37
or co-generation systems. It is however necessary to check the correct CT connection by
making sure the decimal point of the cosf measurement is not flashing with energy import
conditions. If not, the CT connections (S1 and S2 terminals) must be inverted or more
simply set Inverse.
WARNING! Before disconnecting the S1 and S2 terminals, check that the CT secondary
terminals are shorted.
P.13 - Mains frequency recognition
Automatic selection, fixed 50Hz or fixed 60Hz.
P.14 - Step power adjustment
When this function is enabled and during normal operation, the unit allows automatic
measurement of the power rating of the steps and modification of the operating parame-
ters in case the steps are worn (i.e. by making many operations).
Note:
− When this function is used, the time between the connection of one bank and the next
is 20 seconds.
− If the automatic set-up is used, the function is automatically enabled.
P.15 - Standard or Band regulation mode
In Standard mode, the controller adjusts the system cosf to the set value. In Band mode,
the capacitors are connected when the system cosf is lower than the set value and are
disconnected when in capacitive conditions. The Band mode is used to further reduce the
number of capacitor connections and disconnections.
Note: The Band mode configuration does not allow programming of capacitive cosf .
P.16 - Standard or Linear connection mode
In Standard mode, the controller freely selects the steps according to the logic described
in the Automatic operation section above. In Linear mode, the steps are connected only
by progression from left to right following the step number and according to the LIFO (Last
In First Out) logic. The controller will not connect a step when the system steps are of dif-
ferent power ratings and by connecting the next step, the set-point value would be ex-
ceeded.
P.17 - Co-generation cosϕ set-point
This parameter is programmed when a 4-quadrant operation is required, i.e. when the
system is in the condition of consuming or producing energy. When the parameter is set
to OFF, the cosf set-point is the only one and corresponds to the value programmed with
SET COSf (see page 34). On the other hand, when it is set to a numeric value then the
set-points are two: under normal conditions (system consumes mains energy, positive
cosf ), the set-point value is considered as programmed by SET COSf .
Under co-generation conditions (system produces energy, negative cosf ), it is used as
programmed to P.17.
P.18 - Disconnection sensitivity
With this parameter at OFF, the sensitivity value set to P.05 (see basic menu) adjusts the
reactive speed during both the connection and disconnection phases. However, if P.18 is
set to a different value, the programmed value of P.05 is considered for the connection
while the value P.18 is used for the disconnection of the steps.
P.19 - Step disconnection at change to MAN mode
When this parameter is enabled, the connected steps are disconnected in sequence
when changing from AUTO to MANU mode. At the end of the disconnection, the normal
manual mode function is restored.
P.20 - Capacitor overload alarm threshold
By using this parameter, it is possible to adjust the tripping threshold of alarm Capacitor
Overload. The percentage of current flowing in the capacitors (calculated by the waveform
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