Firmware Manual

9000X AF Drives
MN04004001E
For more information visit: www.eaton.com
7-7
August 2010
Pump and Fan Control Application
Examples
Pump and fan automatics with interlocks and no autochange
Situation: One controlled drive and three auxiliary drives.
Parameter settings: 1.9.1 = 3, 1.9.25 = 0
Interlock feedback signals used, autochange not used.
Parameter settings: 1.9.23 = 1, 1.9.24 = 0
The interlock feedback signals come from the digital inputs selected with
parameters 1.2.6.18 to 1.2.6.21.
The Auxiliary drive 1 control (par. 1.3.1.27) is enabled through Interlock 1
(par. 1.2.6.18), the Auxiliary drive 2 control (par. 1.3.1.28) through Interlock
2 (par. 1.2.6.19) etc.
Phases: 1) The system and the motor controlled by the frequency converter are
started.
2) The Auxiliary drive 1 starts when the main drive reaches the starting
frequency set (par. 1.9.2).
3) The main drive decreases speed down to Auxiliary drive 1 Stop frequency
(par. 1.9.3) and starts to rise toward the Start frequency of Auxiliary drive 2,
if needed.
4) The Auxiliary drive 2 starts when the main drive has reached the starting
frequency set (par. 1.9.4).
5) The Interlock feedback is removed from Aux. drive 2. Because the Aux.
drive 3 is unused, it will be started to replace the removed Aux. drive 2.
6) The main drive increases speed to maximum because no more auxiliary
drives are available.
7) The removed Aux. drive 2 is reconnected and placed last in the auxiliary
drive start order which now is 1-3-2. The main drive decreases speed to the
set Stop frequency. The auxiliary drive start order will be updated either
immediately or in the next Stop (autochange, sleep, stop, etc.) according to
par. 1.9.23.
8) If still more power is needed, the main drive speed rises up to the
maximum frequency placing 100% of the output power in the system’s
disposal.
When the need of power decreases, the auxiliary drives turn off in the opposite order
(2-3-1; after the update 3-2-1).