ABB REACT-3.6-TL Application Note page 11

At least one of the following STOP conditions must be met for the backup mode output:
1. Press 'ESC' on the display for at least 5 seconds
INPUT
CONDITION
2. Return of mains voltage (Voltage OK at the inverter's output terminals)
S
Once it has left the backup mode, the inverter will check the conditions of the public mains network and,
after ensuring that Voltage and Frequency parameters are correct, it will start the reconnection sequence.
4. Mode: Manual 4
In Manual Mode 4, the inverter may operate in the backup mode if and only if the following three
conditions simultaneously exist:
1. Power failure at the output terminals of the inverter (Voltage and Frequency values outside the
Mains OK range, established according to local standards).
INPUT
2. Control/signal from external logic (to set the control, see section 5.4);
CONDITION
3. Manual user activation (press "Enter" on the display for at least 5 sec);
S
If this mode has been set, the inverter will switch to backup operation if and only if the system is in power
failure conditions (absence of voltage at the inverter's output terminals), the activation signal sent by the
external logic is present, and the user decides to activate the system's backup operation.
A possible scheme that can be designed and that describes the operation of this mode is shown below:
Manual 4: Backup operation after activation of the 300mA differential switch, presence of external control and manual activation
At least one of the following STOP conditions must be met for the backup mode output:
Application Note| REACT-3.6/4.6-TL – BACKUP OUTPUT|Operation and Configuration 11