Explain how to cooperate between frequency converter and PLC control -

by:Coolmay     2020-06-05
One spoken in front of the PLC control frequency converter application modes: running commands terminal channel + terminals analog channel. Typical applications of this model is in constant pressure water supply, the use of remote transmission line pressure manometer detection detection, converted to 0 Or 4-10 v voltage 20 ma current analog feedback to the PLC, through the PLC controller PID arithmetic, and then into analog output operation results, using frequency converter to the terminals analog input channel control frequency inverter to adjust water pump speed, constant pressure water supply control of closed-loop adjustment, thus formed the diagram below:

we V20 Siemens inverter, for example, to explain how to cooperate between frequency converter and PLC control. Because PLC standard without analog input and output functions, so choose a analog input/output module EMAM06 extensions, wiring diagram is as follows:

0 +, 0 For analog input interface, 1 m, 1 for analog output interface, DI1 V20 digital input terminals, connected to the PLC output point, Q0. 0 is used to control the inverter start-stop, DIC for digital input public side, the negative figure in the 24 v power supply.

then inverter how to set parameters to cooperate?

before the debug parameter to restore the factory default frequency converter operation, the method is as follows:

parameter feature set P0003 user access level = 1 ( Standard user access level) P0010 debug parameter = 30 ( Factory Settings) P0970 factory reset = 21: reset to factory default parameter Settings and remove the user default Settings ( If stored)

accessibility P0003 V20 set the parameters, the level must be changed to experts can only access all the application parameters, as follows:

P0003 user access level 0 user-defined parameter list 1 standard: 23 experts to allow access to commonly used parameters: only for the use of expert maintenance: only for the use of the authorized maintenance personnel, password-protected

set start-stop command source for external terminal control P0700 method is as follows:

P0700 [ 0. 。 。 2] The source command source selection digital quantity orders. 0 1 operation panel (factory default Settings The keyboard) 2 terminal 5 on the USS/MODBUS rs485

set the function of the external input terminals P0701 to P0704 method is as follows:

P0701 - P0714 digital quantity input terminals function 0 ban digital quantity input on/reverse/OFF13OFF2 OFF12ON - 1 According to the inertia 4 off3 - free parking Rapid decline in slope parking on 5 / OFF2 command 9 10 forward 11 at reverse fault confirmed 12 reversal at 13 mop ( Electric potentiometer) Acc ( Increase the frequency) 14 the mop slow down, Reduce the frequency) 15 fixed frequency selector 016 fixed frequency selector 117 fixed frequency selector 218 fixed frequency selector 322 quick stop command source 123 quick parking command source 224 quick 25 dc brake override can make 27 pid can make 29 external tripping 33 prohibit additional frequency value 99 bico parameters setting enabled

Settings P0727 line type, as follows:

parameters P0727 Siemens standard control function 0 Start/direction) 12 line control ( Forward/reverse) 23 line control ( Forward/reverse) 33 line control ( Start/direction

choose P1000 set frequency setting, as follows:

parameter selection 0 unowned P1000 frequency setting value 1 MOP set point 2 on the analog value 3 fixed frequency 5 rs485 USS/MODBUS7 analog value 210 is the main value + 11 MOP MOP set data set value + MOP MOP setpoint value analog value of 12 + 13 fixed frequency + MOP set value on the USS/MODBUS rs485 15 + 17 analog value 2 + MOP MOP set data set value 20 no 21 MOP set data + value + analog value analog value and analog value + 23 fixed frequency analog value + analog value 25 on the USS/MODBUS rs485 + analog value and analog value 2 + 30 unowned analog value set data, fixed frequency

macro can be used to realize fast debugging, the system provides several commonly used macro, as shown below, specific parameter Settings, please refer to each macro V20 manual.

connection macro description Cn000 factory default Settings. Don't change any parameter Settings. Cn001BOP panel control as the sole source Cn002 through terminal control ( PNP / NPN型) Cn003 fixed speed Cn004 binary mode of fixed speed Cn005 analog input and fixed frequency Cn006 external Cn007 external button button control combined with analog value Cn008PID control combined with analog input reference Cn009PID control combined with fixed value reference Cn010USS Cn011MODBUS RTU control

connection macro method is as follows:

choose to connect the corresponding macro, if do not conform to the requirements of the control of individual parameters, manually modify once again can.

then write control program, the first piece of hardware system configuration Settings, as follows:

to PID guide configuration method is as follows:

after the written procedures can be found through the guide block p loop gain, integral time, I D differential time address, adjusted by changing the value of PID parameter must be set to keep power type. As shown in the figure below:

can also be adjusted by software provides PID panel, make the adjustment more intuitive, as shown in the figure below:

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