Fuji Electric FRENIC-Eco Series - Pump connection and disconnection to main supply

Pump Control Quick Guide 30
The following is an explanation of the requirements or conditions to connect a regulated
pump to the commercial power supply, and to disconnect a pump from the commercial power
supply:
• Connection of a regulated pump to the main supply
If the regulated pump’s output frequency rises above the level stored in J34 during the time established in
J35, the inverter will understand that the regulated pump is not enough to maintain the required pressure
and will get ready to connect the pump to the commercial power supply.
If the condition above is accomplished, the inverter will connect the regulated pump to the commercial
power supply and will take another pump of the system as a regulated one.
Figure 4.4: Connection of a regulated pump to the commercial power supply.
• Disconnection of a pump from the main supply
If the regulated pump’s output frequency decreases under the level established in function code J36
during the time J37, the inverter will understand that is not necessary to keep a pump connected to the
commercial power supply and will get ready for its disconnection.
If the condition above is accomplished, the inverter will increase the regulated pump’s output frequency
until the frequency stored in J94 using the acceleration time in J40. Once the frequency level achieves this,
the PID control will be activated.
This behaviour can be useful to reduce the possible sudden pressure fluctuations that may occur when a
pump is disconnected from the commercial power supply.