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“ battery backup chattering ”

RELATED FAQS

Question
Answer
Why is the Von Duprin PS873 power supply buzzing or chattering?
Some transformers in the power supplies provide a little humming noise and that is normal. If the humming in Von Duprin PS873 power supply is loud follow these steps. Remove the load from the outp...
Are there MSDS sheets for the batteries in the 900-BB?
Attached are the MSDS (material safety data sheet) of the three different manufacturers of batteries for the 900-BB battery backup.   MSDS for 900-BB
Are the batteries for the PS 914 BBK the same as the ones from the 873 BB?
The battery for the PS873 and PS914 are the same, 7AH sealed Lead Acid  battery.
Can Battery Backup (BB) be added to a PS900 series power supply in the field?
Battery backup can be added to the PS900 series power supplies. Order the 900-BBK to get the battery backup board and batteries for field installation.
What are the visual differences on a F-Series handreader main boards that have battery backup and main boards that do not have battery backup?
See  Board Differences Battery Backup Circuitry  for a picture of the visual differences between a F-Series biometric handreader with a main board that has the battery backup ci...