990-2440 AIS 5000 400V Installation Manual 71
Operation Modes
The display automatically indicates the current UPS operation mode. See the table below for
examples of operation modes and their descriptions.

Operation mode descriptions:

Operation Mode Description of Operation Mode
Normal Operation The inverter supplies the load. The charger uses the mains supply to feed the
inverter.
Battery Operation The inverter supplies the load. The battery bank supplies the inverter. In battery
operation the load support time is limited; when the batteries are discharged the
UPS is unable to supply the loa d.
Bypass Operation The bypass static switch supplies the load, meaning that the load is supplied
directly from the bypass mains. When working in bypass operation the UPS can
switch to battery operation if the bypass mains fails.
Charger Only The charger is recharging the battery. The inverter is shut down.
Economy Operation The UPS is in permanent bypass operation and will only switch to battery
operation if the bypass mains is out of tolerance.
Hot Standby In redundant configurations, one UPS can switch off the inverter, but still keep
the inverter ready for immediate start in case another UPS fails.
Note
In standby mode, the UPS has no output voltage.
Note
Users do not require electrical qualifications to switch the UPS to and from standby
mode/normal operation.