
apfiff09 marine
VACON®
•
195
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
Classified as Public
7.8.1.1
I/f Control
I/f-control can be used to start the motor using a constant current control. This is useful especially, if
the motor stator resistance is low, which makes the motor current sensitive for u/f-curve tuning at low
speed area.
P2.8.4.8
I/f Start
ID534
Activates I/f control
Motor Current
Time [s]
I/f Control
Limit
I/f Start Current
Output Frequency
P2.8.4.9
I/f Current
ID1693
“I/f Current”
NOTE
: I/f Current parameter is used for several different purposes.
I/f Control
This parameter defines the current level during I/f control, in percent of the motor nominal
current
Zero position with incremental encoder and Z-Pulse
In closed loop control utilizing the encoder z-pulse, defines also the current level used in
starting before the z-pulse is received to synchronize with.
DC Start Angele identification
This parameter defined DC Current level when Start Angle Identification Time is set
greater than zero. See P2.8.5.5 Start Angle Identification Time.
P2.8.4.10 I/f Control Limit ID1790
“I/f Control Lim”
This parameter sets the frequency limit for I/f-control in per cent of the motor nominal
frequency. I/f-control is used if the frequency is below this limit. The operation changes
back to normal when the frequency is above this limit with 1 Hz hysteresis.
P2.8.4.11 MakeFluxTime
ID660
Time for magnetize the motor in ms. In Open Loop control drive will remain in zero speed
during this time. Using DC Brake in start will bypass Make Flux Time. During the Make
Flux Time voltage reference can be set separately, in Marine application Make Flux
Voltage is same as Zero Freq Voltage.
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