
Safety advice
Please pay attention to the following safety advice in order to avoid danger and
damage to people and property.
Instructions
Attention must be paid to the valid local standards, regulations and directives!
Information about the products
Proper usage
tubra®-eTherm is a control unit designed for use in electrothermal stations for
using excess PV current for heating a store in compliance with the technical data
specified in this manual.
Improper use excludes all liability claims.
CE-Declaration of conformity
The product complies with the relevant directives and is therefore la-
belled with the CE mark.The Declaration of Conformity is available upon
request, please contact the manufacturer.
Note
Strong electromagnetic fields can impair the function of the device.
ÎMake sure the device as well as the system are not exposed to strong
electromagnetic fields.
Subject to technical change. Errors excepted.
Target group
These instructions are exclusively addressed to authorised skilled personnel.
Only qualified electricians are allowed to carry out electrical works.
Initial commissioning must be effected by the system installer or qualified personnel
named by the system installer.
Description of symbols
WARNING! Warnings are indicated with a warning triangle!
ÎThey contain information on how to avoid the danger
described.
Signal words describe the danger that may occur, when it is not avoided.
• WARNING means that injury, possibly life-threatening injury, can occur.
• ATTENTION means that damage to the appliance can occur.
Note
Notes are indicated with an information symbol.
ÎArrows indicate instruction steps that should be carried out.

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tubra®-eTherm
tubra®-eTherm is a hydraulic unit with an integrated control unit for storing PV
current in the form of thermal energy in order to optimise the self-consumption.
The integrated power measuring unit is installed at the feed-in point to the grid at
the energy meter. In this way, household current priority is ensured by the system.
The compact hydraulic unit can be connected to DHW stores and buffer stores.
tubra®-eTherm can be easily fitted to existing stores.
Scope of delivery tubra®-eTherm
Controller (tubra®-eTherm controller)
Power unit (tubra®-eTherm power)
Measuring unit (tubra®-eTherm sensor) and current sensors
tubra®-eTherm

VBus®


Contents
1 tubra®-eTherm..................................................................................4
2 System overview...............................................................................5
3 Installation.........................................................................................6
3.1 Mounting ....................................................................................................................6
3.2 Electrical connection...............................................................................................6
3.3 MicroSD slot of the controller ...........................................................................11
4 Operation and function of the controller.....................................11
4.1 Buttons and adjustment dial ................................................................................11
4.1.1 Control lamp...........................................................................................................11
4.1.2 Selecting menu points and adjusting values......................................................12
4.2 Menu structure.......................................................................................................15
4.3 Commissioning .......................................................................................................16
4.4 Main menu ...............................................................................................................17
4.5 Status ........................................................................................................................18
4.5.1 Controller................................................................................................................18
4.5.2 Measured / Balance values ...................................................................................18
4.5.3 Messages ..................................................................................................................19
4.6 Controller menu ....................................................................................................19
4.7 Measuring unit ........................................................................................................20
4.8 Optional functions .................................................................................................21
4.9 Basic settings...........................................................................................................25
4.10 MicroSD card..........................................................................................................26
4.11 Manual mode...........................................................................................................27
4.12 User code ................................................................................................................28
5 Troubleshooting ..............................................................................28
6 Index.................................................................................................31

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1 tubra®-eTherm
• Increase in self-consumption of the PV system
• Environmental protection and reduction of heating costs
• Store excess PV current as regenerative thermal energy
• Optimisation of solar current feed-in
• Can be fitted to all central heating and hot water systems
• One solar system for current and heat
Technical data controller
Inputs: 4 Pt1000 temperature sensors, 2 digital switching inputs
Outputs: 3 semiconductor relays, 1 potential-free extra-low voltage relay, 1 PWM output
PWM frequency: 512 Hz
PWM voltage: 10.8 V
Switching capacity:
1 (1) A 240 V~ (semiconductor relay)
1 (1) A 30 V⎓(potential-free relay)
Total switching capacity: 3 A 240 V~
Power supply: 100 … 240 V~ (50 … 60 Hz)
Supply connection: type Y attachment
Standby: < 1 W
Mode of operation: type 1.B.C.Y action
Rated impulse voltage: 2.5 kV
Data interface: VBus®, MicroSD card slot
VBus®current supply: 60 mA
Functions: controlling a hydraulic group and electric heater for using excess PV cur-
rent for heating a store, internal backup heating, external backup heating, S0 Excess, S0
Heating, Smart Remote, external load, inverter
Housing: plastic, PC-ABS and PMMA
Montage: integrated in the station
Indication / Display: full graphic display, control LED (Lightwheel®) and background
illumination
Operation: 2 push buttons and 1 adjustment dial (Lightwheel®)
Protection type: IP 20 / EN 60529
Protection class: I
Ambient temperature: 0 … 40 °C
Degree of pollution: 2
Dimensions: 110 x 166 x 47 mm
Technical data measuring unit
Inputs: 3 current inputs for CT, 3 voltage inputs
Outputs: 2 digital S0 impulse outputs
Power supply: 100 … 240 V~ (50 … 60 Hz)
Supply connection: type Y attachment
Standby: < 1 W
Rated impulse voltage: 1.0 kV
Data interface: VBus®
Functions: energy measuring unit
Housing: plastic, PC (UL 94 V-0)
Mounting: DIN rail in the domestic distribution board
Indication / Display: 2 operating control LEDs
Protection type: IP 20 / EN 60529
Protection class: II
Ambient temperature: 0 … 40 °C
Degree of pollution: 2
Dimensions: 71 x 90 x 58 mm
Technical data power unit
Inputs: 1 PWM input, 1 0-10 V input
Outputs: 3 semiconductor relay
Total switching capacity: 16A 250 V~
Power supply: 220 … 240 V~ (50 … 60 Hz)
Supply connection: type Y attachment
Standby: < 1 W
Mode of operation: type 1.C.Y action
Rated impulse voltage: 2.5 kV
Data interface: VBus®
Functions: controlling an electric heater for using excess PV current for heating a store
Housing: metal
Mounting: integrated in the station
Protection type: IP 10 / EN 60529
Protection class: I
Ambient temperature: 0 … 40 °C
Degree of pollution: 2
Dimensions: 225 x 130 x 95 mm

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InstallationIndications, functions and optionsMessages 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
• 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 heat-
ing (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®

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3 Installation
3.1 Mounting
WARNING! Electric shock!
Upon opening the housing, live parts are exposed!
ÎAlways disconnect the device from power supply
before opening the housing!
Note
Strong electromagnetic fields can impair the function of the device.
ÎMake sure the device as well as the system are not exposed to strong
electromagnetic fields.
The devices must only be located in dry and dust-free interior rooms.
The controller must additionally be supplied from a double pole switch with contact
gap of at least 3 mm.
Please pay attention to separate routing of sensor cables and mains cables.
Step-by-step installation:
ATTENTION! Damage by overheating!
Commissioning the power stages in a system electrically con-
nected, but not hydraulically filled can lead to damage caused by
overheating!
ÎMake sure the hydraulic system is filled and ready for
operation.
ÎMake sure the hydraulic system is filled and ready for operation.
The controller and the power unit are integrated in the electrothermal station.
ÎMount the measuring unit on a DIN rail in the domestic distribution board
as close as possible to the energy meter. Make sure that no load is installed
between the measuring unit and the energy meter.
ÎConnect the current sensors and the conductors of the measuring unit in
phase directly at the energy meter (see page 7).
ÎConnect the measuring unit with the tubra®-eTherm by means of the VBus®
(see page 7 and page 9).
ÎEstablish the power supply of the controller (see page 9).
ÎRun the commissioning menu (see page 16).
ÎCarry out the desired adjustment in the controller menu (see page 19).
3.2 Electrical connection
WARNING! Electric shock!
Upon opening the housing, live parts are exposed!
ÎAlways disconnect the device from power supply
before opening the housing!
ATTENTION! ESD damage!
Electrostatic discharge can lead to damage to electronic com-
ponents!
ÎTake care to discharge properly before touching the
inside of the device! To do so, touch a grounded sur-
face such as a radiator or tap!
Note
The connection to the power supply must always be the last step of the
installation!
Do not use the devices if they are visibly damaged!
The power unit is supplied with power via a mains cable.The power supply of the
device must be 100… 240 V~ (50 … 60 Hz). The cross section of the cable must
be 2.5 mm².
The controller is supplied with power via the power unit.
Controller
N⏚L1
Measuring unit
Power unit
VBus®VBus®

