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GE LP33 UPS inverter failed to start

I have a GE LP33, 30KVA UPS. Here is the situation (problem), -Mains power goes off, generator failed to start, -UPS takes over the load for its backup time of 15 minutes, -power still not back, -UPS shuts down because its batteries are drained, -mains power is back, -UPS starts but inverter fails to start giving and alarm "inverter cannot be started. I was once able to clear this alarm and restart the inverter by completely shutting down the UPS; but this is not acceptable since it interrupts power to the load. Can anybody help figure out why this is happening? Is there any way to clear the alarm without completely shutting down the UPS? Your help is highly appreciated. Yared

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Dear Yared,

Did you try to give the UPS some time to recharge the batteries?
Seems like the batteries have reached their cut-off voltage and are not supplying enough voltage to the inverter.

Normally the dc boos circuit of the UPS will supply voltage to the DC BUS so maybe the problem can be found in the dc boost circuit or BUS if recharging the batteries is not helping.

Let me know.

Best Regards,


Ron

Posted on Feb 02, 2013

  • Yared Abebe Feb 12, 2013

    Dear Ron, Thank you for the feedback. Yes, I have given the UPS enough time to recharge the batteries. I found that the battery charger fuse for the negative string of batteries blown. I have changed the fuse, however the batteries on the negative string side have lower voltages (12.1V) compared to the positive side (13.6V). I have decided to change the batteries; what do you think? Regards, Yared

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I have a GE Lp33 30KVA ups. I just renew the batteries and the problem is when the main power goes off all the loads goes off as well.As if the ups is not giving any power.But when main is present everything stays on.I can read the load output current per phase and so on.This indicates the ups is working normally when main power in on. Any suggestion?

Posted on Feb 27, 2014

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Posted on Jan 02, 2017

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SOURCE: Problem with Compaq UPS T1000h

I had a problem like this one, check the voltage from the generator , if the output from the generator is to high (over 240 Volts european standard voltage), the voltage protection (VDR resistors ) will brake the fuse to protect your UPS.
and also check the frequency of the generator, it has to be very stabile around 50HZ (european standard frequency)

Posted on Sep 20, 2009

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APC Smart VT 30KVA UPS cannot sustain power after power failure


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UNINTERRUPTIBLE POWER SUPPLY


UPS – UNINTERRUPTIBLE POWER SUPPLY
Uninterruptible power supplies provide protection against mains power faults to computer equipment.
These faults include voltage spikes/interference, over voltage and under voltage, mains supply interruptions and surge protection etc.
These faults can cause computer and electronic equipment that are connected to an unprotected mains supply to malfunction and/or sometimes fail.
A common problem, when burning Cds, DVDs etc. any slight power interruptions to the burning process will halt the recording process and rendered the disc useless.

There two type of Uninterruptible Power Supplies
The lower powered and cheaper type UPS are switch-over types, when the mains supply fails, the UPS switches over to the batteries and inverter in milli-seconds which then supplies mains power to the computer and peripherals. A faulty inverter circuit and or flat batteries won’t deliver standby power when the mains supply fails.
NOTE : The mains waveform from these UPS is a pseudo sine wave (i.e. not a true sine wave).
The true UPS types are usually the higher KVA units (over 1500 VA) that supply continuous mains power. The mains power is connected to a charger which charges the batteries and then the inverter draws power from these batteries and converts it to true sine wave mains power to the computer equipment, therefore there is no switch over time lag when the mains supply fails.

on Dec 06, 2009 | Computers & Internet

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UNINTERRUPTABLE POWER SUPPLY
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Lower powered and cheaper type UPS are switch over types, when the mains supply fails, the UPS switches over to the battery and inverter in milli-seconds which then supplies mains power to the computer and peripherals. A faulty inverter circuit and or flat batteries won’t deliver standby power when the mains supply fails.

NOTE the power waveform from these UPS is a pseudo sine wave (i.e. not a true sine wave).

The true UPS types are usually the higher KVA units (over 1500 VA) that supply continuous mains power. The mains power is connected to a charger which charges the batteries and the inverter draws power from these batteries and converts it to true sine wave mains power to the computer equipment, therefore there is no switch over time lag when the mains supply fails.

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Dc bus faulty


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These lower powered and cheaper KVA type UPS are switch over types, when the mains supply fail, the UPS switches over to the inverter in milli-seconds which then supplies mains power but the power waveform is a pseudo sine wave (ie not a true sinewave. A faulty inverter circuit won’t deliver power when the mains supply fails.

The true UPS types are usually the higher KVA units (over 1500 VA) that supplies uninterrupted mains power. The mains power is connected to a charger which charges the batteries and the inverter draws power from these batteries and converts it to true sine wave mains power therefore there is no switch over time lag from the mains to the battery.

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These lower powered and cheaper KVA type UPS are switch over types, when the mains supply fail, the UPS switches over to the inverter in milli-seconds which then supplies mains power but the power waveform is a pseudo sine wave (ie not a true sinewave. A faulty inverter circuit won’t deliver power when the mains supply fails.

The true UPS types are usually the higher KVA units (over 1500 VA) that supplies uninterrupted mains power. The mains power is connected to a charger which charges the batteries and the inverter draws power from these batteries and converts it to true sine wave mains power therefore there is no switch over time lag from the mains to the battery.

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These lower powered and cheaper KVA type UPS are switch over types (when the mains fail, the UPS switches over to the inverter in milli-seconds to supply mains power). It is a possibility the inverter circuit is faulty and when the mains power fails the inverter does not switch over.

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