I want to build a variable frequency control cabinet; I’m seeking advice from experts
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I want to build a variable-frequency control cabinet for use in maintaining a constant water pressure in water pumps. I’m seeking advice from experts – are there any circuit diagrams or similar resources I can refer to?
It’s better to transfer you to the electrical department for better communication
The question is unclear. The frequency converter already has a speed control function – why do you still need to control the frequency conversion cabinet?
What size motor? Taking ABB as an example, the water supply pumps represent cubic-load applications, which are considered heavy-duty loads. The selection of the low-voltage inverter is based on the motor current; inverters with a capacity of 300A or more are used in cabinet-mounted systems, where an electrical control cabinet is used to drive the motor. The standard circuit diagrams for the required components can be found in the user manual. The most common inputs include those for forward/reverse operation, emergency stop, and speed control. The DO can operate in normal mode or in fault mode; a brake clutch is used. The input side consists of three phases connected via circuit breakers, while the output side is connected directly to the motor. For two or more motors, a thermal overload relay is used.