62 • vacon description of parameters
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603 Voltage at field weakening point
(2.5.5)
Above the frequency at the field weakening point, the output voltage remains at the set
maximum value. Below the frequency at the field weakening point, the output voltage
depends on the setting of the U/f curve parameters. See parameters ID109, ID108, ID604
and ID605.
When the parameters ID110 and ID111 (nominal voltage and nominal frequency of the
motor) are set, the parameters ID602 and ID603 are automatically given the correspond-
ing values. If you need different values for the field weakening point and the maximum
output voltage, change these parameters after setting the parameters ID110 and ID111.
604 U/f curve, middle point frequency
(2.5.6)
If the programmable U/f curve has been selected with parameter ID108 this parameter
defines the middle point frequency of the curve. See Figure 3.
605 U/f curve, middle point voltage
(2.5.7)
If the programmable U/f curve has been selected with the parameter ID108 this para-
meter defines the middle point voltage of the curve. See Figure 3.
606 Output voltage at zero frequency
(2.5.8)
If the programmable U/f curve has been selected with the parameter ID108 this para-
meter defines the zero frequency voltage of the curve. NOTE: If the value of parameter
ID108 is changed this parameter is set to zero. See Figure 3.
607 Overvoltage controller
(2.5.10)
These parameters allow the under-/overvoltage controllers to be switched out of opera-
tion. This may be useful, for example, if the mains supply voltage varies more than –15%
to +10% and the application will not tolerate this over-/undervoltage. In this case, the
regulator controls the output frequency taking the supply fluctuations into account.
0 Controller switched off
1 Controller switched on (no ramping) = Minor adjustments of OP frequency are made
2 Controller switched on (with ramping) = Controller adjusts OP freq. up to max.freq.
608 Undervoltage controller
(2.5.11)
See par. ID607.
Note: Over-/undervoltage trips may occur when controllers are switched out of
operation.
0 Controller switched off
1 Controller switched on
609 Torque limit
(2.8.1)
With this parameter you can set the torque limit control between 0.0 – 400.0 %.
610 Torque limit control P-gain
(2.8.2)
This parameter defines the gain of the torque limit controller. It is used in Open Loop
control mode only.
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