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  • UPS Power and Raw Power - CR4 Discussion Thread - GlobalSpec
    Conversely, in addition to being "clean" of spikes or harmonics, UPS power is there (at least for a while) if and when the RAW power is not available without any disruption in operation UPS will buy time to get a back-up generator operating, or to facilitate an orderly shut-down of critical electronic equipment without damage or loss or data
  • UPS Supply and Raw Power - CR4 Discussion Thread
    Care is to be taken so that when the contactor for UPS power is energised , its auxilary contact ( NC ) should prevent the RAW power contactor from energising When the UPS power fails the auxiliary contact of UPS power contactor would make the RAW power contactor to pick up Here the hitch is a bumpless change -over is very difficult to achieve
  • UPS Transformer ?!? Specifications - Power Supply?
    The RV has a converter which makes a stable 12 power supply but is a lousy charger The heart of the converter is a ferroresonant transformer I will admit that I do not understand all the theory of operation for this type of transformer but in practice I can tell you it never attains an adequate voltage to charge a lead acid battery
  • Whats the Current at the Input for a UPS? - GlobalSpec
    If, UPS has a 125A main MCCB, we must supply power with at least 125A MCCB Supply cable must have ampacity to meet the125A MCCB This is true even the load current is 60A For bypass circuit, 3phase input 1 phase output transformer (primary V connected, secondary inverted v connected) has very tricky primary currents
  • Subwoofer Near UPS - CR4 Discussion Thread
    Will it affect my UPS, i mean in terms of more noise in electrical current so that can affect my Power Supply or perhaps affecting in transfer time (if my UPS is offline type) so it needs more time to transfer from primary source to secondary source, etc
  • How to Synchronize from diesel generator to Grid power system
    1 Have UPS of 1 min capacity for each 13 production lines 2 Have Automatic Mains failure DG start facility that whenever the plant mains supply failes, DG shall start within 6 seconds and feed power to selected feeders Again, whenever Mains supply is resumed, DG shall automatically stop plant shall run on mains supply
  • UPS Input and Output Cable Size - CR4 Discussion Thread - GlobalSpec
    People: I have a 5kVa UPS It is to supply a single load of 4KVA The power cable from the UPS to load is 4mm2 3 core Does the cable leading to the UPS (input) also need to be same capacity as that leading to the load Since the UPS is powering the load, I would expect higher current there (UPS output), than the UPS input Please advise Thanks
  • PLC Going to Offline Mode - CR4 Discussion Thread - GlobalSpec
    The PLC panel is fed from a UPS power supply and we have observed that it is working fine and there is no visible lag or dip in switching when there is a power change over One service engineer suggested to change the PLC battery and check the UPS output voltage, i have done both and found UPS output voltage is also normal
  • Six-Pulse UPS vs. Twelve-Pulse UPS - CR4 Discussion Thread - GlobalSpec
    So a standard power conversion scheme, one that does nothing to address this, is a "6 pulse" rectifier; it has 6 diodes in a bridge configuration to rectify the AC into DC for the UPS to use Putting a transformer (as electricaexpert65 described) ahead of the UPS and using 2 rectifiers (2 x 6 pulses = 12 pulse) will reduce the THD, usually by 1 2
  • A Common Mistake in Wiring of UPS Opereated Lights and Fans
    When utility power supply is shut down, UPS enables and bypass relay switches the output to UPS The question which I want to ask is that, the electricians run a single wire from UPS output to the switch boards and connect the other wire of UPS to the wiring common (neutral) wire which is common for utility power supply operated lights, fans





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