1) Go to bypass
2) Drop load
When the UPS is set to Go to Bypass the bypass operating range is -20% to +10% of the phase-phase output voltage. When the UPS is set to Drop Load the bypass operating range is -12% to +6% of the phase-phase output voltage. No matter which setting is chosen, if the input voltage is outside of the specified range the UPS will turn off power to the load rather than subjecting it to undesirable voltage levels.
When commanded into bypass via the PowerView or an accessory only, is more selective. If the input AC voltage is outside the range -12% to +6% relative to the input voltage selector setting, or the output frequency is not synchronized to the input, the UPS will not allow itself to be commanded to bypass if it is currently operating on-line. When commanding the UPS into bypass via an accessory, the bypass setting mentioned above is NOT used.
Keep in mind that, when absolutely necessary, the UPS can still be forced into maintenance bypass via the breaker on the UPS. If the UPS does not allow itself to be commanded into bypass via the PowerView or any other accessory, damage to connected sensitive loads may result by forcing bypass via the maintenance bypass switch.