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battery backup chattering
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Question
Answer
Why is the Von Duprin PS873 power supply buzzing or chattering?
Resolution:
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?
Resolution:
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?
Resolution:
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?
Resolution:
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?
Resolution:
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...: