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Appendix A:
Adjusting Input Frequency Tolerance
The Sola 620 Rackmount automatically switches to battery operation whenever the input
voltage is outside an acceptable frequency tolerance. This tolerance is user selectable from the
factory preset value of 50 and 60 Hz, ±5%, to ±7%, and to ±2%.
You can use the Alarm Silence/Battery Test button to change the tolerance (while the UPS is
operating on AC input power) by following these steps:
1.
Press and hold the Alarm Silence/Battery Test button for 10 seconds. When the UPS beeps
twice, two LEDs illuminate to display the current frequency tolerance selection: LEDs 1 and
6 indicate ±7%; LEDs 2 and 5 indicate ±5%; and LEDs 3 and 4 indicate ±2%.
2.
Press the Alarm Silence/Battery Test button for 1 second to advance through the various
selections, until the LEDs indicate the desired frequency tolerance.
3.
When the desired LED display is illuminated as shown in the drawing below, press and hold
the Alarm Silence/Battery Test button for 10 seconds. When the UPS beeps once and the
LED pattern changes, the UPS has stored the new frequency tolerance selection and has
returned to normal operation.
4.
If you do not store a new selection as described in Step 3, after 10 seconds the frequency
tolerance automatically resets to the default value of ±5% and the UPS returns to normal
operation.
±5%
±2%
±7%
1
3
2
4
5
6
