apfiff09 marine
VACON®
•
201
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
Classified as Public
7.8.3.1
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. I/f-control is activated by setting AdvancedOptions2.B9 = 1 (P2.10.6) for PM-motors.
Also software modulator is required.
Motor Current
Time [s]
I/f Control
Limit
I/f Start Current
Output Frequency
P2.8.6.6
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.
P2.8.6.7
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.
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