Parameters
vacon • 183
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P3.24.3.6
I
DENTIFICATION
P3.24.3.7
I
DENTIFICATION
F
REQUENCY
When active, identification adjust the value of P3.24.3.3, to align the conditions of low irradiation
and desired minimum power from the PV modules (defined as minimum frequency, set in
P3.24.3.7).
If irradiation goes below P3.24.3.3, but present motor frequency is higher than P3.24.3.7, than the
value in P3.24.3.3 is reduced. This will avoid switching to AC, when the power from PV modules is
still enough.
On the other hand, if irradiation is still higher than P3.24.3.3, but MPPT regulation decreases the
frequency below P2.24.3.7, present irradiation value is used to update P3.24.3.3. This will activate
the AC switching On.
Mode 2 Sensorless
In mode 2, relay for AC supply is activated when the pump is running below a certain speed.
AC relay is switched On also in case of Low Power alarm at start or Under voltage fault. And in case
DC voltage was already below the threshold (M3.24.1.1 + P3.24.1.4) when external Start command
is given.
With AC connected, MPPT will reach the maximum motor speed. Power is shared between AC grid
and PV modules, according to their actual capacity.
In this condition, DC voltage stays naturally close to rectified AC voltage (V3.24.1.1).
DC voltage will increase in case the modules can sustain the needed full power.
If the threshold (V3.24.1.1 + P3.24.1.4) is reached, AC is switched Off.
Besides this, when AC switch is On, the drive periodically decreases the motor speed to a program-
mable level, to check if PV modules can sustain at least that reduced power. If DC voltage has in-
creased above the threshold, AC is switched Off. Otherwise MPPT will go back to max speed. This
DC voltage check can be disabled by digital input (RTC channel possibility).
P3.24.4.1
AC O
N
F
REQUENCY
AC relay is switched On if motor frequency stays below threshold, for delay time.
P3.24.4.2
AC O
N
D
ELAY
AC relay is switched On if motor frequency stays below threshold, for delay time.
P3.24.4.3
DC C
HECK
R
EFERENCE
Frequency reference at which DC voltage is checked, for possible switching Off. Higher values
mean to use PV modules alone only if they have a good power availability.
P3.24.4.4
DC C
HECK
P
ERIOD
Time for periodic DC voltage check, at reduced frequency. It can be disabled by means of digital in-
put set in P3.5.1.60. This can be connected to RTC channels, for time of the day related actions.
P3.24.4.5
DC C
HECK
S
TABILIZATION
T
IME
DC voltage must stay above the threshold for this time (both at maximum and reduced speed), to
activate AC switching Off.
