This is a 3-phase UPS. The Voltages for the three phases are 243V, 251V & 245V but the input inside is showing 299V.
It gives a beep and gives a message : "voltage out of range".
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Re: FAULTY MGE UPS
A 3 ph ups normally can work upto 450 volts because the normally its the transmisson range of voltage
220 to 250 is the voltage range of normal 1 ph line so check for proper line voltage or load voltage
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bypass is not available because your input is going in one phase rotation and the bypass is going another. Both input and bypass needs to be a clockwise rotation. A cheap phase rotation meter will fix this. Call me at Gruber Power Services for free tech. support 800-658-5883 x256 ask for Eric
Did you measure with a true RMS meter? If yes,the results are normal,but your ground connection is not very good. The case has 110v potential (exactly half of the input&output 220v) because of the input and output capacitor filters (a capacitor is conectet from phase to casis and an other from neutral to chasis,thus resulting a 1/2 voltage divider). Because of this,the earthing is necessary.
u can take three incadescent bulbs of same rating, connect them in 3 phase star connection, means 3 phase 4 wire connection..connect it across supply..the bulb connected across low voltage phase will glow dimmer than other two
if this comes sometimes and goes, this means that the power to ups is sometimes deviating from the specific ups input range, hence the ups is rejecting it. mesure the input voltagesand frequency with a multimeter and check whether they match the specified ones in the ups manual. aslo with some ups there are switches that you use to set the input voltages or number of phases in the ups input. check the manual to see whetther your ups has such.