Appendix D: Bypass Undervoltage /
Overvoltage
When the 1800 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 re-initialize.
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.
42 | 1800 Series User Manual |
