Danfoss Vacon NXP Applications Manual page 86

84 · vacon
Example Air Cooled AFE unit 460 A 500 Vac :
System Rated Current: 385 A (I
Current Limit: 693 A (I
Short Circuit Level:
V Over Current Trip Limit
P Short Circuit Level
P Current Limit I
P SystemRatedCurre
2.6.1.3 Short Circuit Time
The maximum time that the drive can operate against the current limit.
NOTE! The function requires a uGrid Licence (P3.2 uGrid Licence)
2.6.1.4 High Frequency Current Limit
In normal motoring drives I
enabled separately for short circuit current if current levels above I
currents are needed for air cooled units. Liquid cooled units I
limit.
The parameter can be disabled when a licence key has been given and the drive is
connected to DC (INU unit). If connected to AC grid (FC unit), this parameter must be
kept at 0 / Enable.
NOTE! The function requires a uGrid Licence (P3.2 uGrid Licence)
5
)
h
)
s
√ 2 1.25
4 * I
h
(I /I ) * 1,77
sc h
I or I
th s
SC
I
h
is for starting current. In Grid Converter case I
s
Description of parameters
319 %
Short Circuit detection
Three phase
Fault: F91 Short Circuit
P ShortCircuitTime
M Current
Figure 30.
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must be
s
50 % over load
h
is always the maximum
th