Vacon 100 INDUSTRIAL Applications Manual - page 72
VACON HVAC Drive Application
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3
P3.14.4
EXAMPLE:
In the autochange sequence after the autochange has taken place, the motor with the highest
priority is placed last and the others are moved up by one place:
Starting order/priority of motors: 1->2->3->4->5
--> Autochange -->
Starting order/priority of motors: 2->3->4->5->1
--> Autochange -->
Starting order/priority of motors: 3->4->5->1->2
Selection
Selection name
Description
0
Disabled
The priority/starting order of the motors is always 1-
2-3-4-5 in normal operation. It might have changed
during run if interlocks have been removed and
added again, but the priority/order is always restored
after a stop.
1
Enabled
The priority is changed at certain intervals to get an
equal wear on all motors. The intervals of the auto-
change can be changed (P3.14.5). You can also set a
limit of how many motors are allowed to run
(P3.14.7) as well as for the maximum frequency of the
regulating drive when the autochange is done
(P3.14.6). If the autochange interval P3.14.5) has
expired, but the frequency and motor limits are not
fulfilled, the autochange will be postponed until all
conditions are met (this is to avoid e.g. sudden pres-
sure drops because of the system performing an
autochange when there is a high capacity demand at
a pump station.