Specific method example of V20 frequency converter manual automatic switching (local remote switching)

V20 The frequency converter switches manually and automatically （ Local remote switching ） Examples of specific methods

A commonly used typical design is to control the start and stop of the frequency converter through the button of the electrical cabinet in the local mode , Adjust the frequency through the frequency converter panel ; Through... In remote mode PLC Of DO The output controls the start and stop of the frequency converter , In both modes, it passes through the inverter AO Output frequency feedback , Output operation feedback through intermediate relay .

Siemens V20 The converter has no macro in this mode , You need to set up your own , Specific methods can be referred to as follows ：

The design wiring mode is as follows ：
DI1： start-up / Stop control input
DI2： long-range / Local switching input
DO1： Operational feedback
DO2： Fault feedback
AI2： Remote frequency setting （4~20mA）
AO1： Frequency feedback （4~20mA）

The circuit diagram is as follows ,

The control requirements are as follows ：
Local control ：DI1 Control the start and stop of frequency conversion ,BOP Panel given frequency
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