
Core Software Operation
ADDvantage-32 PLUS ● AC to DC Power Converter
3-27
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W A R N I N G
DISABLING THE FIELD CONTROL DISABLES THE ADD-32
PLUS FIELD LOSS PROTECTION. THIS MAY CAUSE THE
MOTOR TO OVERSPEED WHEN APPLYING THE ADD-32
PLUS ON A SEPARATELY EXCITED DC MOTOR.
EXTERNAL PROTECTION SHOULD BE PROVIDED TO
PROTECT AGAINST OVERSPEED AND/OR LOSS OF FIELD.
THE PROTECTION SHOULD CAUSE THE ADD-32 PLUS TO
FAULT WHEN ANY SUCH EXTERNAL PROTECTION
BECOMES ACTIVE.
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For example, an ADDvantage-32 PLUS rated for 56 ADC will be used to operate a motor
with a 40 ADC armature and a 2 ADC field. Set up the parameters for this motor as
follows.
1. Enable Y***:FIELD CNTRL.
2. Calculate X***:MOTOR IARM as follows:
%100
ADC56
ADC40
IARMMOTOR:***X ×=
X***:MOTOR IARM = 71.43%
3. An ADDvantage-32 PLUS rated at 56 ADC can provide a maximum of 6 ADC to
a motor field. Calculate X***:MOTOR IFLD as follows:
%100
ADC6
ADC2
IFLDMOTOR:***X ×=
X***:MOTOR IFLD = 33.33%
X***:MFLD %SCALE is a scaling factor for percentage field amps vs. feedback CT
voltage. The UL field supply for the 180 amp drive needs this changed to 1.0416.
(Chassis P/N D22976, included in all new drives). For AFM applications, the drive
expects 2 volts feedback equal to 100% field bridge current. Adjust this parameter to
correct the percentage; e.g., if 1 volt = 100%, enter (2 volts/1 volt) = 2.
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