Navigate to the FLD. CTRL MODE parameter by repeatedly pressing the
key.
Press
M
to edit the parameter.
Verify this is set to VOLTAGE CONTROL or CURRENT CONTROL. Press
or
to select.
Press
E
to exit.
Now navigate to the following parameter and use the
M
,
and
E
keys, as above, to enter your value.
CONFIGURE DRIVE
FLD. VOLTS RATIO
- Skip if in Field Current mode -
Calculate and enter ratio where
FLD. VOLTS RATIO = (Motor Nameplate Field Volts ÷ AC Supply ) × 100
For example, 300 VDC ÷ 460 VAC × 100 = 65%
Field Voltage Control:
a. Measure the field voltage on terminals F– and F+ and verify that it equals the motor nameplate rating.
b. Adjust CONFIGURE DRIVE::FLD. VOLTS RATIO until the voltage equals field voltage rating on the motor nameplate label.
NOTE The DC motor field impedance increases with temperature, therefore the field current of a motor in voltage control can read higher than the
nameplate rating when the field is initially powered. The current should fall to its nominal value as the motor warms up.
Field Current Control:
NOTE FLD CTRL MODE IS must be set to CURRENT CONTROL when operating the motor in field weakening mode.
a. Measure the motor field current if a Hall effect current meter and adjust SETUP PARAMETERS::CALIBRATION::FIELD I CAL until the
measured field current equals the field current rating on the motor nameplate label.
3. Stop the drive.
4. If any changes were made to the drive's parameters settings, PARAMETER SAVE.
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