Parameter description
vacon • 80
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4
4.13.2.5
MPPT Oscillation Damping
If the power regulation enters the “current source” branch of the panel current/voltage char-
acteristic, the typical result is a oscillation in DC voltage and output frequency. The damping
logic recognizes oscillation in DC voltage and quickly increases the voltage reference correc-
tion term. This brings the panels back in “voltage source” branch.
P14.18 D
AMPING
SENSITIVITY
P14.18 parameter determines the amplitude of oscillation, to be recognized.
If the value is too low, normal variation in voltage level could be considered oscillation, and the
DC voltage reference incorrectly increased.
P14.19 D
AMPING
TIME
Oscillation is recognized when the logic sees three maximum and minimum point during the
time defined by P14.19.
If the time is too short, the logic could fail with slow oscillations.
If the time is too long, spaced and unrelated min and max points could be confused with an os-
cillation.
P14.20 S
LEEP
IN
SOLAR
MODE
This parameter enables or disables the sleep fuction:
0: Disabled
1: Managed with P12.12 and P12.13
When P14.20 =1, the drive will stop if the output frequency is below the value in P12.12, for the
time in P12.13. It will restart as after a stop due to low power.
Sleep function allows to program a minimum frequency P1.1 that is below the efficient range
of the pump. MPPT can reach this low value, leading to a minimum output power and avoiding
to stop the drive in case of temporary reduced irradiation. If the condition persists, sleep logic
will then stop the drive.
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