5
vacon • 35
BASIC VARIANTS
Tel. +358 (0) 201 2121 • Fax +358 (0)201 212 285
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Charging can be achieved by upper system control or simply by Value ID Control functions.
Charging will start automatically when the DC/DC converter overvoltage limit is reached
even without charging reference.
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When the grid converter power flow is parallel to the grid, the DC-Link voltage will go down
until it reaches the DC/DC converter undervoltage level, where the voltage remains until the
DC/DC converter discharging current limit is reached.
Figure 36. Charging and discharging
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AFE-operation mode.
o Not practical. Could be possible when DC/DC operated with under voltage control with a
drooping. But DC reference changes makes steep power changes.
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Island-operation mode
o Power control not possible, drive will give to the grid what the grid needs.
o Cannot operate parallel with other power sources.
o Makes a grid but cannot synchronize to an existing one.
DC
OV Level
uG
OV Level
uG
UV Level
DC
UV Level
Discharging
Controlled charging possible
Current limit charging
Summary of Contents for NX6
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