120 to 110 Volt Converter/Regulator/UPS
120 to 110 Volt Converter/Regulator/UPS
(OP)
I have been assisting someone with a failures of electronic boards in equipment made overseas. The equipment is rated at 110 VAC +/- 10%. Monitoring reveals the voltage to the site is well within recommended limits for 120 volt service 114-126 volts, most of the time around 121-123 volts. This is over the limit for the equipment rating of course but probably does not cause damage to the equipment. However, in order to satisfy the vendor, the customer would like to get the supply voltage to the electronic equipment to the 110 volt level. The 30 or so sensors that have the failing boards are supplied by an APC Smart-UPS 3000. It's output is 120 volts. Is there a voltage regulator, UPS or converter that takes 120 volt nominal voltage and convert it to 110 volts? I could use a variac I suppose but I would like to see it maintained at 110 volts like an online double conversion UPS would do for 120 volt systems.
thanks
j
thanks
j






RE: 120 to 110 Volt Converter/Regulator/UPS
You might want to look at the output of the UPS when it is in battery mode and see if you are getting a sinusoidal output or a square / quasi-square output. That would be my immediate concern with a cheap UPS.
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If we learn from our mistakes I'm getting a great education!
RE: 120 to 110 Volt Converter/Regulator/UPS
RE: 120 to 110 Volt Converter/Regulator/UPS
RE: 120 to 110 Volt Converter/Regulator/UPS
RE: 120 to 110 Volt Converter/Regulator/UPS
I have also talked to the Dutch vendor. They have confirmed that this equipment is rated 110 VAC +/- 10%. The facility is fed from a single phase transformer standard U.S. service entrance votlage of 120 volts. That means if the delivery voltage is slightly over nominal, let's say 122 volts (which is perfectly acceptable) it is over the rating of the equipment. I am not sure that would be enough to damage components in this equipment. Hence my search for a relatively inexpensive fix at the point where these sensors are supplied voltage, not the entire facility. If the taps were to be changed at the transformer (if there were taps available) then the other equipment rated at 120 volts would be seeing low voltage.
j
RE: 120 to 110 Volt Converter/Regulator/UPS
Doesn't address the problem of the UPS transferring onto battery, but the most likely causes of that are either an under-sized supply coming in to your premisies or under-sized cabling within your premises. If the UPS transferring to battery is a problem you need to address it separately.
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If we learn from our mistakes I'm getting a great education!
RE: 120 to 110 Volt Converter/Regulator/UPS
Rafiq Bulsara
http://www.srengineersct.com
RE: 120 to 110 Volt Converter/Regulator/UPS
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If we learn from our mistakes I'm getting a great education!