FXM5 User Guide
23
Issue Number: 5
www.controltechniques.com
Figure 4-9 Locations of the controls and indicators on the front panel
4.7.1
Maximum current
Apply AC power to the FXM5 controller. Do not start the motor running.
Monitor the LED bar indicator and adjust the SET MAX FIELD potentiometer to set the
current at the required proportion of I
F
max. Check that the I
F
max LED is lit.
Note that the LED bar indicator relates to the absolute maximum current that can be
produced by the controller as determined by the setting of jumper LK1 and the number
of primary-winding turns in the DCCT. The absolute maximum current is defined as
I
F
max. The title I
F
max on the LED above the SET MAX FIELD potentiometer relates to
the maximum required current set using the potentiometer, not the absolute maximum
current of the FXM5 controller.
4.7.2
Minimum current
1.
Press the TEST switch continuously. The LED bar indicator now shows the
proportion of current set using the SET MAX FIELD potentiometer.
2.
Monitor the LED bar indicator and adjust the SET MIN FIELD potentiometer to set
the current at the required proportion of the maximum level. Check that the I
F
min
LED is lit.
The value of minimum field current that can be set is between 0.1 and 0.9 of the
maximum. The minimum current should be set to either of the following:
•
To just below the field current required for the maximum speed (e.g. for double
the base-speed, set the SET MIN FIELD potentiometer for just below half the
current set using the SET MAX FIELD potentiometer. The field-failure relay
will be de-energized when the field current reduces to the level set using the
SET MIN FIELD potentiometer.
•
To define a level for the field-failure relay to be de-energized, independently of
the minimum required field current.
3.
Release the TEST switch.
4.
Remove AC power from the FXM5 controller and from the field winding of the motor.
4.7.3
Fixed field current
Use the procedure given above to set the maximum field current. Set the minimum field
current at a level for the field-failure relay to be de-energized.
Set the MAX ARM V potentiometer at the fully clockwise position.
SET
MAX
FIELD
SET
MIN
FIELD
SET
MAX
ARM V
I max
F
I min
F
TEST
I max
F
1.0
0
0.8
0.6
0.4
0.2
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