4. Control of the automa•c opera•on
The check of the correct opera•on of the automa•c
regulator can be effected by modifying the load condi•ons in
a suitable way.
If the opera•on is not correct the reason should be founded
among one of the following errors:
· CT connected on the wrong phase (see Fig.2).
· CT installed between the equipment and the load (see
Fig.2).
· CT inserted on the supply cables of the power factor
correc•on equipment (see Fig.2).
· Defec•ve or unsuitable CT.
5.1 Connec•on in installa•on provided with power
generator (PV or co-generator)
Before carry out the verifica•on in accordance with point 5,
it is necessary to follow the following indica•ons:
1. change the se#ng parameters:
· For controller type PFC, P12 parameter, set “Dir” or
“Inv” (the value which give the correct measurement
of the Power Factor).
· For controller type PFCevo, P04 parameter, set “Dir”
or “Inv” (the value which give the correct
measurement of the Power Factor).
2. switch off the power generator un•l the verifica•on of the
PFC equipment has been completed.
3. A$er the comple•on of the PFC equipment verifica•on,
the power generator can be switched on.
5. Maintenance
Periodical check must be carried out on:
· Current drawn by every single step, in order to keep the
opera•ng condi•ons of the equipment always under
control.
· All electronic parts (reac•ve power regulator and
protec•on module, if present) in order to check their
efficiency.
· Protec•on fuses on the auxiliary circuits.
· Protec•on fuses on the capacitor banks (provided with
signal).
· The efficiency of the coolong system, checking that the
fans are not defec•ve or mechanically blocked and
cleaning with an air jet the relevamt grilles.
· The efficiency of the contactors, by replacing those which
are defec•ve and periodically checking the •ghtening of
the terminals.
· The presence of capacitors with overpressure device
tripped (these single phase units must be replaced to do
not jeopardize the performance of the complete
equipment).
This last check is par•cularly important for .../A and ../HA
where checking that the tuning frequency of the filter does
not change in the •me, is basical; even using high quality
components, it can occur that some capacitor fails causing
the trip of the overpressure safety device.
The consequent loss of capacitance may cause a change of
the tuning frequency of the filter with consequent dangerous
overloads.
In view of the above, a periodical test has to be carried out
to check the presence of capacitors with tripped
overpressure device (these have an expansion of the upper
part of the case) replacing them with new capacitors.
In order to prevent possible reduc•on of the original
capacitance values (this phenomena can involve more than a
capacitor) it is useful to check during the installa•on, a$er
the first month of opera•on and then two or three •me a
year, the current adsorbed by the banks, connec•ng them
manually with no load condi•on and taking note of the
results on the maintenance form.
Big differences in measures or eventual unbalances of the
three phases show the need of a special maintenance.
ATTENTION!
Further to the check of the correct thighteing af all the
connec"on, periodically clean the equipment inside by
removing possible dust not compa"ble with the good
opera"on of the equipment.
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