Parameters vacon • 152
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6
6.2.23 Solar
6.2.23.1 Start Settings
P3.22.1.1 START DC VOLTAGE
Start enable from solar condition needs that the DC voltage is above the threshold in P3.22.1.1
(at least for 5s).
P3.22.1.2 S
HORT RESTART DELAY
The drive starts and tries to reach minimum frequency. If this doesn't happen within a defined
time, the drive will stop and retry only after the short delay time P3.22.1.2 has elapsed.
P3.22.1.3 S
HORT RESTART DELAY TRIES
P3.22.1.4 LONG RESTART DELAY
After a certain number of failed attempts (P3.22.1.3), the time between start attempts will
change to long delay time P3.22.1.4.
If the drive can run continuously for the same long delay time, next start attempts will begin
with short delay again. The same sequence is applied in case a running drive stops because of
a temporary decrease in solar power.
Note! If the drive is supplied by mains, the drive is always enabled to start from external com-
mand.
6.2.23.2 MPPT
Generally, the MPP voltage of a panel is higher when the available power is high (good irradi-
ation, low temperature).
The output power to the motor is considered an indicator of the panel state: if the drive can pro-
gressively increase motor speed and get a good amount of power, it means that the panel has
basically “high” MPP voltage.
The DC voltage reference for the regulator is automatically changed by the MPP Tracker.
It results from four parallel algorithms:
-Feed-forward controller
-Correction controller
-Oscillation damping regulator
-Local Maxima logic
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