Question about APC Smart-UPS 620INET (SU620INET) UPS System
My APC 620 VA ups needed battery replacement. For the time being to get the surge protection I was running the unit (without battery) with the help of a battery eliminator(out put 12V DC). I think it stopped functioning when one of the battery terminals got shorted with the chachis . But now I tried with a healthy battery. Whenever the battery is connected a chattering sound is coming from the unit. The sound continues even when the 230Vac mains is switched on. In this condition if the battery is disconnected then the frequency of sound is reduced to very low. The unit is not getting on at all. Model- SU620 INET (APC 620 VA). Can anybody help providing solution and circuit diagram?
Try changing electrolytic capacitors in charging circuits and diodes near relays
Posted on Sep 29, 2013
If the battery terminals inside the unit became shorted, it's really not a user serviceable problem. APC doesn't publish schematics.
Posted on Jan 01, 2013
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Posted on Jan 02, 2017
Yes, but the battery may not be any good, though, and trying to charge it may damage the charger. A new battery is about $20. The surge suppressor will still work without the battery as long as it is connected to a properly grounded 3-wire circuit. If you decide to take a chance and charge the old battery, take precautions like keeping a watch on it should it explode or catch fire. Not trying to scare you, just looking at worst case scenario.
Posted on Jan 27, 2009
There are 6 outlets on that unit. Only 3 of them have battery backup. The other 3 are surge protection only. Are you sure of which outlets you are using?
Posted on Jun 20, 2010
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