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
Measuring unit
CTL3
CTL2CTL1
L2
L3
L1
N
tubra®-eTherm sensor
Made in Germany
Versorgung /Power supply
160mA 240V~
Betrieb /Power
Störung /Error
DE-33659 Bielefeld
VBus
S0-2S0-1
A B
C
VBus®cable to tubra®-eTherm
A
Power supply:
Neutral conductor N
Conductor 1 L1
Conductor 2 L2
Conductor 3 L3
B
Current sensors:
Current sensor CTL1
Current sensor CTL2
Current sensor CTL3
C
Data communication VBus®
The connection is to be carried out at the terminals marked VBus (either polarity).
The bus cable can be extended with a two-wire cable (bell wire).The cable carries
low voltage and must not run together in a cable conduit with cables carrying a
higher voltage than 50 V (please pay attention to the valid local regulations). The
cross section must be at least 0.5 mm2and the cable can be extended up to 50 m in
the case of a single connection.
D
Digital S0 impulse outputs
S0-1: Heating
S0-2: Excess
The S0 outputs can be used for transferring the heat energy of the tubra®-eTherm
to external energy management systems and for feeding the excess into the public
grid.
D

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Three-phase connection
ÎConnect the current sensors and the conductors of the measuring unit in
phase directly at the energy meter.The arrow indicated on the current sensors
must point in the direction of the loads.
All 3 phases have to be connected to the measuring unit.
CTL3
CTL2CTL1
L2
L3
L1
N
L2
L1 N
L3
Versorgung /Power supply
160mA 240V~
LK
LK
LK
red
red
red
black
Energy meter
black
black
Note
The 3 phases have to be protected by means of a three-phase
16 A circuit-breaker (not included with the device).
Single-phase connection
ÎConnect the current sensor and the conductor L1 of the measuring unit direct-
ly at the energy meter.The arrow indicated on the current sensor must point
in the direction of the loads.
ÎShort circuit the connections of CTL2 as well as those of CTL3.
CTL3
CTL2CTL1
L2
L3
L1
N
L2
L1 N
L3
Versorgung /Power supply
160mA 240V~
LK
red
Energy meter
black
Note
The phase has to be protected by means of a single-phase 16
A circuit-breaker (not included with the device).

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
Controller
VBus
VBus
S4 S5 R4 S3
GND
Made in Germany
tubra®-eTherm controller
DE-33659 Bielefeld
Sensors
S2 S1
100 ... 240 V
T4A
50-60 Hz
N
R2 R3 R1
L
R1-R3|1 (1) A 240V~
IP 20
PWM
SD
R4
NN N N
R3 R2 R1 L
1234
56789
10 11
S6
S7
The power supply via the power unit is at the terminals:
Neutral conductor N
Conductor L
Protective earth conductor ⏚
The controller is equipped with 4 relays in total. The loading pump is connected
to R1.
• Relays 1 ... 3 are semiconductor relays, designed for pump speed control:
Conductor R1 … R3
Neutral conductor N
Protective earth conductor ⏚
• Relay 4 is a potential-free extra-low voltage relay.
Mains and sensor cables are already connected to the device.
Further temperature sensors can be connected to the terminals S3 and S4 (ei-
ther polarity).
S4 and S5 can be used as digital switching inputs with either polarity.
S6 and S7 are impulse inputs (no function).
The terminal marked PWM is the control output for a high-efficiency pump.
The controller is equipped with the VBus®for data communication.The connec-
tion is to be carried out at the terminals marked VBus (either polarity).The power
unit and the measuring unit are connected via this data bus.
Note
For more details about the commissioning procedure see page 16.
VBus
VBus
S4 S5 R4 S3
GND
Made in Germany
tubra®-eTherm controller
DE-33659 Bielefeld
Sensors
S2 S1
100 ... 240V
T4A
50-60 Hz
N
R2 R3 R1
L
R1-R3|1 (1) A 240V~
IP 20
PWM
SD
R4
NN N N
R3 R2 R1 L
1234
56789
10 11
S6
S7
A1 135
A2 246
Note
The optional function External load switches relay 3 (see page 24).
As an external load usually has a high power consumption, it must be
controlled by means of an auxiliary relay.

