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Rockwell Automation Publication 20P-TG001C-EN-P - February 2018
Appendix C
Flow Charts
Low or Incorrect Field Current Flow Chart
Verify Par 351 [Field
Current] value using
DC clamp to measure
the DC motor field
current.
Verify Par 280 [Nom
Mtr Fld Amps] value
matches the rated
field current value on
motor nameplate.
Is voltage
measurement
correct?
No
Yes
Using an ohmmeter,
measure the
resistance across
terminals LA-LB to
verify that the value
equals the equivalent
resistance set with
DIP switch S14.
Is resistance
measurement
correct?
Replace the field
board.
No
Yes
Verify drive rated field
bridge current is set
correctly in Par 374
[Drv Fld Brdg Cur] and
DIP switch S14 is
configured to match.
Measure field current
signal at LA-LB
terminal located on
control board. This
value should be equal
to the value of Par
374 [Drv Fld Brdg
Cur]. If these values
are equivalent, the
voltage across
terminals LA-LB
should be 1.66 VDC.
Replace the control
board.