Menu Parameter Value
Control. param. Compensation This parameter is set other than 0 if you intend to operate a proportional differential
pressure control. Additional energy savings may be achieved through this type of
control.
The pressure difference that you want to keep constant at Max motor freq. is given by
the sum of parameters Set value + Compensation.
The pressure difference that you want to keep constant at Min motor freq. corre-
sponds to Set value .
The pressure set then varies proportionally between Min motor freq. and Max motor
freq..
1: Compensation; 2: System curve; 3: Proportional differential pressure; 4: Constant
differential pressure
Control. param. Freq.min.control Same as Min motor freq.
Control. param. Stop delay 99 s
Control. param. Start delay AUX In twin circulation systems (two pumps), each controlled by an inverter in COMBO
mode, this parameter should be set to 99 s in order to activate only one pump at a
time while ensuring the alternation of the same.
13. Alarms
When an alarm occurs, the device starts emitting an acoustic signal (if available) and an intermittent warning ap-
pears on the STATUS screen indicating the corresponding alarm. By pressing the STOP key (only and exclusively
in correspondence with the STATUS screen) it is possible to attempt to reset the machine. If the cause of the alarm
has not been resolved, the device displays the alarm again and emits an acoustic signal.
WARNING
Immediate remedies must be implemented in case of alarms to safeguard the integrity of the device
itself and of the system in which it is installed.
Alarm Description Possible solutions
LINE<->MOT INV. Reverse the connection of the power
cable and motor cable.
• Correct the connection of the power and motor cables.
VASCO - VAriable Speed COntroller
50
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