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Installation Indications, functions and options MessagesCommissioningOperation and function
Power unit
STB
tubra®-eTherm power
Made in Germany
T16A 250V~ PE
L
N
Out1_N
Out2_N
Out2_L
Out1_L
Out3_L
Out3_N
DE-33659 Bielefeld
10
9
8
7
6
5
4
3
2
1
VBus
0-10V
PWM
PWM
GND
VBus
PE
L'
N
Regler
Controller
Netz
Mains
800W
800 W
1400 W
800W
800 W
1400 W
F5A 250V~
A
B
C
D
Note:
It must be possible to disconnect the device from the mains at any time.
ÎInstall the mains plug so that it is accessible at any time.
ÎIf this is not possible, install a switch that can be accessed.
A
Power supply of the controller:
Neutral conductor N
Conductor L'
Protective earth conductor ⏚
B
Mains connection of the electric
heater:
Neutral conductor N
Conductor L
Protective earth conductor ⏚
C
Connection of the electric heater:
Neutral conductor 1400 W Out1_N
Conductor 1400 W Out1_L
Neutral conductor 800 W Out2_N
Conductor 800 W Out2_L
Neutral conductor 800 W modulating Out3_N
Conductor 800 W modulatingOut3_L
D
Internal supply / data communication:
Terminal 1 cooling element sensor
Terminal 2 cooling element sensor
Terminal 3 fan
Terminal 4 fan
Terminal 5 VBus®
Terminal 6 VBus®
E
External interfaces
Terminal 7 GND
Terminal 8 0-10 V input
Terminal 9 PWM input
Terminal 10 PWM input
E

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
3.3 MicroSD slot of the controller
The controller is equipped with a MicroSD card slot.
With a MicroSD card, the following functions can be carried out:
• Store measurement and balance values onto the MicroSD card.After the trans-
fer to a computer, the values can be opened and visualised, e.g. in a spreadsheet.
• Prepare adjustments and parameterisations on a computer and transfer them via
the MicroSD card.
• Store adjustments and parameterisations on the MicroSD card and, if necessary,
retrieve them from there.
• Download firmware updates from the Internet and install them on the controller
via MicroSD card.
MicroSD card slot
A MicroSD card is not included, but can be purchased from the manufacturer.
Note
For more information about using a MicroSD card, see page 25.
4 Operation and function of the controller
4.1 Buttons and adjustment dial
The controller is operated via 2 buttons and 1 adjustment dial (Lightwheel®) below
the display:
Left button (⟲) - escape button for changing into the previous menu
Right button (✓) - confirming / selecting
Lightwheel®- scrolling upwards / scrolling downwards, increasing adjustment
values / reducing adjustment values
4.1.1 Control lamp
The controller is equipped with a multicolour LED in the centre of the Lightwheel®,
indicating the following states:
Colour Permanently shown Flashing
Green
Everything OK Manual mode: at least one relay in manual oper-
ation
Red
Sensor line break, sensor short circuit
Red/
Green
VBus®defective/ no communication with the
measuring unit or power unit respectively
Yellow
SD card full, maximum flow temperature exceeded

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Installation Indications, functions and options MessagesCommissioningOperation and function
4.1.2 Selecting menu points and adjusting values
During normal operation of the controller, the display shows the Status menu.
If no button is pressed for 1min, the display illumination switches off.After 3 more
minutes, the controller switches to the Status menu.
In order to get from the Status menu into the Main menu, press the left button
(⟲)!
Press any key to reactivate the display illumination. In order to scroll through the
menu items, turn the Lightwheel®.
If the symbol ⏩is shown behind a menu item, pressing the right button (✓) will
open a new submenu.
Values and options can be changed in different ways:
Numeric values can be adjusted by means of a slide bar.The minimum value is indi-
cated to the left, the maximum value to the right.The large number above the slide
bar indicates the current adjustment.By turning the Lightwheel®, the upper slide bar
can be moved to the left or to the right.
Only after the adjustment has been confirmed by pressing the right button (✓) will
the number below the slide bar indicate the new value.The new value will be saved
if it is confirmed by pressing the right button (✓) again.
When 2 values are locked against each other, they will display a reduced adjustment
range depending on the adjustment of the respective other value.
In this case, the active area of the slide bar is shortened,the inactive area is indicated
as a dotted line.The indication of the minimum and maximum values will adapt to
the reduction.
If only one item of several can be selected, they will be indicated with "radio but-
tons".When one item has been selected, the radio button in front of it is filled.

