11.3.2. Synchronous operating principle.
If parameter COMBO synchrony is set to ON, synchronous operation is achieved. This operating mode provides
additional energy savings over cascade operation.
When water is required, a pump is started at variable speed according to the demand.
When the demand increases and the maximum frequency is reached, a second pump is started and the two pumps
run at the same speed to satisfy the water demand.
A further request leads to an increase in the frequency of the two pumps until, having reached their maximum
frequency, a third pump is started and so on.
In case of reduced demand, all the pumps of the unit reduce their frequency and, once reached the minimum
frequency, the pump that was started last switches off.
NOTE
To ensure correct synchronous operation, parameter Freq.min.control must be set appropriately, i.e.
two or three Hz above the working frequency at zero flow.
NOTE
If parameter Alternance is set to ON , the start priority of the pumps in COMBO mode is established
according to the operating hours, and parameter Altern. period establishes the number of hours of
continuous operation after which the pumps in the unit are forced to alternate.
11.3.3. Electrical connections.
S1+ S1- G
COMBO
MASTER: 0
S1+ S1- G
COMBO
SLAVE: 1 SLAVE: N
S1+ S1- G
COMBO
WARNING
Respect the polarity of the connections.
11.3.4. Programming the master unit.
Menu Parameter Value
Control. param. COMBO ON to activate.
Control. param. Address 00
Control. param. Alternance ON to activate / OFF to deactivate.
Control. param. Altern. period Establishes the number of hours of continuous operation after which the pumps in the
unit are forced to alternate. The value 0 means 5 minutes.
Control. param. COMBO synchrony ON to activate / OFF to deactivate.
Control. param. Start delay AUX We recommend setting 0 s.
VASCO - VAriable Speed COntroller
47
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