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Page 54
Vacon
Pump and fan control with autochange
9. 29
Autochange level, auxiliary drives
9. 30
Autochange level, variable speed drive frequency
These parameters define the level below which the used capacity must be when
the autochange happens.
* If the number of running auxiliary drives is less than the value of the parameter
9.29 the autochange can happen.
* If the number of running auxiliary drives is equal to par. 9.29 and the frequency
of the variable speed drive is less than the value of parameter 9.30 the
autochange can happen.
* If the parameter 9.30 = 0,0 Hz then the autochange can happen only in sleep
or stop state in spite of the value of parameter 9.29.
Kuva 6-35 Autochange interval and level
vuorot3.fh3
Time
Output
frequency
Par. 9.28
Par. 9.28
Autochange interval
Par. 9.30
Autochange
level, frequency
Autochange interval
Autochange moment
Aux. drive 1
control
Aux. drive 2
control
Par. 9.29 = 1
Autochange level,
auxiliary drives