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.
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