Instruction manual

13
9) Measure TB1-9-10, and adjust TACH GAIN, P1, to get 12.25VDC.
10) Stop the armature control. Press the MIN FIELD SET button and set P3, MIN
FIELD CURRENT, to the weakened field current. Release the button and set P4,
MAX FIELD CURRENT, to the base field current level.
11) Re-start the armature supply and slowly increase the speed reference to make the
armature voltage equal to about 92% of the base, maximum, armature volts.
12) Decrease the P5 (CROSSOVER SET POINT) to the level where the I6, FIELD
WEAKENED, light just turns on. Stop at that point. Stop the control and remove
all power.
13) Select Tach Feedback on the armature control. On the FR3500-000, put J3 in
AUTO.
NOTE: Closely monitor the motor speed during the next step. If the speed is unstable go
to step 15 to adjust out this instability.
14) Re-apply power and start the control with the speed reference at zero. Slowly raise
the speed and watch the field current and armature voltage. When the armature
voltage reaches the crossover level, (92%), the field current will begin to decrease.
As the speed reference is increased to maximum, the field current will decrease to
the minimum level. With tachometer feedback, the speed will be proportional to
the speed reference. Adjust the max speed pot on the armature control to get the
speed range desired. Do not exceed the nameplate armature voltage. If the
operation is stable, set-up is complete.
15) With the speed reference fixed at an unstable point try to adjust the armature
velocity and current tuning adjustments. If this is not successful, stop the motor,
remove AC power from the Field Regulator and move the J2 jumper to the
“SLOW” position. Restart the motor and if necessary, retry the armature velocity
and current tuning adjustments. When the speed is steady go back to step 14.