Walker Magnetics SMART-C SERIES - Manual (Page 10)

O.S. WALKER Co., Inc. SMART-C Control
SMART C MANUAL DD-14494D Rev D, March 30, 2011
4-1
3.1.1 Connecting Additional Features
SMART-C chuck controls are equipped with two optional features; Current Sensing, and
Lockout. These features enable the chuck control to work with external equipment such
as machine controls or a PLC.
3.1.1.1 Current Sensing
This control is equipped with a current sensing feature that monitors the current
flowing to the chuck and indicates when this current has
reached a predetermined value. The predetermined
value is set by adjusting the variable potentiometer to
the desired point and then pressing the residual
pushbutton while holding down the variable
pushbutton. When the preset value is reached, the Variable
indicator light stays on and the current sense relay closes. If the
current flowing to the chuck goes below the preset value, the
variable light will flash.
3.1.1.2 Lockout
A Lockout feature is supplied with this control, which prevents
anyone from accidentally changing the mode while the machine is in
operation. In order to use this feature, you must remove jumper “JP2” which is
located on the Main PC Board.
There are two methods to use this feature:
The first method is to apply a 0V signal (short to ground) when you want someone
to be able to change the mode, and remove the 0V signal when you don’t want
someone to change the mode. Apply this signal to the terminal labeled “LOCK” on
J5 located on the Main PC Board.
The second method is to apply a 115VAC signal when you want someone to be
able to change the mode, and remove the 115VAC signal when you don’t want
someone to change the mode. Apply this signal to the terminals labeled
“LOCKOUT” on J4 located on the Main PC Board.
4 OPERATING INSTRUCTIONS
4.1 Important Facts about Magnetic Holding
Workpiece characteristics must be considered in order to determine the magnetic holding
attraction that a magnetic chuck can provide.
This is true for all magnetic chucks because they all operate using the same fundamental
laws of physics. Magnetic power is often pictured as lines of magnetic force flowing from north
to south pole. Anything that limits the flow of these magnetic lines of force obviously reduces
the magnets holding capacity. There are many important factors that limit the flow of these
lines of force.