Firmware Manual

9000X AF Drives
8-2 For more information visit: www.eaton.com
MN04004001E
August 2010
Description of Parameters
Figure 8-1: Linear and Squared Change of Motor Voltage
107 Current limit (P1.5, P1.1.5)
This parameter determines the maximum motor current from the frequency
converter. The parameter value range differs from size to size.
108 V/Hz ratio selection 234567 (P1.6.3)
Linear:
0 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
nominal voltage is supplied to the motor. A linear V/Hz ratio should
be used in constant torque applications. This default setting should
be used if there is no special need for another setting.
Squared:
1 The voltage of the motor changes following a squared curve form with
the frequency in the area from 0 Hz to the field weakening point where
the nominal voltage is supplied to the motor. The motor runs under
magnetized below the field weakening point and produces less torque
and electromechanical noise. A squared V/Hz ratio can be used in
applications where the torque demand of the load is proportional to
the square of the speed, e.g. in centrifugal fans and pumps.
Programmable V/Hz curve:
2 The V/Hz curve can be programmed with three different points. A
programmable V/Hz curve can be used if the other settings do not
satisfy the needs of the application.
U[V]
f [Hz]
Linear
Squared
Un
ID603
Default: Nominal
Voltage of the Motor
Field Weakening
Point
Default: Nominal
Frequency of the
Motor