After release of “Stage1Cmd” the “SetpointOutput” output will be released. In this situation the “SetpointOutput” output signal represents the compensated setpoint which, most of the times, is sent as a voltage signal to the external boiler burner control equipment (the point’s output characteristic can linear graph: 0…100% = 0…10 Volts or 0…100% = 2…10 Volts). The low and high setpoint output limits are respectively defined by parameter SPO-02 to SPO-05. The conversion from the compensated setpoint to the “SetpointOutput” output signal is shown in next figure.
The heat generator receives the setpoint from the strategy via a global register.
Fig. 5. Modulating setpoint control
Table 11. Parameter List
Description |
Value Range |
Default Value |
Unit |
SPO-02: setpoint low input |
0...500 |
10 |
°C |
SPO-03: setpoint high input |
0...500 |
90 |
°C |
SPO-04: setpoint low output |
0...500 |
20 |
°C |
SPO-05: setpoint high output |
0...500 |
90 |
°C |