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
Adjusting the timer
When the Timer option is activated, a timer is in-
dicated in which time frames for the function can be
adjusted.
In the Day selection channel, the days of the week
are available individually and as frequently selected
combinations.
If more than one day or combination is selected, they
will be merged into one combination for the following
steps.
The last menu item after the list of days is Continue.
If Continue is selected, the timer menu opens, in which
the time frames can be adjusted.
Adding a time frame:
In order to add a time frame, proceed as follows:
ÎSelect New time frame.
ÎAdjust Start and Stop for the desired time frame.
The time frames can be adjusted in steps of 5 min.
ÎIn order to save the time frame, select Save and
confirm the security enquiry with Ye s .
ÎIn order to add another time frame, repeat the
previous steps.
6 time frames can be adjusted per day or combination.
ÎPress the left button (⟲) in order to get back to
the day selection.

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Installation Indications, functions and options MessagesCommissioningOperation and function
Copying a time frame:
In order to copy time frames already adjusted into an-
other day / another combination, proceed as follows:
ÎChoose the day / the combination into which the
time frames are to be copied and select Copy
from.
A selection of days and / or combinations with time
frames will appear.
ÎSelect the day or combination from which the
time frames are to be copied.
All time frames adjusted for the selected day or com-
bination will be copied.
If the time frames copied are not changed, the day or
combination will be added to the combination from
which the time frames have been copied.
Changing a time frame:
In order to change a time frame, proceed as follows:
ÎSelect the time frame to be changed.
ÎMake the desired change.
ÎIn order to save the time frame, select Save and
confirm the security enquiry with Ye s .
Removing a time frame:
In order to delete a time frame, proceed as follows:
ÎSelect the time frame that is to be deleted.
ÎSelect the menu item Delete and confirm the se-
curity enquiry with Ye s .

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
Resetting the timer:
In order to reset time frames adjusted for a certain day
or combination, proceed as follows
ÎSelect the desired day or combination.
ÎSelect Reset and confirm the security enquiry
with Ye s .
The selected day or combination will disappear from
the list, all its time frames will be deleted.
In order to reset the whole timer, proceed as follows:
ÎSelect Reset and confirm the security enquiry
with Ye s .
All adjustments made for the timer are deleted.
4.2 Menu structure
Main menu
Status
Controller
Measuring unit
Optional functions
Basic settings
SD card
Manual mode
User code
Controller
Target temperature
Minimum temperature
Hysteresis
∆To n
∆Toff
…
Basic settings
Language
Auto DST
Date
Time
Target temperature
Reset
…
Optional functions
Internal backup heating
External backup heating
S0 Excess
S0 Heating
Smart Remote
External load
Inverter
The menu items and adjustment values selectable are variable depending on adjust-
ments already made.The figure only shows an exemplary excerpt of the complete
menu in order to visualise the menu structure.

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Installation Indications, functions and options MessagesCommissioningOperation and function
4.3 Commissioning
When the hydraulic system is filled and ready for operation, connect the power
unit to the mains.
The controller has to be connected to the power unit (already connected) and to
the measuring unit by means of theVBus®.
The controller runs an initialisation phase in which the Lightwheel®glows red.
When the controller is commissioned or when it is reset, it will run a commis-
sioning menu after the initialisation phase.The commissioning menu leads the user
through the most important adjustment channels needed for operating the system.
Commissioning menu
The commissioning menu consists of the channels described in the following. In
order to make an adjustment, adjust the desired value with the Lightwheel®and
confirm with the right button (✓).The next channel will appear in the display.
Adjustment mode
Operation
Changing a value
Confirming a value
Next parameter
1. Language:
ÎAdjust the desired menu language.
2. Daylight savings time adjustment:
ÎActivate or deactivate the automatic daylight sav-
ings time adjustment.
3. Date:
ÎAdjust the date. First of all adjust the year, then the
month and then the day.
4. Time:
ÎAdjust the clock time. First of all adjust the hours,
then the minutes.
5. Target temperature:
ÎAdjust the desired target temperature.
6. Maximum return temperature (maximum
store temperature):
ÎAdjust the desired maximum return temperature.

