TrippLite Frequency Fail

5 months ago
26
Technology Electronics Repair Tripp Lite Smart 1500 Wrong frequency on UPS UPS fail TrippLite Smart1500 high output frequency 120hz

Tripp Lite Smart 1500 LCD, Frequency output while on battery = fail

This UPS failed during a recent outage, ie turned off instead of powering my one NAS from the battery. Outage lasted ~6 minutes.

After repeatedly attempting to reproduce the failure. I connected my oscilloscope to the unit while on battery and found the frequency to be ~119hz instead of the expected 60hz.

Similar tests with an inexpensive multimeter showed approx. 180hz.
Voltage shows ~117.

Connected a desk fan to the power supply, and in this video you can see/hear it slow down dramatically, when the UPS is switched to battery.

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