Stretch film packaging mechanical and electrical voltage protection.
As one of the automatic vacuum
packaging machine stretch film
packaging machine, its internal motor or electrical components are working under a rated voltage, the voltage is too high, too low or the human element in the process of work suddenly loses power, may cause damage to equipment or personnel casualties, so in the electrical control circuit design, according to the actual requirements, set up protection, overvoltage protection and pressure loss under voltage protection.
1.
Stretch film packaging electrical voltage protection of zero voltage, low voltage protection
stretch film packaging mechanical and electrical voltage protection.
Stretch film vacuum packaging machine in case of power grid at work all of a sudden power failure, the motor will halt, also will stop production of mechanical moving parts.
Usually operators can't timely pull open the power switch, if nothing is done, when the stretch film vacuum packaging mechanical and electrical source voltage returns to normal, the motor will start on its own, is likely to cause operators and equipment accidents, and the power over current and the instantaneous network voltage drop.
So you need to take the zero voltage protection measures.
in the electric control tensile membrane vacuum packing line, zero voltage by contactor and intermediate relay protection.
When grid power outages, contactor and intermediate relay current disappeared, contactor reset, to cut off the main circuit and control circuit power supply.
when stretch film packaging mechanical and electrical source voltage returns to normal, if not to press the start button, the motor will not start on its own, and zero voltage protection when grid voltage, the motor will run under the under voltage, motor speed dropped, the stator winding current is added.
Because there isn't enough amplitude current is added to make the fuse and thermal relay action, offered no protection, so these two kinds of electrical appliances if not taking protective measures, prolong will overheat the motor damage over time.
on the other hand, owe voltage will cause some electric release, make the circuit does not work, can also lead to personal and equipment accident.
So should avoid motor running under the under voltage.
the actual low voltage protection electric appliance is a electromagnetic voltage relay and contactor.
In the electric control circuit of stretch film packaging, only a few lines installed special electromagnetic voltage relay with low voltage protection role, and because most of the control circuit contactor and has low voltage protection function, so don't have added a low voltage protection electric appliances, generally when the grid voltage is reduced to less than eighty-five percent of the rated voltage, voltage relay contactor or action, to cut off the main circuit and control circuit power supply, make the motor stalling.
2.
Stretch film packaging mechanical and electrical voltage protection of overvoltage protection
stretch film packaging mechanical and electrical voltage protection.
Electromagnet, electromagnetic sucker and other large inductance load and dc electromagnetic institutions, dc relay, etc. In general, will produce high power induction electromotive force, will make the electromagnetic coil insulation breakdown and damage.
So you need to adopt overvoltage protection.
Usually for stretch film packaging machine communication circuit, the a resistor and capacitor in parallel on both ends of the coil, for the dc circuit, in a diode in parallel on both ends of the coil, in order to form a discharge circuit, overvoltage protection.
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