The inverter from what respect to protection on the motor

Abstract:the frequency converter is widely used in various industries,mainly due to its energy saving and the function of the frequency control of motor speed in the working condition of equipment and system application,the frequency converter from what respect to the protection of motor? Tags:frequency control,frequency converter,motor,energy-saving frequency converter is widely applied in industry control engineering net all rights reserved,mainly due to its energy saving and the function of the frequency control of motor speed in the working condition of equipment and system application,so the inverter is from what respect to the protection of motor? Below we will analyze this problem solve.Frequency converter for motor protection mainly has the following several aspects:over voltage protection,low voltage protection,over current protection,open phase protection,reverse phase protection,overload protection,earthing protection,short circuit protection,overclocking protection and protection of the stall.

Here are the several types of the frequency converter for motor protection method were introduced simply.1.The over voltage protection:the inverter output voltage detection function,frequency converter can automatically adjust the output voltage,the motor is not withstand overvoltage.Even if the output voltage and output voltage adjustment by more rotor and stator than 110% of the normal voltage,electric motor cooling fan frequency converter can also through the outage protection for motor.2.The under voltage protection:when the voltage is less than 90% of the normal voltage of the motor,frequency converter to protect downtime.3.The over current protection:when the motor current by more than 150% of the rating / 3 seconds,or 200% of the rated current / 10 microseconds,frequency converter through the downtime to protect the motor.4.Open phase protection:monitoring the output voltage,when the output phase,frequency converter alarm,after a period of time frequency converter through the downtime to protect the motor.5.Reverse protection:frequency converter motor can only rotate along one direction,unable to set the direction of rotation,unless the user changes motor wiring A,B,C phase sequence,there is no reverse phase.

6.Overload protection:monitoring frequency converter motor current,when the motor current is more than 120% of the rated current / 1 minute,the frequency converter via down to protect the motor.7.Grounding protection:frequency converter is equipped with special grounding protection circuit,generally made up of earthing protection of the transformer and relay,when a phase or two phase ground,inverter alarm.If the user requirements,of course,we can also design for the grounding protection immediately after downtime.8.Short circuit protection:after the inverter output short circuit,inevitably cause over-current,within 10 microseconds inverter through down to protect the motor.9.Overclocking protection:frequency converter has a maximum and minimum frequency limit function,make the output frequency can only be within the prescribed scope,thus realizing the overclocking protection function.10.Stalling protection:general for synchronous motor stalling protection.For asynchronous motor CONTROL ENGINEERING China all rights reserved,accelerate the process of stall will be performance for current,frequency converter by over current and overload protection to realize the protection function.Reduction in the process of stall can be set in the process of debugging to avoid safety deceleration time.