Display by LED indicator. Check the 3 phase wire connection, L1-A-R, L2-B-S, and L3-C-T throught the 3 red LEDs to prove the each wire is connected correctly. Check if L1,L2 and L3 are in connected to the 3 phase motor. Check the motor's direction of rotation, and indicate ER 9counter-clockwise) with a red LED and OK (clockwise) with a green LED. Low battery indication.