Vacon 20, Complete User'S Manual

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parameter descriptions vacon
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9
9. PARAMETER DESCRIPTIONS
On the next pages you can find the descriptions of certain parameters. The descrip-
tions have been arranged according to parameter group and number.
9.1 Motor settings (Control panel: Menu PAR -> P1)
1.7 C
URRENT LIMIT
This parameter determines the maximum motor current from the frequency
converter. To avoid motor overload, set this parameter according to the rated
current of the motor. The current limit is equal to (1.5
x
I
n
) by default.
1.8 M
OTOR CONTROL MODE
With this parameter the user can select the motor control mode. The selec-
tions are:
0 = Frequency control:
Drive frequency reference is set to output frequency without slip com-
pensation. Motor actual speed is finally defined by motor load.
1 = Open loop speed control:
Drive frequency reference is set to motor speed reference. The motor
speed remains the same regardless of motor load. Slip is compensat-
ed.
1.9 U /
F RATIO
There are three selections for this parameter:
0 = Linear:
The voltage of the motor changes linearly with the frequency in the
constant flux area from 0 Hz to the field weakening point where the
field weakening point voltage is supplied to the motor. Linear U / f ratio
should be used in constant torque applications. See Figure 9.1.
This default setting should be used if there is no special need for an-
other setting.