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Page 46
Vacon
Pump and fan control with autochange
9. 12
Reference step after start of the auxiliary drive 1
9. 13
Reference step after start of the auxiliary drive 2
9. 14
Reference step after start of the auxiliary drive 3
9. 15
Reference step after start of the auxiliary drive 4
The reference step will be automatically added to the reference value always when
the corresponding auxiliary drive is started. With the reference steps e.g. the pressure
loss in the piping caused by the increased flow can be compensated. See figure 6-
27.
Time
Reference for PI-controller
Reference
(analoginput)
Reference step 1
par. 9.12
Reference step 2
par. 9.13
Reference step 3
par. 9.14
Aux. drive 1
start
stop
start
stop
Aux. drive 2
Aux. drive 3
start
stop
Figure 6-27 Reference steps after starting auxiliary drives.