Programming and Parameters 3-37
PowerFlex 40 Adjustable Frequency AC Drive FRN 1.xx - 7.xx User Manual
Publication 22B-UM001I-EN-E
Advanced Program Group (continued)
A127 [Autotune] Related Parameter(s): A125, A126, A128, A129
Stop drive before changing this parameter.
Provides an automatic method for setting A128 [IR Voltage Drop] and A129 [Flux Current Ref], which
affect sensorless vector performance. Parameter A126
[Motor NP FLA] must be set to the motor
nameplate full load amps before running the Autotune procedure.
Options 0 “Ready/Idle” (Default)
1 “Static Tune”
2 “Rotate Tune”
“Ready” (0) = Parameter returns to this setting following a “Static Tune” or “Rotate Tune.”
“Static Tune” (1) = A temporary command that initiates a non-rotational motor stator resistance test for
the best possible automatic setting of A128 [IR Voltage Drop]. A start command is required following
initiation of this setting. The parameter returns to “Ready” (0) following the test, at which time another
start transition is required operate the drive in normal mode. Used when motor cannot be uncoupled
from the load.
“Rotate Tune” (2) = A temporary command that initiates a “Static Tune” followed by a rotational test
for the best possible automatic setting of A129 [Flux Current Ref]. A start command is required
following initiation of this setting. The parameter returns to “Ready” (0) following the test, at which time
another start transition is required to operate the drive in normal mode. Important: Used when motor
is uncoupled from the load. Results may not be valid if a load is coupled to the motor during this
procedure.
If the Autotune routine fails, an F80 SVC Autotune fault is displayed.
ATTENTION: Rotation of the motor in an undesired direction can occur during this
procedure. To guard against possible injury and/or equipment damage, it is
recommended that the motor be disconnected from the load before proceeding.
A128 [IR Voltage Drop] Related Parameter(s): A127
Value of volts dropped across the resistance of the motor stator.
Values Default: Based on Drive Rating
Min/Max: 0.0/230.0 VAC
Display: 0.1 VAC
A129 [Flux Current Ref] Related Parameter(s): A127
Value of amps for full motor flux.
Values Default: Based on Drive Rating
Min/Max: 0.00/[Motor NP FLA]
Display: 0.01 Amps
22B-UM001.book Page 37 Tuesday, May 30, 2017 5:22 PM
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