2. To check the UPS installations push the button . The LCD-displays
changes over to drawing Q1 (buzzer) -> drawing R! (self test) ->
drawing S1 (tolerance window for the bypass voltage) -> drawing T
(output frequency synchronization tolerance window) -> drawing U
(inverter output voltage) -> drawing V1 (UPS service mode) -> drawing
W (output voltage micro installation factor) -> drawing X (UPS id) ->
drawing Y (no. of the UPS in the parallel mode)