Baldor 18H Series, Инструкция по установке и эксплуатации

Страница: 106 / 146

Section 6
Manual Tuning the Series 18H Control
Manual Tuning the Series 18H Control 6-1 MN718
Manually Tuning the Control
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.
Motor Mag Amps Parameter
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).
Slip Frequency Parameter
This parameter is located in the Level 1, Vector Control Block. The slip frequency
may be calculated from nameplate data or auto tuned.
F
slip
+
Rated Freq
*
ƪ
(Rated RPM x Number of Motor Poles)
120
ƫ
OR
F
slip
+
Rated Freq
*
ǒ
Base Speed
Sync Speed
Ǔ
(Rated Freq)
Current Prop Gain Parameter
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:
Current PROP Gain
+
ƪ
740 x L x
ǒ
A
ń
V
Ǔ
ƫ
VAC
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.