Control And Operation Devices; Isolators (Dc Input And Ac Output); Emergency Power Off Button (Epo) - LEGRAND KEOR HP 60kVA User Manual

3.4

CONTROL AND OPERATION DEVICES

The control and operation devices of the UPS are indicated below:
 AC isolator on rectifier input (RCB)
 AC contactor on bypass line input
 Isolator on UPS output (OCB)
 Manual bypass isolator (MBCB) – Optional external for KEOR HP 400-800kVA
 Battery Isolator / Circuit breaker (BCB) – Optional, outside the UPS
 Emergency power off button (EPO)
 Normal/Bypass selector (SW1)
 LCD control panel
Check the personnel training
The use of the operation and control devices of the UPS is intended for authorized
personnel only. We recommend to check the training of the personnel responsible for
the use and maintenance of the system.

3.4.1 Isolators (DC input and AC output)

The isolators provided on the UPS are used to isolate the power components of the device
from the AC supply line, from the storage battery and from the loads.
Voltage present on terminals
The isolators do not isolate the UPS completely, where the AC line and battery
voltages are still present on the terminals. Before carrying out any maintenance on
the unit:
 Isolate the device completely by operating the external circuit breakers;
 Wait at least 5 minutes in order to allow the capacitors to discharge.

3.4.2 Emergency power off button (EPO)

The emergency power off button is used to disconnect the UPS output immediately,
interrupting the loads supply. It also shuts down the inverter.
Press the button only in case of real emergency
The components of the system are subject to a high stress when the emergency
power off button is pressed under load presence.
 Use the emergency power off button only in case of real emergency.
UPS user manual
Manuel de l'utilisateur de l'UPS
Utilizzo dell'UPS
OMD10074 REV. C 15