Pump Control Quick Guide
17
In the following, the requirements or conditions to activate an auxiliary pump are shown:
• Connection of an auxiliary pump
If the regulated pump’s output frequency is higher than the level established by J34 during the time
specified in J35, the inverter will understand that using the regulated pump is not enough to maintain the
required pressure, and the inverter is ready to connect an auxiliary pump to the commercial power supply.
When the condition above is accomplished, the inverter will decrease the output frequency of the
regulated pump to the value stored in J93, by means of the deceleration ramp in J39. Once the frequency
level J93 is achieved, the PID controller will be activated again.
The frequency level when the auxiliary pumps are connected is defined in function code J44.
J35 (sec)
J34 (Hz)
Figure 2.6: Auxiliary pump’s connection
The exact frequency level where the inverter connects the auxiliary pumps to the commercial power
supply is specified by means of the function code J44. The equation that defines this level is:
Frequency for the connection of the auxiliary pumps (Hz)
( )
191918
100
44
JJJ
J
+
−×=
As an example:
J44 = 50 %
J18 = 50 Hz
J19 = 25 Hz
Frequency for the connection of the auxiliary pumps (Hz)
( )
Hz5,37252550
100
50
=+
−×=
In this case, the connection of the auxiliary pumps happens when the regulated pump is turning at 37.5
Hz.
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