Every Mentor MP has a motor field
controller as standard that provides excellent field
control for the majority of DC motors. However, in
the following situations, the optional
FXMP25 external field controller
is recommended:
-
The required field current is
greater than that offered by the standard drive,
up to 25 A. For example, older motors with low
field voltages.
-
The field is required to be
forced down more quickly than is possible with a
standard half controlled field bridge. For
example, on spindle motors or motors with high
field time constants where the field is required
to weaken more quickly than the natural time
constant of the field winding.
-
FXMP25 allows applications to be
implemented with simple field current reversal,
without armature reversal. For example,
applications where a rapid change in torque
direction is not required. With the Mentor MP it
is possible to implement a four quadrant system
with a two quadrant armature converter where a
slow change in torque direction can be
tolerated.
Easy upgrade
The new FXMP25 replaces our existing
FXM5 option. It may also be controlled digitally by
a Mentor II, allowing set-up by standard drive
parameters. The FXMP25 has the same physical
dimensions as the existing FXM5, but extends its
current range to 25 A.
High current fields
For field currents above 25 A, a
separate Mentor MP DC drive can be used as a field
controller.
