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Appendix E: Bypass Undervoltage / Overvoltage
When the 1700 Series UPS is in bypass mode the undervoltage and
overvoltage limits are restricted to +/-10% of the rated input voltage. If
the input voltage is outside of this voltage window the UPS output will be
turned off. There is a 5% hysteresis associated with both the upper and
lower limits. This means that once output has been turned off the input
voltage will have to be within ±5% of the rated input voltage before the
startup sequence will reinitialize. (To start the UPS when the input
power is outside of the allowable range see the section entitled “Starting
on DC Power”, page 13.)
When the UPS is started, if the RUN/STOP switch is in the STOP
(bypass) position the unit will start in the on-line mode for 1 second
before switching to bypass mode. If the input voltage is out of range the
UPS will turn off the output after 1 second rather than switching to
bypass.