PLC and inverter system control instance analysis

1. Control requirements

if no fault in the inverter and no stop command console, after starting the command, the inverter will be in the order shown below process action, if there is no stop command is given, to run automatically after three cycles automatically stop; If the stop command is given on the way, will stop at the end of the cycle; If on inverter malfunction or stop command console given, will be immediately stopped.

frequency converter operation frequency will be displayed on the VW500. The inverter frequency is given by PLC controller is 0 10 v analog value is given.

VFD - M in inverter parameter Settings:

P00 = 01 P02 = 01 P17 = 10. 0 P18 = 25。 0 P19 = 40。 0 P43 = 00 other parameters to default values.

2。 Control program

program debugging explanation:

M0. 0 is starting marks when M0. 0 = 0 is to stop state, when M0. 0 = 1 is starting state.

S0。 Step 0 control inverter 10 hz is running at a speed.

S0。 Step 1 to control frequency converter with two speed 25 hz reverse running.

S0。 Step 2 control frequency converter with three speed 40 hz reverse running.

S0。 Step 3 control frequency converter is running at frequency speed, frequency VW500 given by PLC, VW500 numerical 0 (0 hz, VW500 numerical 32000 represents 60 hz.

S0。 Step 4 stop control frequency converter.

frequency converter operation frequency, by AIW0 acquisition to PLC, from VW502 reality. Run VW502 numerical 0 (0 hz, VW502 numerical 32000 represents 60 hz.

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