PowerFlex Digital DC Drive User Manual -
Publication 20P-UM001C-EN-P - July 2008
C-34
Application Notes
Field Current Curve Tuning Procedure:
1.
Reset the field current curve by setting Par 920 [Reset Fld Curve] to “1”.
2.
Configure the following parameters:
❏
Enter the percentage (100%) of the maximum motor nameplate
rated armature voltage in Par 921 [Out Volt Level]
❏
Set Par 469 [Field Mode Sel] = 0 “Base Speed”
❏
Set Par 467 [Max Fld Curr Pct] = 100%
3.
Start the drive.
4.
Increase the motor speed until the value (electromotive force) displayed in Par
233 [Output Voltage] corresponds to the value previously set in Par 175 [Rated
Motor Volt].
5.
Decrease the value of Par 467 [Max Fld Curr Pct] until the value displayed in
Par 233 [Output Voltage] is equal to 90% of Par 175 [Rated Motor Volt]. When
you have reached this value, read the value displayed in Par 234 [Fld Current
Pct] and enter the value into Par 918 [Fld Const 90 Pct].
6.
Decrease the value of Par 467 [Max Fld Curr Pct] until the value displayed in
Par 233 [Output Voltage] is equal to 70% of Par 175 [Rated Motor Volt]. When
you have reached this value, read the value displayed in Par 234 [Fld Current
Pct] and enter the value into Par 917 [Fld Const 70 Pct].
7.
Decrease the value of Par 467 [Max Fld Curr Pct] until the value displayed in
Par 233 [Output Voltage] is equal to 40% of Par 175 [Rated Motor Volt]. When
you have reached this value, read the value displayed in Par 234 [Fld Current
Pct] and enter the value into Par 916 [Fld Const 40 Pct].
8.
Stop the drive.
9.
Set the desired method of field control in Par 469 [Field Mode Sel] (0 “Base
Speed” or 1 “Field Weaken”)
10. Reset the value of 467 [Max Fld Curr Pct] to 100%.
If you change the value of Par 175 [Rated Motor Volt] or par 280 [Nom Mtr
Fld Amps], the field current curve will need to be re-tuned.
