Modulating setpoint control

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