Question about APC Smart-UPS RM 1500VA USB & Serial (SUA1500RM2U) UPS System

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The ups supply power from battery even when the mains power is present problem:

Posted by mushew on

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t support

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It is common on budget systems that to maintain operational windows on UPS supply the inverter can be supplied by the mains and the battery so the unit will cope with the low extremes of input volts.

You may of course have a rectifier fault which would also cause a similar situation.

If the batteries charge ok in the normal time, then this is unlikely.

All of these cheaper units are difficult to repair, they are full of surface mount components and unless it is a simple fault, it is likely to cost more than the unit to investigate the fault and repair it.

APC units come with powerchute software, maybe use this to see if it reports any faults, or offers some other information.

Hope this helps, thanks for using FixYa

Posted on Sep 24, 2009

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Rajkumar Bordoloi

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Your ups needs to be serviced

Posted on Sep 23, 2009

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My Yamaha HTR 5590 sounds as if it is powering up but clicks almost immediately and nothing display never lights up and there is just clicks when the standby/on is depressed. any ideas?


Power supply board is the first one to check, then the main board. The power supply board has to have all the voltages present. The main board controls the power-up signal on power supply board.

Feb 08, 2017 | Televison & Video

Tip

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

Tip

UPS - Battery Fault


UNINTERRUPTABLE POWER SUPPLY
Batteries in the UPS typically last 3 to 5 years and it depends upon several factors. Including the number of times the unit must go on battery power and environmental conditions. There are usually several batteries in the UPS and while the battery voltage may show 13 volts, this may only be a float charge/voltage and a true indication of the battery voltage and condition requires the batteries to be tested under a load. If one battery is faulty in a set of batteries it will causes the whole battery system to fail and indicate a battery fault. A faulty charging circuit will not charge the batteries and will also cause a fault condition.

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.

on Dec 02, 2009 | Computers & Internet

1 Answer

LG LED TV. 50LN5700UH. Picture out. It will flash LG Logo on power up then go black. Image is present by flashlight test. Audio is also present. Power LED is also lit.


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electro-medical.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Jan 02, 2017 | LG Televison & Video

1 Answer

Element tv elcpo371


Check the voltages on the power supply board. If they all are present and correct, then the main board isn't sending the On signal to the power supply board. Replace the main board.

Feb 10, 2014 | Element Televison & Video

1 Answer

No power to starter starter is good


Confirm power is availible at starter main power supply, step one , using mutl meter check for 12 volts at battery positive terminal , 2, check main voltage supply lead to starter from battery pos post , 12 volts present? yer check voltage supply lead from battery pos post to altenater , then to starter , 12 volts present, yes , check small wire to starter at starter for switched 12 volts present yes change stater after confirming suitable ground, no, trouble shoot ignition / starter switch in colume

Mar 08, 2013 | 1999 Land Rover Range Rover

2 Answers

GE LP33 UPS inverter failed to start


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

Jan 22, 2013 | MGE Computers & Internet

3 Answers

Can i have all the basic details of UPS system


UPS come in two types, lower powered cheaper types are usually switch over power.
These units senses a power outage and then switch over to the battery power to generate mains supply. The switch over occurs in milli-secs and does not affect the computer.
True UPS types constantly run off battery power to generate mains supply so there is no switch over time lag. These units are higher powered and higher costs units.

Both type of UPS have the same components.
Battery charger.
Batteries
Inverter that converts battery voltage to mains voltage
Electronic controls

Dec 16, 2010 | Emerson PowerSure Personal 500VA...

1 Answer

Dead appearing ups/inverter


keep on your main switch. off all the lights fan and other electrical items, let that inverter get charge first

Jun 18, 2009 | APC Back-UPS CS 500VA UPS System

2 Answers

Battery back up supply


it is possible that the fuse for the input of power is broken or bad

Feb 11, 2009 | Energizer ER-HM650 UPS System

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