UPS Modes
Normal Operation
In normal operation, the UPS supports the load with conditioned power.
Battery Operation
If the utility/mains supply fails, battery power ensures uninterrupted support to the critical load during battery operation.
Requested Static Bypass Operation
The UPS can be transferred to requested static bypass operation following a command from the display. During requested static bypass operation, the load is supplied from the bypass source. If a fault is detected, the UPS will transfer to normal operation or forced static bypass operation. If there is an interruption to the utility/mains supply during requested static bypass operation, the UPS will transfer to battery operation.
Forced Static Bypass Operation
The UPS is in forced bypass operation when the UPS has detected an inoperable state on the system and requests static bypass operation or because the user has pressed the inverter OFF button on the UPS. During forced static bypass operation, the load is supplied from the bypass source.
Internal Maintenance Bypass Operation via the Internal Maintenance Switch IMB (for UPS with One Internal Switch)
When the internal maintenance switch IMB is closed, the UPS transfers to internal maintenance bypass operation. The load is supplied with unconditioned power from the bypass source. Service and replacement can be performed on power modules and the static bypass switch module during internal maintenance bypass operation via the internal maintenance switch IMB. The internal maintenance switch IMB can only be used in single systems with no external maintenance bypass switch/breaker.
Internal Maintenance Bypass Operation via the Maintenance Bypass Switch MBB (for UPS with Four Internal Switches)
When the maintenance bypass switch MBB is closed, the UPS transfers to internal maintenance bypass operation. The load is supplied with unconditioned power from the bypass source. Service and replacement can be performed on power modules and the static bypass switch module during internal maintenance bypass operation via the maintenance bypass switch MBB. The maintenance bypass switch MBB can only be used in single systems with no external maintenance bypass switch/breaker.
External Maintenance Bypass Operation via the External Maintenance Bypass Switch/Breaker Ext. MBB
When the external maintenance bypass switch/breaker Ext. MBB is closed in the external maintenance bypass panel/cabinet or third party switchgear, the UPS transfers to external maintenance bypass operation. The load is supplied with unconditioned power from the bypass source. Service and replacement can be performed on the entire UPS during external maintenance bypass operation via the external maintenance bypass switch/breaker Ext. MBB. For more information, see Shut Down the Single UPS with One Internal Switch into Maintenance Bypass Operation and Shut Down the Parallel UPS System into Maintenance Bypass Operation – for UPSs with One Internal Switch.
Static Bypass Standby Operation
Static bypass standby is only applicable to an individual UPS in a parallel system. The UPS enters static bypass standby operation if the UPS is prevented from entering forced static bypass operation and the other UPSs of the parallel system can support the load. In static bypass standby the output of the specific UPS is OFF. The UPS automatically transfers to the preferred operation mode when possible.
Battery Test
The UPS is in battery test mode when the UPS is performing a battery self-test or a runtime calibration.
ECO Mode
ECO mode allows the UPS to be configured to use requested static bypass, with the load supplied through the bypass, as the preferred operation mode under predefined circumstances. If a fault is detected (bypass voltage out of tolerance, output voltage out of tolerance, etc), the UPS will immediately transfer to normal operation or forced static bypass. The main advantage of ECO mode is a reduction in the consumption of electrical power. In case of interruption to the utility/mains supply, the UPS transfers to battery operation for an uninterrupted supply of the load. The batteries are charged when the UPS is in ECO mode.