Newport New Focus Picomotor 8743-CL User Manual page 88

88
DB
Deadband set.
Description
xxDBnn
Syntax
This command is used to set the position deadband value for an axis. Since a majority of
Remarks
electro-mechanical systems have mechanical backlash or frictional hysteresis, closed-loop
positioning can at times lead to oscillation or limit cycling of the systems around a desired
position. In such situations, setting position deadband value judiciously can avoid limit cycling
of the systems.
Note that this command is effective only during position regulation (holding position) as
opposed to while moving. Also, the positioning units must be in 'Counts' (see SN command)
and closed-loop positioning must be enabled (see MM command) for DB command to take
effect.
NOTE: An error will be generated if the controller makes more than 100 consecutive
Argument
xx
nn
2DB0
Example
2SN1
2FE1000
2CL0.1
SM
2MM1
2PA+100
DB?, SN, MM, FE, CL
See Also
unsuccessful attempts to correct the stage position, but is unable to bring the
following error to within specified deadband setting.
Value
1 to 2
0 to 2147483647 Deadband value (units). Default = 0
(set deadband value to 0 encoder counts)
(set units to encoder counts)
(set following error threshold to 1000 counts)
(set closed-loop update interval to 0.1 second)
(save settings to non-volatile memory)
(enable closed-loop positioning)
(move to encoder count position +100)
Description
Axis number