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1-29 Automatic Motor Adaptation (AMA)

Option:

Function:

[1]

Enable
complete
AMA

Performs AMA of the stator resistance R

, the

rotor resistance R

, the stator leakage reactance

, the rotor leakage reactance X

and the main

reactance X

. Do

not

select this option if an LC

filter is used between the frequency converter
and the motor.
FC 301: The Complete AMA does not include X

measurement for FC 301. Instead, the X

value is

determined from the motor database. R

is the

best adjustment method (see

1-3* Adv. Motor

Data

T4/T5 E and F Frames, T7 D, E and F Frames will
only run a Reduced AMA when the complete
AMA is selected. It is recommended to obtain the
Advanced Motor Data from the motor
manufacturer to enter into

1-31 Rotor Resistance

(Rr)

through

1-36 Iron Loss Resistance (Rfe)

for

best performance.

[2]

Enable
reduced
AMA

Performs a reduced AMA of the stator resistance
R

in the system only.

Note:

•

For the best adaptation of the frequency converter,
run AMA on a cold motor.

•

AMA cannot be performed while the motor is
running.

•

AMA cannot be performed on permanent magnet
motors.

NOTE

It is important to set motor parameter group 1-2* correctly,
since these form part of the AMA algorithm. An AMA must
be performed to achieve optimum dynamic motor
performance. It may take up to 10 min, depending on the
power rating of the motor.

NOTE

Avoid generating external torque during AMA.

NOTE

If one of the settings in parameter group 1-2* is changed,

1-30 Stator Resistance (Rs)

1-39 Motor Poles

, the advanced

motor parameters, will return to default setting.

NOTE

AMA will work problem-free on 1 motor size down, typically
work on 2 motor sizes down, rarely work on 3 sizes down
and never work on 4 sizes down. Please keep in mind that
the accuracy of the measured motor data will be poorer
when you operate on motors smaller than nominal VLT size.

3.3.4 1-3* Adv. Motor Data

Parameters for advanced motor data. The motor data in

1-30 Stator Resistance (Rs)

1-39 Motor Poles

must match the

relevant motor in order to run the motor optimally. The
default settings are figures based on common motor
parameter values from standard motors. If the motor
parameters are not set correctly, a malfunction of the
frequency converter system may occur. If the motor data is
not known, running an AMA (Automatic Motor Adaptation)
is recommended. See the

Automatic Motor Adaptation

section in the Design Guide. The AMA sequence will adjust
all motor parameters except the moment of inertia of the
rotor and the iron loss resistance (

1-36 Iron Loss Resistance

(Rfe)

Parameter groups 1-3* and 1-4* cannot be adjusted while
the motor is running.

130BA065.12

P 1-30

P 1-33

P 1-34

P 1-31

P 1-35

P 1-36

2δ

1δ

Illustration 3.1 Motor equivalent diagram for an asynchronous
motor

NOTE

A simple check of the X1 + Xh sum value is to divide the line
to line motor voltage by the sqrt(3) and divide this value by
the motor no load current. [VL-L/sqrt(3)]/I

= X1 + Xh. These

values are important to properly magnetize the motor. For
high pole motors it is highly recommended to perform this
check.

1-30 Stator Resistance (Rs)

Range:

Function:

Application
dependent

[Application
dependant]

Set the stator resistance
value. Enter the value from a
motor data sheet or perform
an AMA on a cold motor.

1-31 Rotor Resistance (Rr)

Range:

Function:

Application
dependent