THORLABS BBD301, User Manual

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Chapter 6
HA0409T Rev B Aug 2021
Page 56
6.3.4 Advanced - Misc. Tab
Fig. 6.6 Advanced Miscellaneous Settings
Motor Output Settings
Current Limit – The system incorporates a current 'foldback' facility, whereby the
continuous current level can be capped. The Current Limit parameter, accepts values as
a percentage of maximum peak current, in the range 0% to 100%, which is the default
maximum level set at the factory (this maximum value cannot be altered).
Energy Limit – When the current output of the drive exceeds the limit set in the Current
Limit parameter, accumulation of the excess current energy begins. The Energy Limit
parameter specifies a limit for this accumulated energy, as a percentage of the factory set
default maximum, in the range 0% to 100%. When the accumulated energy exceeds the
value specified in the
Energy Limit parameter, a 'current foldback' condition is said to exist,
and the commanded current is limited to the value specified in the Current Limit parameter.
When this occurs, the Current Foldback status bit (bit 25) is set in the Status Register and
the ‘Current Limit’ LED on the GUI panel is lit. When the accumulated energy above the
Current Limit value falls to 0, the limit is removed and the status bit is cleared.
Motor Limit – This parameter sets a limit for the motor drive signal and accepts values in
the range 0 to 100% (32767). If the system produces a value greater than the limit set, the
motor command takes the limiting value. For example, if the
Motor Limit is set to
The default values programmed into the APT software will give acceptable
performance in most cases. The following parameters are set according to
the stage or actuator type associated with the driver and have already been
optimized. Changing these parameters can result in control instability and
possible damage. Use extreme caution if adjusting these parameters.
Caution