Connecting a Frequency Converter for Regulating the Performance of Sewage Pump Systems
In this article, we will discuss the connection scheme of a frequency converter for controlling sewage pumping systems.

Control of Sewage Pumping Stations (for Micro Drive FC 51 series)
Parameter Code |
Parameter Name |
Parameter Value |
0-10 |
Active Set |
[9] Multi Set-up - working with multiple parameter sets |
Settings for the first parameter set (automatic mode) |
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Perform preliminary settings as per the section "Initial Parameter Setting of the Frequency Converter and Basic Parameters" (pages 50–51) |
3-02 |
Min Setpoint |
[0] min working level or min signal level from the sensor (see sensor labeling) |
3-03 |
Max Setpoint |
[10] max working level or max signal level from the sensor (see sensor labeling) |
3-15 |
Setpoint Source 1 |
[0] No function – no (not used, otherwise the speed setpoint will be the total of setpoints from sources 3-10, 3-15, and 3-16) |
3-16* |
Setpoint Source 2 |
[0] No function – no (not used, otherwise the speed setpoint will be the total of setpoints from sources 3-10, 3-15, and 3-16) |
5-12* |
Digital Input Function Terminal 27 |
[2] – coast inverse – not used (otherwise by factory settings the runaway function is inverse – i.e., when there is no signal at terminal 27, the mechanism runs out (start command is ignored)) |
5-11* |
Digital Input Function Terminal 19 |
[23] – set up select bit 0 – selecting parameters for automatic/manual modes |
5-40 |
Green Light |
indicates that power is supplied to the frequency converter and it is ready for operation/operating |
1-00* |
Configuration Mode |
[3] Process – mode of the PI controller |
7-20* |
OS Source for PI Control (for VLT Micro Drive) |
[2] Analog input 60 – analog input terminal 60 |
7-30 |
Normal/inverse mode of operation of the controller |
[0] normal (the speed of the mechanism is higher with + error (setpoint – signal from the sensor) (pressure)) |
7-33* |
Proportional Coefficient of PI Regulation |
[1] – adjustable for application |
7-34* |
Integral Coefficient of PI Regulation |
[8] – adjustable for application |
3-100* |
Setpoint |
Setpoint % from 3-03 – setpoint for support level in % from the maximum value |
* Be sure to input/check the values of these parameters.