Control function

The control function of the controller is selected here. The following options are available:

  • Dynamic control valve
  • Differential pressure control *)
  • Flow temperature control
  • >>> Heating circuit outside temperature compensated flow temperature control <<<
  • Control valve for changeover

*)

Currently available exclusively for the 2-port valves EVG../EVF..

 

Setpoint source

The source of the setpoint for the selected control function is defined here.

For outside temperature-dependent flow temperature control, the source is fixed to "Analog (input X1)".

 

Input X1

The configuration of input X1 results from the selected control function and the setpoint source.

For the outside temperature-dependent flow temperature control, the input is fixed to "Outside temperature".

 

Signal type selection for X1

Several sensing elements are available as options for the signal type on input X1. In outside temperature-dependent flow temperature control, they are the following:

  • 0...10 V
  • Siemens LG-Ni1000 (e.g. Siemens QAC22)
  • Ni1000 (DIN)
  • Pt1000 (EU)

 

Output X2

For output X2, a calculated analog value can be selected from a list. The following options are available:

  • Primary flow temperature: 0…100 % (TFlPrim)
    • If this option is selected, the "Process value 2 for prim.flow temp.out" can be set (ABT Go: "Commissioning" > "Valve", 0…150 °C)
  • Primary return temperature: 0…100 % (TRtPrim)
    • If this option is selected, the "Process value 2 for prim.return temp.out" can be set (ABT Go: "Commissioning" > "Valve", 0…150 °C)
  • Flow/return temperature difference: 0…100 % (TDiffFlRt)
  • Relative volume flow: 0…100 %
  • Valve position: 0…100 % (VlvPosFb)
  • Relative power: 0…100 % of design power *)
  • Primary flow temperature setpoint output: 0…100 % (SpTFlPrimOut)
    • If this option is selected, two additional values can be set:
    • — "Process value 2 for primary flow temperature output" (ABT Go: "Commissioning" > "Heating control", 0…150 °C)
    • — "Setpoint increase for flow temperature" (ABT Go: "Commissioning" > "Heating control", 0…20 K)

*)

100 % = PwrDsgn

 

Signal type selection for X2

The following options are available for the signal type on output X2:

  • 0…10 V
  • 2…10 V
  • 4…20 mA

 

Input X3

Input X3 is fixed to "Secondary flow temperature" in outside temperature-dependent flow temperature control.

 

Signal type selection for X3 (secondary flow temperature sensor)

The following sensing elements are available as options for the signal type on input X3:

  • Siemens LG-Ni1000 (e.g. Siemens QAD22 or QAE2120)
  • Ni1000 (DIN)
  • Pt1000 (EU)
  • 0…10 V (e.g. Siemens QAE2164)
    • If this option is selected, the temperature range of the terminal value can be set within 0...10 °C (ABT Go: "Commissioning" > "Heating control" > "Process value 1 for flow temp.input" [-40...20  °C] / "Process value 2 for flow temp.input" [35...110 °C])

In this control function, Intelligent Valve configures input X3 for the secondary flow temperature measurement and operates the PI control circuit.

 

 

Related documents

Detailed information on commissioning with the ABT tools:

● Intelligent Valve Commissioning with ABT Go: A6V11422293

● Intelligent Valve Engineering / Commissioning in Desigo: A6V11572317