The control of the inverter is nothing more than the basic logic of starting, aborting, forward rotation, rotation and speed regulation, which basically requires that the level condition is useful, rather than the rising margin, so the use of button switches to control the inverter is generally required to use the self-protection form of the button switch to finish, if it is not the form of self-protection, it is necessary to add other intermediate relays to do self-protection.
1. Single switch start and stop
When the switch is disconnected, it is equivalent to the RUN terminal becoming low, and the inverter stops running.
In this case, the use of a self-protection button switch can be satisfied with the start and stop control of the inverter, an extra switch, can be used to do fault reset, connected to the RST, of course, with a non-insistent switch more ambitious, when the inverter has a problem, press the reset switch, you can clear the fault of the inverter. Since there is no separate potentiometer given, the frequency can be given by passing through the operation panel.
Of course, the above logic can also be completed by a logic manipulator such as a PLC.
2. The double switch completes the positive rotation start and stop
In some occasions, it is necessary to control the positive rotation of the inverter, and although the AC asynchronous motor can rotate any two phase lines at the output of the inverter, it is more laborious and laborious to operate, and the inverter has the function of direct start control of rotation.
For example, a switch is connected to the forward terminal of the inverter (some are FWD, here is DI1), then the sub-inverter will rotate forward, and the switch must of course choose the insistent type, when the switch is disconnected, the inverter will be directly stopped.
Similarly, when another switch is connected to the rotary terminal of the inverter (some are REV, here is DI2), then the sub-inverter will be anyway, the switch is the same insistence, when the switch is disconnected, the inverter will stop running.
If there is no external potentiometer, the frequency value of the inverter can be given through the panel.
3. A switch controls the start and stop,
The other one is given a control speed
The above has mentioned that a switch controls the start and stop of the inverter, and another switch can actually be used to do a given speed, *** simple, such as jog control, some inverters, especially the European system, can be set to multi-function terminals through internal parameters, and a switch can be set to a jog form, so that the inverter can be controlled to work in the jog condition through this switch, and the inverter will often run at a speed of 5% in the jog condition, of course, this value can also be corrected by other panels.
It can also be given using the multi-speed utility port or UP/DOWN, and the substance and jog mode are the same. If the inverter does not act, as long as the corresponding I/O port is measured by the multimeter to determine whether the level signal is normal, you can know whether the line is connected correctly, and then the corresponding manual is to set the function of the port.
However, in the application and debugging of the inverter in practice, it is far more than the five basic logics of starting, stopping, forward, rotating and speed regulating in the text.
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