Bticino Megabreak 2500, Installation Manual

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- Disconnect all the device electric accessories from the auxiliary circuit
• To successfully complete all the dielectric checks, set back the button in working position and
connect all the accessories
• To verify the presence and value of the voltage up-stream and down-stream the device
How to resume the device after tripping
In case during the functioning the breaker trips, the assigned personnel must respect the following
procedure:
• To indentify the reason of the release and if it is related to a protection event or an external circuit
• To check the protection unit history log (see the protection unit user manual).
• To verify the position of MAN/AUT button. If it is in MAN position after the protection unit
tripping, the RESET button is released and, to assure more safety, it’s impossible to close the
breaker. In this case the personnel must understand the reason of the fault and set back the
RESET button before start working again.
• If the button is in AUT position the device is able to close even after a protection tripping, without
any on site intervention of personnel, allowing the closing by remote if needed by the system
manager. In this case an automatic and remote system is needed.
Identification of the fault
The fault is shown locally on the protection unit and/or by the auxiliary contacts installed on the
device. In case of fault it is strongly suggested to inspect the device (see Maintenance guide)
Reasons fault
The device shouldn’t be closed again before checking and solving the cause of the fault (locally or
by remote).
The reasons may be various:
the reasons may be classified in two main types
• fault protection (see the hystory log of the protection unit)
• ST and UVR intervention
After checking the reason of the fault, before closing the device again, it’s suggested to check the
device conditions, and above all, to check the dielectric and insulation conditions of one part or the
whole device depending on the nature of the tripping event.
Those checks and tests must be requested and managed by qualified personnel according to this
user manual.
NORMAL
USE
DIELECTRIC
TEST POSITION
NORMAL
USE
TRIP
DIELECTRIC
TEST POSITION