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 |
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 |