Firmware Manual

9000X AF Drives
7-6 For more information visit: www.eaton.com
MN04004001E
August 2010
Pump and Fan Control Application
Parameters 1.9.27 — Maximum Number of Auxiliary Drives and
1.9.28 — Autochange Frequency Limit
These parameters define the level below which the capacity used must remain so that the
autochange can take place.
This level is defined as follows:
● If the number of running auxiliary drives is smaller than the value of parameter 1.9.27
the autochange function can take place.
● If the number of running auxiliary drives is equal to the value of parameter 1.9.27 and
the frequency of the controlled drive is below the value of parameter 1.9.28 the
autochange can take place.
● If the value of parameter 1.9.28 is 0.0 Hz, the autochange can take place only in rest
position (Stop and Sleep) regardless of the value of parameter 1.9.27.
Interlock Selection (P1.9.23)
This parameter is used to activate the interlock inputs. The interlocking signals come from
the motor switches. The signals (functions) are connected to digital inputs which are
programmed as interlock inputs using the corresponding parameters. The pump and fan
control automatics only control the motors with active interlock data.
● The interlock data can be used even when the Autochange function is not activated.
● If the interlock of an auxiliary drive is inactivated and another unused auxiliary drive
available, the latter will be put to use without stopping the frequency converter.
● If the interlock of the controlled drive is inactivated. all motors will be stopped and
re-started with the new setup.
● If the interlock is re-activated in Run status, the automatics functions according to
parameter 1.9.23, Interlock selection:
0 Not used
1 Update in stop
Interlocks are used. The new drive will be placed last in the autochange line without stopping
the system. However, if the autochange order now becomes, for example, [P1 ➔ P3 ➔ P4 ➔
P2], it will be updated in the next Stop (autochange, sleep, stop, etc.).
Example:
[P1 ➔ P3 ➔ P4] ➔ [P2 LOCKED] ➔ [P1 ➔ P3 ➔ P4 ➔ P2] ➔ [SLEEP] ➔ [P1 ➔ P2 ➔ P3 ➔ P4]
2 Stop & Update
Interlockings are used. The automatics will stop all motors immediately and re-start with a
new setup.
Example:
[P1 ➔ P2 ➔ P4] ➔ [P3 LOCKED] ➔ [STOP] ➔ [P1 ➔ P2 ➔ P3 ➔ P4]
See Page 7-7 Examples.