Connecting the frequency converter part 10

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.

image_alt_vfd

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)

 

 

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.