Beef jerky continuous vacuum packing electrical control system of the commonly used protection

beef jerky continuous vacuum packing electrical control system of the commonly used protection link. Continuous vacuum packaging machine and dried beef jerky stretch film packaging machine, in the process of work, beef jerky stretch film packaging machine in order to keep the electric drive control system of the motor and all kinds of electrical and control circuit can normal operation, reduce the possibility of harmful factors, and in case of electrical failure, failure was reduced to a smaller range as far as possible, in order to ensure personal and equipment protection, so we need the protection of the electrical control system, set up necessary link. Beef jerky commonly used protection link has over current protection, overload protection, short circuit protection, over voltage protection, voltage protection, open phase protection, weak magnetic loss protection and accelerating protection, etc. Then look at together.



beef jerky continuous vacuum packing electrical control system of the commonly used protection link. Beef jerky continuous vacuum packaging machine electrical components in normal work, through the current within the rated current. In a short period of time, as long as the temperature rise allowed, also can be more than rated current, this is all sorts of electrical equipment or components according to its insulation condition is different, but load ability. Current protection is to protect the basic principle of electric testing signal after transformation or zoom in to control the protected object, when the reach setting value, protection appliances. Current type mainly has overcurrent, overload protection, short circuit and several phase.

a, short circuit protection,

beef jerky continuous vacuum packing electrical control system of the commonly used protection link. When the motor winding and insulation of the wire is damaged, or failure control appliances and circuit to damage, line will appear short circuit phenomenon, produce a lot of short circuit current, up to several dozen times the rated current, make the motor, electric appliances, wire and other electrical equipment damage, so in the case of short circuit fault, protection appliances need immediate action, quickly cut off the power supply common short-circuit protection appliances is fuses and circuit breakers. The fuse melts and protected circuit in series, when the normal work of the circuit, the fuse melts doesn't work. When short circuit, a lot of short circuit current flows through the melt, the melt fuse, immediately cut off the motor power. Similarly, if in the circuit connected to the automatic air circuit breaker, when a short circuit, circuit breaker action immediately, to cut off the power to make the motor stalling.



2, overload protection,

beef jerky continuous vacuum packing electrical control system of the commonly used protection link. When beef jerky continuous vacuum packaging machinery motor load is too big, start operation is frequent or lack of phase operation, can make the working current of the motor for a long time more than the rated current, motor winding overheating, temperature rise more than the allowable values, lead to the insulation of the motor brittle, shorten the life, will make the motor damage. Therefore, when the motor overload protection appliances should be action, cut off the power to make motor stalling, avoid rabbit motor under overload operation.

common overload protection appliance is a thermal relay. When the working current is equal to the rated current of the motor, thermal relay, the normal work of the motor; Short-time overload or overload current when the motor is small, thermal relay action, or no time to action: when motor overload current is larger, thermal relay action, has cut off the control circuit and main circuit of power supply, make the motor stalling, figure 34 is used in the thermal relay overload protection.

for motor open phase protection, can be used with open phase protection of thermal relay to achieve overload protection. For three-phase asynchronous motor, usually to be short circuit protection and overload protection.

3, open phase protection

beef jerky continuous vacuum packing electrical control system of the commonly used protection link. Beef jerky continuous vacuum packaging machine in fault occurs, the power of the three-phase asynchronous motor sometimes appear open phase, if there is a two phase electric disconnect, electric motor, as long as pay attention to prevent to get an electric shock accident, usually there is no danger. Electrical disconnect, but if only one phase motor can run, but the output torque of the motor is small, the runtime accident prone to burning motor, thus to open phase protection.



4, over current, low current protection

beef jerky continuous vacuum packing electrical control system of the commonly used protection link. Beef jerky continuous vacuum packaging machine overcurrent protection is different from a current type protection of short circuit protection. Over current, refers to the motor or electrical components exceed its rated current operation state, it usually smaller than the short circuit current and no more than six times the rated current. In the case of overcurrent, electrical components are not damaged immediately, as long as before the temperature rise allowed by larger current value can resume normal, still allowed, but excessive impact load can make the motor through the impact of excessive current, so that damage the motor. Too much at the same time, the electromagnetic torque of the motor also can make the mechanical transmission parts damaged, so be instantaneous cut off power supply. The possibility of eddy currents in the operation of the motor in the larger than the short circuit occurs, particularly in the frequent startup and positive/reversal, repeated short-term work especially in the motor.
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