Fan stage switching

The fan starts with a delay defined by parameter STx-01: delay from off to low speed - when the following conditions are true:


The "FanStageCmd" input (FSC), defines the stage 1 or stage 2 position. You can connect the FSC input to the:


Depending on the fan speed signal, the changeover from low to high speed and from high to low speed is delayed as defined by parameters STx-01, STx-02 and STx-03. Next figure shows the timing diagram when SYS-01 = 0 (serial connection).



Description

Default value

SYS-01: serial/ parallel contacts ST1/ST2

0 = serial

1 = parallel

0

STx-01: delay from off to low speed

5 sec

STx-02: delay from low to high speed

30 sec

STx-03: delay from high to low speed

30 sec


Manual mode

The input "EffManSwCmd_MSt" has a higher priority than the input "FanSpeedControl".

The following table shows the described functions.


EffManSwCmd_MSt

FanCmd

FanSpeedControl

NextFanEnable

1

0

0

0

2

1

stage 1

1

3

1

stage 2

1

4/ 5

automatic

automatic

automatic