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
7. Flush?
ÎActivate the flushing option, if necessary.
The flushing option is used for venting the heating el-
ement.
If the flushing option is activated, the loading pump
switches on at 100 % for 1 min.The remaining flushing
time is indicated as a countdown.
The flushing process can be stopped by means of the
escape button (⟲) at any time.
8. Completing the commissioning menu:
Lastly a security enquiry will appear. If the security en-
quiry is confirmed, the adjustments will be saved.
ÎIn order to confirm the security enquiry, press the
right button (✓).
ÎIn order to reenter the commissioning menu
channels, press the left button (⟲). If the secu-
rity enquiry has been confirmed, the controller is
ready for operation and should enable an opti-
mum system operation.
Note
The adjustments carried out during commissioning can be changed any-
time in the corresponding adjustment channel. Additional functions and
options can also be activated and adjusted.
Set the code to the customer code before handing over the con-
troller to the customer (see page 28).
4.4 Main menu
In this menu, different menu areas can be selected.
The following menus are available:
• Status
• Controller
• Measuring unit
• Optional functions
• Basic settings
• SD card
• Manual mode
• User code
ÎSelect the menu area by turning the Lightwheel®.
ÎPress the right button (✓) in order to enter the selected menu area.
If no button is pressed for 1min, the display illumination switches off.After 3 more
minutes, the controller switches to the Status menu.
ÎIn order to get from the Status menu into the Main menu, press the left button
(⟲)!

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Installation Indications, functions and options MessagesCommissioningOperation and function
4.5 Status
In the Status menu of the controller, controller status messages as well as measure-
ment / balance values and messages can be found.
4.5.1 Controller
In the Status / Controller menu, all current controller values (power values, tem-
peratures, etc.) are indicated.
Display Description
Status Functional state
Blocking Countdown of the blocking time (maximum shutdown)
Inv. limit Power limitation of the inverter active/inactive
Excess Excess power (Reserve / PPV > 3000 W)
Heating Heating power
Load ext. Power of the external load
Flow Temperature flow (S1)
Return Temperature return (S2) (store base)
Store Temperature store top (S3) (optional)
Sensor 4 Temperature sensor 4
Loading pump Loading pump speed
4.5.2 Measured / Balance values
In the Status / Meas./ Balance values menu, all current measurement values as
well as a range of balance values are displayed.
Display Description
S1 … S4 Temperature S1 … S4
S4, S5 Switching state S4, S5
R1 … R4 Operating state relays 1… 4
PWM Operating state PWM output
Excess Wh / kWh / MWh Excess energy in Wh / kWh / MWh
Heating Wh / kWh / MWh Heat energy produced in Wh / kWh / MWh
Heating h Operating hours of the electric heater
Backup heating h Operating hours of the internal backup heating
When a line with a measurement value is selected, another submenu will open.
If, for example, S1 is selected, a submenu indicating the minimum and maximum
values will open.

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InstallationIndications, functions and optionsMessages 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 … 80 °C 60 °C
Minimum temp. Minimum temperature 30 … 80 °C 30 °C
Hysteresis Hysteresis minimum temperature 1 … 10 K 5 K
∆To n Switch-on temperature difference 2 … 20 K 6 K
∆Toff Switch-off temperature difference 1 … 19 K 4 K
REmax Maximum return temperature 20 … 75 °C 65 °C
Min speed Minimum speed 5 … 100 % 15 %
Max speed Maximum speed 5 … 100 % 100 %
Reserve Reserve which is not used for
heating 0 … 9000 W 10 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

en
20
Installation Indications, functions and options MessagesCommissioningOperation and function
prevent overheating of the store.
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 > 0W, 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 … 10.0V -
Heat. pow. Heat energy indication 1 … 3000W -
Volt 0kW Lower voltage 0.0 … 9.0 V 1.0V
Volt 3kW Upper voltage 1.0 … 10.0 V 10.0V
10V IN
With the 10V IN variant, the power control takes place via an external 0-10 V
signal.The signal is issued at the 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.