on each UPS unit. The loading process for the intermediate circuit starts (LED 1 flashes in green/yellow). Following a successful pre-charge the rectifier is started. Thus, the system is in rectifier operation and LED 1 lights up in green, the LED`s 2 and 4 light in yellow.
7. Close all the battery breakers (Q040 & Q041) simultaneously or immediately one after another (within 5 seconds). LED 3 glow green.