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Example: the three phases measure 383, 386 and 392 V respectively. The average is:
383 + 386 + 392
3
= 387 𝑉
The unbalance percentage is:
(392 − 387) ∗ 100
387
= 𝟏. 𝟐𝟗 %
less than the maximum allowed (3%).
8
OPERATION
8.1
Operator’s responsibilities
It is essential that the operator is appropriately trained and becomes familiar with the system before operating the unit. In
addition to reading this manual, the operator must study the microprocessor operating manual and the wiring diagram in
order to understand start-up sequence, operation, shutdown sequence and operation of all the safety devices.
During the unit’s initial start-up phase, a technician authorized by the manufacturer is available to answer any questions
and to give instructions as to the correct operating procedures.
The operator must keep a record of operating data for every installed unit. Another record should also be ke pt of all the
periodical maintenance and servicing activities.
If the operator notes abnormal or unusual operating conditions, he is advised to consult the technical service authorized
by the manufacturer.
