Safety protection

The inverter has a protection circuit inside, which can realize various abnormal protection functions for itself and the load motor, including overheating (overload) protection and anti-stall protection.

(1) Overheating (overload) protection function

The overheat protection (overload) protection of the inverter is overcurrent protection. Electronic thermal protection is implemented in all inverters or protected by thermal relays. The overheating (overload) protection function is to monitor the temperature of the load motor and the inverter itself. When the inertia of the load controlled by the inverter is too large or the motor is blocked due to excessive load, the output current exceeds the rated value or the AC motor overheats. The circuit acts to stop the motor and prevent damage to the inverter and the load motor.

(2) Anti-stall protection

Stall means that when the given acceleration time is too short and the motor acceleration change is far behind the change of the inverter's output frequency, the inverter will over-current and trip, and the operation will stop.

In order to prevent the above-mentioned stall phenomenon from causing the motor to operate normally, the inverter is internally provided with an anti-stall protection circuit, which can detect the magnitude of the current for frequency control. When the acceleration current is too large, the acceleration rate is appropriately slowed down. When the deceleration current is too large, the deceleration rate is also appropriately slowed to prevent the stall condition.

In addition, the protection circuit in the inverter can realize overcurrent short circuit protection, over voltage protection, cooling fan overheating and instantaneous power failure protection during operation. When the abnormal state is detected, the internal circuit shutdown protection can be controlled.

The protection functions of the inverter are generally perfect. In addition to the above two basic protection functions, basic protection against ground short circuit protection, over voltage protection, under voltage protection, input phase loss protection, instantaneous power failure protection, motor protection, etc. Features.