Wärtsilä JOVYSTAR COMPACT M
BAX 5480
- 50 -
11.4 Control and Operation Devices
The control and operation devices of the UPS are indicated below:
Isolator on rectifier input (RCB)
Isolator on bypass input (SBCB)
Isolator on UPS output (OCB)
Manual bypass isolator (MBCB)
Battery Isolator / Circuit breaker (BCB) - External, inside the battery cabinet
Emergency power off button (EPO)
Normal/Bypass selector
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.
11.4.1 Isolators
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 load.
Voltage present on terminals
The isolators do not isolate the UPS completely, since AC voltage is still present on the UPS
input 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.
11.4.2 Emergency Power Off Command (EPO)
The emergency power off command is used to disconnect the UPS output immediately, interrupting
the loads supply. It also shuts down the inverter.
Operate the command only in case of real emergency
The components of the system are subject to a high stress when the emergency power off
command is operated under load presence.
Use the emergency power off button only in case of real emergency.
