Question about MGE UPS Galaxy 3000 UPS System

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NO VOLTAGE ON YELLOW PHASE

While attending to this unit I discovered that load supported through yellow phase had no power on static bypass and after resetting the unit it kept switching off after 10 minutes. What could be the problem?

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  • 65 Answers

What caused the UPS to transfer to Bypass? could be inverter fault, would you please check your battery set, maybe the input power is outside the tolerance and causing UPS to discharge the battery set , as well when battery set reaches the end of discharge it is causing the UPS to transfer to bypass and there is something missing on the input yellow Phase.
if the above is not true check the load type that is connected to the UPS output that is causing UPS to switch off in 10 minutes time.

Posted on May 12, 2014

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  • 21 Answers

What`s the nominal voltage of this unit?? 208v?
what voltage are you having at the input of the ups?
are there any alarms shown at the screen?
what LED`s are lit?

Posted on May 08, 2014

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Posted on Jan 02, 2017

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SOURCE: case 1: 220 V, 50Hz applied

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.

Posted on Jan 16, 2011

epettingill
  • 175 Answers

SOURCE: when switched the bypass to

You didnt start the UPS correctly because the static switch was not on. The Static Switch has to be on to get a clean transfer of power. Check your static switch

Posted on Oct 27, 2011

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why don't you check the output fuses of the UPS if are ok than fix or replace the power module.

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hello

make note of positions of wires and colors before moving and wires so can be put back if need to

in general 3 phase motors can be reversed by reversing only one of the phases that come in

as far as i know forward rotation sequence would be red, yellow, blue , (these are the 3 phase wires and could also have a black wire nuetral if the motor is a unbalanced load motor

but think that phase color blue is now white according to electricity regs for 3 phase motors

if the motor is a balanced load motor it may not have a black wire
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(the function of the nuetral conductor is to to carry the out of balance current if the loads on each of the 3 phases is diffenent ) and of course has a earth wire as well ( which is yellow/ green )

you should reverse either red and yellow position only or yellow and white position only

but if in doubt check with your local electrcian to confirm
always check electrcity regs before altering

cheers






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I have not wire this myself
Wiki says under heading of single-phase:
http://en.wikipedia.org/wiki/Three-phase_electric_power
Single-phase loads may be connected to a three-phase system in two ways. A load may be connected across two of the three phase conductors or a load can be connected from a live phase conductor to the system neutral. Single-phase loads should be distributed evenly between the phases of the three-phase system for efficient use of the supply transformer and supply conductors. Where the line-to-neutral voltage is a standard utilization voltage (for example in a 230 V/400 V system), individual single-phase utility customers or loads may each be connected to a different phase of the supply. Where the line-to-neutral voltage is not a common utilization voltage, for example in a 347/600 V system, single-phase loads must be supplied by individual step-down transformers.

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