Toshiba RELIABILITY IN MOTION 1700 - Manual (Page 33)

TOSHIBA
33
Appendix E: Bypass Undervoltage / Overvoltage
When the 1700 Series Rackmount 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 12.)
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.