I connect the UPS to mains power and the LCD lights up with no messages and I cannot power up the UPS. Batteries are ok, tested in another unit, the fan starts also. Once mains is removed 2 seconds later the unit will turn off. Any ideas?
I have exactly the same problem on my 9120 1500va. Panel lights up but won't power on. Tried new batts and cleaned out all the muck in the cabinet. Checked for loose connections, etc. It will go through all the settings using the top left button but when it gets to the batt test it says batts not charged. But they are - definitely. The mains pass through relays click when the mains is plugged in but it doesn't pass the mains through. They drop a few seconds after the unit is unplugged.I have exactly the same problem on my 9120 1500va. Panel lights up but won't power on. Tried new batts and cleaned out all the muck in the cabinet. Checked for loose connections, etc. It will go through all the settings using the top left button but when it gets to the batt test it says batts not charged. But they are - definitely. The mains pass through relays click when the mains is plugged in but it doesn't pass the mains through. They drop a few seconds after the unit is unplugged.
Thanks for the posting. Have already checked the charging circuit components and the batteries are definitely charging. Took out the battery pack and discharged it to 44v through an external load. Put it back in the unit and plugged in. Starts off at 1.2 Amps and gradually drops to 20/30milliamps when battery voltage has reached about 55v. Problem seems to be that the logic of the unit can't see the battery voltage. Unit will not power on and light up the panel but you can see and alter the settings. Would be nice to have a circuit diagram.Thanks for the posting. Have already checked the charging circuit components and the batteries are definitely charging. Took out the battery pack and discharged it to 44v through an external load. Put it back in the unit and plugged in. Starts off at 1.2 Amps and gradually drops to 20/30milliamps when battery voltage has reached about 55v. Problem seems to be that the logic of the unit can't see the battery voltage. Unit will not power on and light up the panel but you can see and alter the settings. Would be nice to have a circuit diagram.
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The battery charger inside the UPS is faulty so check the transistors including the rectifier on the heat sink. Replace the faulty ones and your UPS will be good. I strongly suggest that you check all the transistors on the PC board just to make sure that the whole board is ok after replacing the transistors
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ups units run a computer directly from mains power and from a battery when mains power is cut.
some run the computer through the battery at all times and so use the battery as a surge protection
points to check on your unit
is the by pass system being damaged in the surge protection section
is this requiring the batteries to provide power but not being charged at the same time
Is the power consumption exceeding the battery rating ( pc, printer, monitor , modem etc exceeding the out put of the ups
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.
This indicates the battery is worn out and will not provide power in the event of a mains power failure. To test the battery, connect a computer or some other device to the output on the UPS, and connect the UPS to the mains supply. Turn on the mains power to the UPS and power up the computer, then turn off the main power to the UPS and if the computer switch off in a short time. This proves the battery is old and needs to be replaced.
I assue you connected the UPS to a TV to test the UPS unit.
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 in a set of batteries that is faulty and causes the whole battery system to fail and indicate a battery fault. A faulty charging circuit will not charge batteries and will cause a fault condition. These lower powered and cheaper type UPS are switch over types, when the mains supply fail, the UPS switches over to the battery and inverter in milli-seconds which then supplies mains power. A faulty inverter circuit and or flat batteries won’t deliver standby power when the mains supply fails.
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. There maybe one battery in a set of batteries that is faulty and causes the whole battery system to fail and indicate a battery fault. These lower powered and cheaper type UPS are switch over types, when the mains supply fail, the UPS switches over to the battery and inverter in milli-seconds which then supplies mains power. A faulty inverter circuit and or flat batteries won’t deliver standby power when the mains supply fails.
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. There maybe one battery in a set of batteries that is faulty and causes the whole battery system to fail and indicate a battery fault. 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.
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. There maybe one battery in a set of batteries that is faulty and causes the whole battery system to fail and indicate a battery fault. 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.
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. There maybe one battery in a set of batteries that is faulty and causes the whole battery system to fail and indicate a battery fault. 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.
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 enviromental conditions. There are usually several batteries in the UPS and while the battery voltage may show 13 volts, this may only a float voltage and a true indication of the battery voltage needs the batteries to be tested under a load. there maybe one battery that is faulty and causing the whole battery system to fail.
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.
The true UPS type are usually the higher KVA units (over 1500 KVA units) that converts mains power continuously via the inverter circuit. The mains power charges the batteries and the inverter drawing power from continuously from the batteries (therefore there is no switch over time lag from the mains to the battery.
I have exactly the same problem on my 9120 1500va. Panel lights up but won't power on. Tried new batts and cleaned out all the muck in the cabinet. Checked for loose connections, etc. It will go through all the settings using the top left button but when it gets to the batt test it says batts not charged. But they are - definitely. The mains pass through relays click when the mains is plugged in but it doesn't pass the mains through. They drop a few seconds after the unit is unplugged.
Thanks for the posting. Have already checked the charging circuit components and the batteries are definitely charging. Took out the battery pack and discharged it to 44v through an external load. Put it back in the unit and plugged in. Starts off at 1.2 Amps and gradually drops to 20/30milliamps when battery voltage has reached about 55v. Problem seems to be that the logic of the unit can't see the battery voltage. Unit will not power on and light up the panel but you can see and alter the settings. Would be nice to have a circuit diagram.
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