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Appendix E: Bypass Undervoltage / Overvoltage
When the 1700 Series UPS is in bypass mode and bypass is disabled
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 output will be turned on.
When the UPS is first 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.
The overvoltage and undervoltage limits can be turned off by the user if
desired (see "Function Control Button"; section 3 "Programming mode";
part B, page 18). If bypass is "enabled" the bypass voltage window will
not be restricted. In the bypass enabled state whatever voltage appears
on the input will be passed on to the output. This helps to ensure that
the UPS output will never be turned off; however, very high or low
voltages could be passed on to the attached equipment.
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