252 Parameters
76.09 Start order corr Whenever the application requires more pumping volume,
additional drives are started. The starting order is dependent
on the priority setting of the drive (parameters
76.04…76.06). Whenever several drives have the same
priority, the one with the lowest node number (parameter
76.02) is started first by default.
The Autochange function can be used to automatically rotate
the starting order within each priority group. Drives running
before the Autochange may continue to run so that the new
starting order cannot be applied immediately; this parameter
defines the method with which the drive order of priority is
corrected.
Example:
One pump is running. If necessary, additional pumps are
started in the following order:
While there is constant flow demand (and a pump must be
running), the Autochange function is activated, rotating the
starting order within each priority. After Autochange, the
order is as follows:
The desired order, however, is this:
The selections of this parameter define how the desired
order is achieved.
Optimal Drive order of priority is corrected only when the number of
drives needs to be increased or decreased by the master as
required by the process.
0
Instant chng Drive order of priority is corrected as soon as a new starting
order is generated, for example when the Autochange
conditions are met. The order is corrected by stopping low-
priority drives. Higher-priority drives are then started as
required by the process.
1
76.10 Master location Defines whether the master status is passed on with each
started drive or not.
Stable The first drive started will remain the master as long as
possible, until, for example, the drive is no longer allowed to
be master (by parameter 76.03 Master enable), or the drive
trips on a fault.
0
No. Name/Value Description FbEq
ID: 1
Priority: 1
ID: 2
Priority: 1
ID: 3
Priority: 2
ID: 4
Priority: 2
+++
Running
Flow demand
ID: 2
Priority: 1
ID: 1
Priority: 1
ID: 4
Priority: 2
ID: 2
Priority: 2
+++
Running
Flow demand
ID: 2
Priority: 1
ID: 1
Priority: 1
ID: 4
Priority: 2
ID: 2
Priority: 2
+++
Flow demand
Running
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