1. Overvoltage maintenance
The output of the motor inverter has the function of voltage detection, and the inverter can actively adjust the output voltage so that the motor does not bear the overvoltage. Even if the output voltage adjustment fails and the output voltage exceeds 110% of the normal voltage, the inverter will be shut down to maintain the motor.
2. Undervoltage maintenance
When the voltage of the motor is lower than 90% of the normal voltage, the inverter maintenance is shut down.
3. Overcurrent maintenance
When the current of the motor exceeds 150%/3 seconds of the rated value, or 200%/10 microseconds of the rated current, the inverter stops to maintain the motor.
4. Phase loss maintenance
The output voltage is monitored, and when the output is out of phase, the inverter alarms, and after a period of time, the inverter is shut down to maintain the motor.
5. Inverted maintenance
The inverter makes the motor can only rotate in one direction, and the direction of rotation cannot be set, unless the user changes the phase sequence of the motor A, B, and C wiring, otherwise there is no possibility of inverting.
6. Overload maintenance
The inverter monitors the motor current, and when the motor current exceeds 120%/1 minute of the rated current, the inverter stops to maintain the motor.
7. Grounding maintenance
The inverter is equipped with a special grounding maintenance circuit, which is generally composed of a grounding maintenance transformer and a relay, and the inverter will alarm when one or two phases are grounded. Of course, if requested by the user, we can also plan for immediate maintenance shutdown after grounding.
8. Short circuit maintenance
When the output of the inverter is short-circuited, it must cause an overcurrent, and within 10 microseconds, the inverter will be shut down to maintain the motor.
9. Overclocking maintenance
The inverter has the function of maximum and minimum frequency constraint, so that the output frequency can only be within the regular range, so as to complete the overclocking maintenance function.
10. Stall maintenance
Stall maintenance is generally for synchronous motors. For asynchronous motors, the stall in the acceleration process must be manifested as overcurrent, and the inverter completes this maintenance function through overcurrent and overload maintenance. Stall during deceleration can be prevented by setting a safe deceleration time during commissioning.
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