Baldor 23H Series, Installation & Operating Manual

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Improper Motor Operation
Wrong Response to Speed Commands
Input common mode voltage may be exceeded. Maximum common mode voltage at terminals J1-4
and J1-5 is ± 15 volts relative to chassis common. Connect control input source common to the
control common to minimize common mode voltage.
MANUALLY TUNING THE CONTROLLER
Occasionally the controller cannot be accurately auto-tuned for a particular system. In these cases it
is necessary to calculate the values needed to tune the controller.
Current Prop Gain Parameter
This parameter is located in the Level 1, Brushless Control Block. The Current Prop Gain parameter
is normally preset for pre-tuned systems or auto-tuned where motor parameters aren't known.
Where auto-tuning can't be used, the proper manual setting for the proportional gain can be
calculated by:
Current Prop Gain = [740 x L x (A/V)]
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.
Current Int gain Parameter
This parameter is located in the Level 1, Brushless Control Block. The Current Int Gain parameter is
factory preset at 50 hz. This setting is suitable for essentially all systems.
DO NOT CHANGE
WITHOUT FACTORY APPROVAL.
4-13 DIAGNOSTIC INFO AND TROUBLESHOOTING
MN723H-10/95 11/28/95 1:14 AM Page 97 (Black plate)