The control of the inverter is nothing more than starting, aborting, forward rotation, rotation, speed regulation, these fundamental logics require that the level condition is effective, not the rising edge is effective, so the use of button switch to control the inverter, the general need to use the self-protection mode of the button switch to finish, if not the self-protection mode, the need for other plus the center relay to do self-protection.
1. Single switch start and stop
When the switch is disconnected, the RUN terminal becomes low, and the inverter stops running.
In this case, the use of a self-protection button switch can meet the start and stop control of the inverter, an extra switch, can be used to do fault reset, connected to the RST, of course, it is more ideal to use a non-insistent switch, when the inverter is faulty, press the reset switch, you can clear the fault of the inverter. Since there is no separate potentiometer given, it is possible to pass through the operation panel to give a given frequency.
Of course, the above logic can also be completed by a logic manipulator such as a PLC.
2. The double switch realizes positive rotation start and stop
In some cases, it is necessary to control the positive rotation of the inverter, and although the communication 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, if 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 aborted.
Similarly, when another switch is connected to the rotary terminal of the inverter (some are REV, here 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 same frequency value of the inverter can be given through the panel.
3. One switch controls the start and stop, and the other controls the speed
The above has now talked about a switch to control the inverter start and stop situation, 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 through the internal parameters of the multi-function terminal, can set a switch to jog mode, so that through this switch can control the inverter to work in the jog condition, the inverter will often run at 5% speed, of course, this value can also be corrected by the panel.
It can also be given using a multi-speed utility port or UP/DOWN, and the substance and jog form 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 use and debugging of the inverter in practice, it is far more than the five fundamental logics of starting, stopping, forward rotation, rotation and speed regulation in the text.
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