LEGRAND KEOR HP 400kVA Installation Et Démarrage page 46

8 BYPASS START UP
WAIT PLEASE
9 BATTERY START UP
CLOSE BCB
10 BATTERY START UP
WAIT PLEASE
11 UPS START UP
CLOSE OCB
12 START UP END
WAIT PLEASE
End UPS MODEL
OUTPUT VOLTAGE
5.3 BASIC TROUBLESHOOTING
This paragraph provides the basic information if any problems occur during the start-up
procedure. In case the problem cannot be solved, contact the service department.
1) After closing RCB the LCD display is still blank

Check the phase rotation of supply voltage.

Make sure the input voltage and frequency are within tolerance.

Check the rectifier protection fuses F1-F2-F3; they are inside the unit.
2) After step #1 the UPS stops the starting sequence and shows one or more alarm
messages

Check the alarms indicated on the display and remove their causes.

Close RCB and try to restart the UPS.
3) After step #2 the unit shows the alarm A15 – Byp fault

Make sure you have closed circuit breaker SBCB.

Check the protection fuses of the static bypass switch; they are inside the unit.

Check the phase rotation of the bypass voltage.

Make sure voltage and frequency are within tolerance.
4) After step #3 the unit shows the alarm A7 – BCB open

Make sure you have closed the battery circuit breaker; the circuit breaker or the
fuse carrier is external to the UPS system.

Check the battery fuses.

Check the interconnection between the auxiliary contact of the battery circuit
breaker (in the external cabinet) and the terminals Bac1-Bac2 of the UPS.
46 OMD39075 REV. F
Installation and start-up of UPS Keor Hp 400-800kVA
Installation et démarrage de l'UPS Keor Hp 400-800 kVA
Installazione e avviamento UPS Keor Hp 400-800kVA
Close BCB
Close OCB
The control logic checks that all the bypass
parameters (voltage,
frequency) are correct. LED #2 is lit green:
bypass voltage present
The control logic checks the closing of the
circuit breaker to go to the following step.
Led #4 lit green.
The control logic checks that all the output
parameters (voltage, current, frequency) are
correct. LED #7 is lit green: output voltage
present.
The default screen is displayed after a short
time with the UPS model and the values of
output voltage.
phase rotation,