ABB BUE Manuale di manutenzione - Pagina 3

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ABB BUE Manuale di manutenzione
Recommended practices
ABB recommends careful consideration of the following
factors when installing on-load tap-changers:
Before you install or commission a unit, make sure that the
personnel doing the job have read and fully understood the
Installation and commissioning guide provided with the unit.
To avoid damaging the unit, never exceed the operating limits
stated in delivery documents and on rating plates.
Do not alter or modify a unit without first consulting ABB.
Follow local and international wiring regulations at all times.
Use only factory-authorized replacement parts and
procedures.
WARNING, CAUTION and INFO
WARNING
WARNING indicates an imminently hazardous
situation which if not avoided, will result in death or
serious injury. This signal word is to be limited to the
most extreme situations.
WARNING also indicates a potentially hazardous
situation which if not avoided, could result in death or
serious injury.
CAUTION
CAUTION indicates a potentially hazardous situation
which if not avoided, may result in minor or moderate
injury. It may also be used to alert against unsafe
practices.
CAUTION may also indicate property-damage-only
hazards.
INFO provides additional information to assist in
carrying out the work described and to provide
trouble-free operation.
Safety precautions
WARNING
The maintenance guide should be read and
understood before any work is started, and the
procedures in the document should be followed at all
times.
WARNING
Before starting any work inside the motor-drive
mechanism, the auxiliary power must be switched off.
N.B. The motor, the contactors and the heating
element may be energized from separate sources.
During service
WARNING
Small amounts of explosive gas might come out
from the breathing devices (dehydrating breather
or one-way breather). Make sure that no open
fire, hot surfaces or sparks occur in the immediate
surroundings of the breathing devices.
WARNING
If a failure in power supply occurs during operation,
the operation will be completed when the power
returns.
WARNING
The hand crank must not be inserted during electrical
operation.
WARNING
If the tap-changer is not in its exact position and the
hand crank is pulled out, the motor-drive mechanism
will start and run to the exact position if the power
supply is on.