ZJSHUYI MCCB is a plastic case type circuit breaker, referred to as: (MC...

MCCB is a plastic case type circuit breaker, referred to as: (MCCB), A circuit breaker: can be switched on, load and break the current under normal circuit conditions, can also be switched on under the specified abnormal circuit conditions, load a certain time and break the current of a mechanical switching appliance. Second, product selection and engineering design in civil architecture design of low voltage circuit breaker is mainly used for line overload, short circuit, over current, loss of pressure, under voltage, grounding, leakage, dual power automatic switch and not frequent starting of motor, operating purposes, the selection principles in addition to comply with the low voltage electrical equipment outside the use of environmental features and other basic principles of still should consider the following conditions: 1) The rated voltage of the circuit breaker shall not be less than the rated voltage of the line; 2) The rated current of the circuit breaker and the rated current of the overcurrent trip shall not be less than the calculated current of the line; 3) The rated short-circuit breaking capacity of the circuit breaker shall not be less than the maximum short-circuit current in the circuit; 4) The selective distribution circuit breaker needs to consider the short-delay short-circuit on-off capacity and the delay protection between stages; 5) The rated voltage of the circuit breaker undervoltage trip is equal to the rated voltage of the line; 6) When used for motor protection, the choice of circuit breaker should consider the starting current of the motor and make it not operate in the starting time; 7) Circuit breaker selection should also consider the circuit breaker and circuit breaker, circuit breaker and fuse selective coordination. Web: www.shuyitop.com; Tel/Fax: 0086-577-62840011 Wechat/WhatsApp: 008613355775769 #ZJSHUYI #Chinashuyi #shuyitop #breakers #MCB #MCCB

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ZJSHUYI Maintenance requirements for frequency converters. www.shuyitop....

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Maintenance requirements in the day-to-day operation of the frequency converter 1. Check whether the cooling system is normal, and clean the dust of the air filter. 2. Check whether the screws, bolts and other fasteners of the inverter are loose, and perform necessary tightening; for the parts with soldering and crimping terminals, check whether there is corrosion, discoloration, cracks, damage, etc., and also check the frame Whether the structural parts are loose, whether the conductors and wires are damaged, etc. 3. Check whether the connection of the control circuit board is loose, whether the capacitor is leaking, whether the lines on the board are rusted, broken, etc. 4. Check whether the filter capacitor is leaking and whether the capacitance is reduced. 5. Check whether the insulation resistance is within the normal range. www.shuyitop.com; Tel/Fax: 0086-577-62840011 WhatsApp: 008613355775769 #VFD #INVERTER #frequencyinverter #frequencyconverter #shuyitop #converter ...
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ZJSHUYI Usually the soft start system is composed of softstart device. w...

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Usually the soft start system is composed of softstart device, peripheral circuit and motor load. Therefore, the objects protected by the soft start system are also the soft start device, peripheral circuit and motor load. The purpose of protecting the soft start system is to ensure the safe and reliable operation of thyristor components, #softstarter equipment and circuits, and not damage or cause safety accidents under various abnormal working conditions. The premise of #softstarter protection is that the design of the soft starter itself should be correct. The thyristor components are correct and used correctly, the drive circuit and the control circuit are reasonably designed and matched with each other, so that the device can work in a good state. These measures are the basis for the safe and reliable operation of the soft starter. Only under this premise, can the devices, circuits, and equipment fail less and not fail from the inside, and the optimized system design should aim ...
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ZJSHUYI Classic case of inverter maintenance failure.www.shuyitop.com; ...

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Foreword: Inverter repairers must keep in mind that the inverter module and the drive circuit are strongly related to failures. When the inverter module bursts and damages, the drive circuit is bound to be damaged by impact. The damage of the inverter module may also be caused by the failure of the drive circuit. Therefore, whether it is a failure of the drive circuit or the inverter output circuit, it must be The inverter output circuit and the drive circuit are thoroughly inspected together. The power-on test of the main circuit must be carried out under the premise that the drive circuit is normal and can output six excitation pulses normally. Inverter power failure A 132KW inverter has a black screen fault. Part of the wire drawing machine stopped in the wire drawing workshop, and restarted production after half a month. As a result, the inverter went black after being powered on. It was judged that the switching power supply was faulty on the spot. The inverter was removed, and th...
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