LAM Technologies DS10 Series, User Manual

Page: 41 / 72

DS10xx Functionality and Setting
41
The following diagram shows the relation between pulses applied to the
STEP input and the automatic current reduction.
After the last STEP input disable/enable transition the
Tir time starts to
pass, after which the automatic current reduction intervenes to reduce the
phase current, in the example, to the 60% of the nominal value (read at the
set configuration value).
The BOOST input allows to manually reduce the current even while motor
is rotating. This feature can be useful to reduce the heating when the whole
torque supplied by the motor is not required (for example when the load
moves at constant speed).
Through the DIRECTION input it is then possible to suspend the automatic
current reduction. A commutation from the enable to the disable status sets
to zero the timer used for the automatic current reduction intervention.
Therefore, changing the DIRECTION input with a time inferior to
Tir
(time set for the automatic current reduction) the reduction never
intervenes, maintaining the motor always supplied by the nominal current.
100%
60%
STEP
Tir
Phase current
Pulses
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