Eaton SLX9000 - Figure 9-36: Autochange Interval and Limits

SLX9000 Adjustable Frequency Drives User Manual
9-48 For more information visit: www.eaton.com
MN04003020E
January 2009
Figure 9-36: Autochange Interval and Limits
2.10.5 Autochange interval ID1029
After the time defined with this parameter, the autochange function takes place if the
capacity used lies below the level defined with parameters 2.10.7 (Autochange
frequency limit) and 2.10.6 (Maximum number of auxiliary drives). Should the
capacity exceed the value of P2.10.7, the autochange will not take place before the
capacity goes below this limit.
● The time count is activated only if the Start/Stop request is active. The time
count is reset after the autochange has taken place or on removal of Start
request.
● The time count is reset after the autochange has taken place or on removal of
Start request.
2.10.6
2.10.7
Maximum number of auxiliary drives
Autochange frequency limit
ID1030
ID1031
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 2.10.6, the autochange function can take place.
● If the number of running auxiliary drives is equal to the value of parameter
2.10.6 and the frequency of the controlled drive is below the value of
parameter 2.10.7, the autochange can take place.
● If the value of parameter 2.10.7 is 0.0 Hz, the autochange can take place only in
rest position (Stop and Sleep) regardless of the value of parameter 2.10.6.
2.10.8 Start frequency, auxiliary drive 1 ID1002
The frequency of the drive controlled by the drive must exceed the limit defined with
these parameters with 1 Hz before the auxiliary drive is started. The 1 Hz overdraft
makes a hysteresis to avoid unnecessary starts and stops. See also parameters 2.1.1
and 2.1.2.
Par. ID1030
=
1
Max. Number of
Auxiliary Drives
Autochange
Moment
Aux. Drive
2 Control
Output
Frequency
Time
Aux. Drive
1 Control
Par. ID1029
Autochange Interval
Par. ID1031
Autochange
Level,
Frequency
Par. ID1029
Autochange Interval