1147100
SmartPAC PRO Servo User Manual
122
Chapter 5
– Program Mode
Impedance
Impedance is a measure of the resistance to the flow of electric current. Some die protection controls
have inputs for electromechanical sensors that provide different impedances. As a rule of thumb, use
a high-impedance input if the part is dirty or covered with a non-conductive lubricant. Use a low-
impedance input if the part is covered with a water-based or conductive lubricant.
DiProPAC boards shipped since August 2007 are compatible with all impedance levels. However,
DiPro Sensor Interface (DSI) 2 cannot be used with low-impedance sensors. If you have a low-
impedance application (e.g., a wire probe application in which a part/strip covered with a water-
based, conductive lubricant completes the circuit), the sensor must be wired directly to the DiProPAC
board.
Sensor Types
Sensors used with die protection systems are classified as red, yellow, or green. For SmartPAC PRO
Servo with DiProPAC, there are four types of green sensors–green, green quick check, green
constant, and green special–all of which require an event to occur on every stroke or at least once
during a set number of strokes.
When you make settings for a tool, you select the sensor type for each sensor connected to SmartPAC
PRO Servo. You can program any combination of reds, yellows, or greens. Instructions for
programming sensor types is provided starting on page 125.
Yellow Sensors
Yellow sensors, which are normally open to ground, are ideally suited to monitor events like stock
buckling, end of stock, or die overload. When a yellow sensor closes, SmartPAC PRO Servo sends a
Stop command to the press. Because yellow sensors work independently of the ram angle and do not
actuate on every stroke, you do not set a Ready signal for them.
Red Sensors
Red sensors, which are normally closed to ground, are used to monitor the same events as yellow
sensors: die overloads, end of stock, and buckling. A Stop command is sent to the press when the red
sensor opens. No Ready signal is set for red sensors.
Green Sensors
Green sensors, which are normally open, are used to monitor events that must occur during a certain
portion of each stroke or intermittently every designated number of strokes. Examples are part
ejection, stock feed, and part transfer. SmartPAC PRO Servo stops the press when the green sensor
closes to ground.
Any sensor set to green, green quick check, or green constant must actuate during the Ready signal.
Depending on the type of green sensor, the Ready signal is set either a little longer or a little shorter
than the actuation time.
The four types of green sensors are described below.
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