NO.1 Overvoltage Protection:
The inverter has a voltage detection function at its output, which automatically adjusts the output voltage to prevent the motor from experiencing overvoltage. Even if the output voltage adjustment fails or the output voltage exceeds 110% of the normal voltage, the inverter will still protect the motor by shutting down.
NO.2 Undervoltage protection:
When the motor voltage drops below 90% of the normal voltage, the frequency converter will shut down for protection.
NO.3 Overcurrent Protection:
When the motor current exceeds 150% of the rated value for 3 seconds, or 200% of the rated current for 10 microseconds, the frequency converter will protect the motor by shutting down.
NO.4 Phase Loss Protection:
The inverter monitors the output voltage and alarms when a phase is lost. After a period of time, the inverter stops to protect the motor.
NO.5 Reverse protection:
The frequency converter allows the motor to rotate in only one direction and the rotation direction cannot be set. Unless the user changes the phase sequence of the motor's A, B, and C wiring, there is no possibility of phase reversal.
NO.6 Overload Protection:
The frequency converter monitors the motor current. When the motor current exceeds 120% of the rated current for 1 minute, the frequency converter will protect the motor by shutting down.
NO.7 Grounding protection:
The frequency converter is equipped with a dedicated grounding protection circuit, which typically consists of a grounding protection transformer and a relay. When one or two phases are grounded, the frequency converter will alarm. Of course, if the user requests, we can also design it to immediately shut down the unit after a ground fault.
NO.8 Short circuit protection:
When the inverter output is short-circuited, it will inevitably cause overcurrent. Within 10 microseconds, the inverter will stop to protect the motor.
NO.9 Overclocking Protection:
The frequency converter has maximum and minimum frequency limiting functions, which ensure that the output frequency can only be within the specified range, thereby realizing the over-frequency protection function.
NO.10 Stall Protection:
Stall protection is generally designed for synchronous motors. For asynchronous motors, stall during acceleration inevitably manifests as overcurrent, which the frequency converter addresses through overcurrent and overload protection. Stall during deceleration can be avoided by setting a safe deceleration time during commissioning.
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