Microdrive Series Instruction Manual
4201-109 Rev I
56
25 MINIMUM FLUX
Screen 25 MIN FLUX=100%
Description DYNAFLUX MINIMUM FLUX LEVEL
Min/Max 40/100
Units %V(MOTOR)
FUNCTION Sets the minimum flux level that the motor will
be operated at under reduced load conditions.
The Microdrive incorporates the Dynaflux
(dynamic flux) automatic motor flux optimising
system. This system is particularly useful for
reducing noise and power loss by automatically
reducing motor flux levels (and so losses and
noise), in reduced load situations.
SETTING UP If the flux reducing feature is not required,
leave set at 100% (factory set value).
Dynaflux is best suited for slowly varying
loads (e.g., pump and fan). This is due to the
possibility of motor stall, upon a rapid load
increase at a time when there is insufficient
fluxing.
For fan and pump (or similar) loads, set to the
lowest value, consistent with reliable operation.
Usually 40% will be suitable.
Using a value which is too low can lead to
instability or surging. If this occurs, increase
the minimum flux level.
Selecting intermediate levels of minimum
fluxing caters for more dynamic loads with
reduced amounts of Dynaflux action.
Set the minimum flux level to 100% for highly
dynamic loads (e.g., servos and cranes).
25
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