---The mains supply interrupt or exceptionally fluctuates to the CNC equipment's influence
1: The power source question produces reason: The power plant sends out the electric power has certain limit, when uses electricity the peak surpasses its elevating capacity, the electrical network is compelled the voltage dropping power supply, this is causes the entire electrical network to form the low voltage; When uses electricity the trough the load is very light, like this will use the network voltage to elevate causes the entire electrical network to form the pressure; When the electrical network power factor is excessively low, the power supply department uses the investment or excises electrical network's capacitor regulating power factor, by now will arouse the peak voltage in the electrical network, the following three form string entered the user and power supply system's disturbance, also will form the electrical network pollution:
• as a result of is struck by lightning produces on distribution line's high-pressured surge or the peak voltage, this kind of high-pressured surge or the peak voltage may reach the 200~300KVA magnitude take string discharging current, the pulse width only as the 0.1~0.2mS high-pressured peak pulse mode appears.
• in user's power supply system, as a result of transformer's investment or the excision, the large-scale electric motor opens stops, the electric welding machine/spot welder's movement, the heavy load silicon-controlled rectifier load's movement and so on produces the work (operation) the surge or the peak, this kind of disturbance's peak voltage may reach 6KV, the discharging current reaches the 10KVA magnitude scope.
• possibly appears as a result of each kind of electromagnetic interference carries on the data electric cable/communication holding wire's transient state surge is the peak voltage is 5KV, the discharging current several hundred ampere magnitude disturbances.
2: The country is the voltage fluctuates to electrical network's request in 380V±10% scopes, the frequency calls in 50HZ±5% fluctuations normally. But in fact seriously is lacking electricity today, the power source quality far compared to the stipulation data difference, particularly the mains ondulation distortion and the overtone, (for example the SMT/CNC equipment and so on) constitutes the serious damage and the loss to the automatic production line equipment, mainly has the following several points:
1st, the power source sudden stop or the intermittent power failure, will create the equipment damage, the product waste product and have the flaw product rise.
2nd, the supply voltage not steady and the frequency will not be steady will cause the equipment to get older in the production process speeds up, the bad productivity rate will increase, serious will also damage equipment's part.
3rd, in mains supply massive overtones, but also the control will create the disturbance to the equipment, will affect its normal control function, serious will even create the control the damage. The UPS power source is carries on the cleaning treatment to the power source, it can the regulated voltage, the stabilized frequency, relieve the power source distortion and the harmonic interference, provides the reserve time, guarantees the equipment safe normal operation. At present the major part has the machining center enterprise necessary UPS electrical power unit.
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