Manual Tuning The Series 22H Control; Manually Tuning The Control; Motor Mag Amps Parameter; Slip Frequency Parameter - Baldor 22H series Installation & Operating Manual

Section 6

Manual Tuning the Series 22H Control

Manually Tuning the Control

Motor Mag Amps Parameter

Slip Frequency Parameter

Current Prop Gain Parameter

MN722
In some applications the drive cannot be accurately auto-tuned in an application. In
these cases it is necessary to calculate the values needed to tune the drive and manually
enter these calculated parameter values.
This parameter is located in the Level 2, Motor Data Block. This parameter is
normally entered using the nameplate data (motor no load amps) or auto–tuned. If no
other data is available, set Motor Mag Amps parameter to about 40% of the motor rated
current stated on the nameplate.
The following procedure should be used for setting the Motor Mag Amps parameter with
the motor coupled to the load:
1. Adjust the Motor Mag Amps Parameter to 40% of the motor nameplate full load
current rating.
2. Give the controller a speed command input of 80% of the Base Speed on motor
nameplate.
3. Select motor voltage on keypad display by pressing the DISP key until the
motor voltage value is displayed.
4. Observe the motor voltage. Ideally, it should read 80% of motor nameplate
voltage. By raising the Motor Mag Amps parameter value, the motor voltage
will raise proportionally. Continuing to raise the Motor Mag Amps parameter
value will eventually saturate the motor voltage. By lowering the Motor Mag
Amps parameter value, the motor voltage will lower proportionally.
5. While the motor is running adjust the Motor Mag Amps parameter until the
display indicates the proper voltage (80% of motor rated).
This parameter is located in the Level 1, Vector Control Block. The slip frequency
may be calculated from nameplate data or auto tuned.
(Rated RPM x Number of Motor Poles)
+ Rated Freq
F
slip
Base Speed
+ Rated Freq
F
slip
Sync Speed
This parameter is located in the Level 1, Vector Control Block. The Current Prop
Gain parameter is normally auto–tuned when motor inductance is not known. Where
auto–tuning can't be used, the proper manual setting for the proportional gain can be
calculated by:
740 x L x A V
Current PROP Gain +
Where:
L = Line to neutral leakage inductance of the motor in mH
VAC = Nominal line Volts
A/V = The Amps/Volt scaling of the current feedback
Motor line to neutral leakage inductance can be obtained either from the motor
manufacturer or by measuring the line–to–line inductance and dividing by two.
The A/V scaling for the controller can be found in the diagnostic information located in the
DISPLAY MODE.
For most applications setting the Current Prop Gain parameter to a value of 20 will yield
adequate performance.
120
(Rated Freq)
VAC
Manual Tuning the Series 22H Control 6-1
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