Application and function of analogue inputs AI1 and AI2

Analogue inputs can be used for setpoint input or actual value input. The allocation of setpoint and actual value specifications are freely configurable.

“Analogue input (AI 1) function” and “Analogue input (AI 2) function” are used to set the type of use (setpoint sensor, differential pressure sensor, external sensor, …), the signal type (0 – 10 V, 0 – 20 mA, …) and the corresponding signal/value assignments. In addition, information about the current settings can be queried.

In the “Settings” menu, select

1. “External interfaces”
2. “Analogue input (AI 1) function” or “Analogue input (AI 2) function”.

After selecting one of the options “Analogue input (AI1) function” or “Analogue input (AI2) function”, select the following query or setting:

Information about the current settings can be retrieved in “Overview of the analogue input”.

The type of use, signal type and signal/values assignment are defined in “Set analogue input”.

The following signal types are available depending on the type of use:

Example setpoint sensor

The following signal types are available for the type of use “Setpoint controller”:

Setpoint sensor signal types:

0 – 10 V: Voltage range of 0 – 10 V for transfer of setpoint values.

2 – 10 V: Voltage range of 2 – 10 V for transfer of setpoint values. Cable break is detected for a voltage below 2 V.

0 – 20 mA: Electric current range of 0 – 20 mA for transfer of setpoints.

4 – 20 mA: Electric current range of 4 – 20 mA for transfer of setpoints. Cable break is detected for a electric current below 4 mA.

Setpoint sensor configuration

The use of an external signal at the analogue input as setpoint source requires pairing of the setpoint value to the analogue signal:

In the “Settings” menu, select

1. “Set auto control”.
2. Depending on the selected control mode, the setpoint editor displays the adjusted setpoint (setpoint delivery head Δp-v, setpoint temperature T-c,…).
2. Select setpoint and confirm by pressing the operating button.
3. Press context button and select “Setpoint of external source:”.

Selection of possible setpoint sources:

After selecting one of the external sources, the “External setpoint source” becomes available to configure the parameters of the external source.
For this purpose, go to the “Settings” menu and select

1. “Set auto control”
2. “External setpoint source”.

Possible selection:

The setpoint source can be changed in select “Setpoint source”.

The setpoint source should be configured when an analogue input is used as source. To do this, select “Set setpoint source”.

Possible selection of type of use to be adjusted:

Select “Setpoint controller” as setpoint source.

Select the “Signal type” after selecting the type of use:

After selecting the signal type, it is defined how standard values are used:

Defined standards for the transfer of the signal are used with “Use specifications”. Finally the setting of the analogue input is ended as setpoint sensor.

Select “User-defined settings” to configure additional settings:
Optional cable break detection is available for 0 – 10 V and 0 – 20 mA signal types only.

Select “Switched off” to switch off cable break detection.
Select “Switched on” to activate cable break detection only within an adjustable limit value.

Define limit value for cable break by turning the operating button and confirm by pressing it.

In the next step define whether

• the analogue signal only changes the setpoint
• and the pump is additionally switched off through the analogue signal.

A setpoint change can be done through analogue signals without switching on and off the pump through the signals. In this case, “Switched off” is selected.
If the “On/off by analogue signal” function is switched on, the limit values must be defined for the switch on/off.
Subsequently assign the MIN signal/value and MAX signal/value.

For the transfer of analogue signal values to setpoints, only the transfer ramp is now defined. For this purpose, the minimum and maximum support points of the characteristic curve are specified and the respective setpoints are amended (MIN signal/value assignment and MAX signal/value assignment).

When all signal/value assignments have been performed, the setting of the analogue setpoint source is completed.

An editor for adjusting the substitute setpoint in the event of a cable break or wrong configuration of the analogue input will open.

Select substitute setpoint. This setpoint is used when detecting a cable break at the external setpoint source.

Actual value sensor

The actual value sensor provides:

• Temperature sensor values for temperature-dependent control modes:
• Constant temperature
• Differential temperature
• Room temperature
• Temperature sensors values for temperature-dependent additional functions:
• Heating/cooling quantity measurement
• Automatic heating/cooling switchover
• Automatic detection of thermal disinfection
• Differential pressure sensor values for:
• Differential pressure control with index circuit actual value logging
• User-defined sensor values for:
• PID control

Possible signal types when selecting the analogue input as actual value input:

Actual value sensor signal types:

0 – 10 V: Voltage range of 0 – 10 V for transfer of measurement values.

2 – 10 V: Voltage range of 2 – 10 V for the transfer of measurement values. Cable break is detected for a voltage below 2 V.

0 – 20 mA: Electric current of 0 – 20 mA for transfer of measured values.

4 – 20 mA: Electric current range of 4 – 20 mA for transfer of measured values. A cable break is detected in case of electric current below 4 mA.

PT1000: The analogue input evaluates a PT1000 temperature sensor.

Actual value sensor configuration

First open the overview menu to view the current configuration and use of analogue input.

To do this, in the “Settings” menu, select

1. “External interfaces”
2. “Analogue input (AI1) function” or “Analogue input (AI2) function”
3. “Overview of the analogue input”.

Type of use, signal type and other set values for selected analogue input will be displayed. In order to make or change settings:

In the “Settings” menu, select

1. “External interfaces”
2. “Analogue input (AI1) function” or “Analogue input (AI2) function”
3. “Set analogue input”.

First select type of use:

Select one of the types of use “Differential pressure sensor”, “Temperature sensor” or “External sensor” as one of the usage types.

Select the “Signal type” after selecting the actual value sensor:

When selecting the signal type “PT1000”, all settings for the sensor input are completed and all other signal types require additional settings.

For the transfer of analogue signal values to actual values, only the transfer ramp is now defined. For this purpose, the minimum and maximum support point of the characteristic curve is specified and the respective actual values are amended (MIN signal/value assignment and MAX signal/value assignment).

Data input is complete, once the minimum and maximum characteristic curve interpolation points have been entered.

In the “Settings” menu, select

1. “External interfaces”
2. “Analogue input (AI1) function” or “Analogue input (AI2) function”
3. “Temperature correction” and set correction value (offset).

In the “Settings” menu, select

1. “External interfaces”
2. “Analogue input (AI1) function” or “Analogue input (AI2) function”
3. “Select the sensor position”.

The following positions are available:

• Internal sensor
• Analogue input 1
• Analogue input 2
• BMS
• Feed
• Return
• Primary circuit 1
• Primary circuit 2
• Secondary circuit 1
• Secondary circuit 2
• Accumulator
• Hall
• Circulation