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5 Functional Description with Process Diagrams
5.4.3.2 I Term
The firing rate controller can use an actual current value (mA), the boiler temperature (°C, °F)
or the steam pressure (bar, psi) as the actual value for control. P 61 defines the unit of the
actual value.
For steam pressure, P 62 and P 63 are also required.
5.4.3.3 Constant Controller
If the firing rate controller is used as a constant control, its setpoint is obtained from the pa-
rameters
•
P 49 for setpoint 1
• P 51 for setpoint 2
P no. Description Attributes
61 Selection of the actual value input and the unit for indication (0-Digit; 1-°C; 2-bar; 3-mA; 4-
°F; 5-psi) V1.0.0.0
Selection of the unit in which the input for actual value is to be indicated
0 = Digit
1 = °C
2 = bar
3 = mA
4 = °F
5 = psi Write: 0/GUI/UI
Read: 0
Default: 2
Min: 0
Max:5
62 Pressure input: Scaling minimum V1.0.0.0
Pressure at 4 mA input current in 0,1 units (bar, psi).
Input of the lower limit of the display range, which corresponds to 4 mA at the input, if the
input is configured as pressure input.
This parameter can only be active if P 61 = 2
Example: Value = 100, is equal to a minimum pressure of 10,0 bar/psi Write: 1/GUI/UI
Read: 0
Default: 0
Min: 0
Max:999
63 Scaling maximum V1.0.0.0
Pressure at 20 mA input current in 0,1 units (bar, psi).
Input of the upper limit of the display range, which corresponds to 20 mA at the input, if the
input is configured as pressure input. This parameter can only be active if P 61 = 2
Example: Value= 500, is equal to a maximum pressure of 50,0 bar/psi Write: 1/GUI/UI
Read: 0
Default: 160
Min: 0
Max: 999
P no. Description Attributes
49 Controller 1 maximum value (only for control by atmospheric conditions) V1.0.0.0
Controller setpoint 1 max. for control by atmospheric conditions
Enter the setpoint maximum for the controller in °C or bar. The setting is active if the input
"Setpoint changeover" = 0. Write 0/GUI/UI
Read: 0
Default: 84
Min: -32768
Max: 32767
51 Controller 2 maximum value (only for control by atmospheric conditions) V1.0.0.0
Controller setpoint 2 maximum for control by atmospheric conditions
Enter the setpoint maximum for the controller in °C or bar. The setting is active if the input
"Setpoint changeover" = 1. Write: 0/GUI/UI
Read: 0
Default: 84
Min: -32768
Max: 32767