Honeywell SmartVFD HVAC MR4 User Manual page 158

HVAC A
PPLICATION
M3.14.4 A
UTOCHANGE
Selection Selection name
0 Disabled
1 Enabled
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
Description
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
priority/order is always restored after a stop.
The priority is changed at certain intervals to get an equal
wear on all motors. The intervals of the auto-change can
be changed (M3.14.5). You can also set a limit of how
many motors are allowed to run (M3.14.7)
maximum frequency of the regulating drive
the
autochange is done (M3.14.6). If the autochange interval
M3.14.5) 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 pressure
drops because of the system performing an autochange
when there is a high capacity demand at a pump station.
Honeywell
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