Walker Magnetics SMART-D SERIES - Manual (Page 17)

O.S. WALKER Co., Inc. SMART-D Control
SMART D MANUAL DD14511L Rev. L, March 30, 2011
4-3
4.2 Full Holding
(Green Push-Button)
In the Full holding position, full output voltage is supplied from the control to the chuck as
soon as this function is selected. The indicator light for the Full holding position is illuminated
when this function is selected.
NOTE: Full holding has equivalent holding force to 100% on the Variable holding
control knob.
4.3 Variable Holding
(White Push-Button)
When the operator presses the Variable holding button, the output voltage of the control can
be adjusted from zero to full with the Variable control knob.
A varying amount of Residual hold can be achieved by turning the Variable control knob to
zero from its previous holding position without pressing the Residual button.
4.4 Residual Holding
The output of the control is reduced to zero when this function is selected. The control turns
the chuck fully ON for a short period of time, thus leaving a recognizable residual holding
power in the chuck; this is called True Residual. During this brief pulse, the indicator light, will
be ON until another function is selected.
4.5 Release
Selecting the Release function initiates an automatic release cycle. During the release cycle,
the output voltage produced by the control is reduced from full to zero in a predetermined
number of equal pulses (see Figure 4-1). The polarity of these pulses alternately reverses
from negative to positive as the magnitude of the voltage decreases. The SMART-D can
generate a maximum of sixteen pulses per release cycle, but is set at the factory for eight.
The Release indicator light will flash ON and OFF to show that release is taking place, and
will remain ON when the cycle is complete.
The duration of each pulse is automatically controlled. The time between pulses is
automatically adjusted by the control for the optimum Release cycle time.
The SMART-D has an external and internal adjustment for the number of pulses per Release
cycle. This adjustment allows the operator to select the number of pulses it takes to get the
fastest, most complete release of a part.