User Manual

Glossary 15-3
Offset Camera: Locates XYZ dispensing coordinates
offset from the dispensing needle.
Operator: A person running pre-programmed
dispensing systems and performing routine
maintenance.
Opto-Coupled: An electrical device that uses light to
send information.
Outputs: Electrical signals to control devices that
must turn On and Off on command.
Pattern: A command or set of commands that use
fiducials for dispensing lines, dots, etc.
Photodiode Array Pair: Optical sensors (Sender and
Receiver) that stop machine motion when the light
beam is interrupted.
PID: Proportional Integral and Derivative.
Pixels: The smallest unit of graphical data appearing
on a computer monitor. A pixel usually consists of
color and brightness information.
PLC: Programmable Logic Controller. Controls all
vacuum system elements (Auto Mode or Manual
Mode) and the conveyor (Auto Mode).
Pneumatic Devices: Air pressure actuated devices
such as: stop pins, clamp bars and lifter tables.
Port: Any machine connection that allows for the
exchange of electrical communication signals.
Positive Displacement Pump: The dispensing fluid is
forced into a pumping chamber or cylinder and then
forced out through the dispensing tip by a piston.
Post-Dispense Zone: The part of the dispensing area
where a part is held after it leaves the dispense zone
and before the part leaves the system. The part may be
heated in the post-dispense zone, but no dispensing is
performed.
Pot Life: The period of time that an epoxy is usable
once thawed.
Pre-Dispense Zone: The part of the dispensing area
where a part is held before entering the dispense zone.
The part may be heated in the pre-dispense zone, but
no dispensing is performed.
Process Engineer: A technical level position. The
Process Engineer designs and develops processes for
automated electronic packaging using production line
equipment.
Production Operator: A non-technical level position.
The production operator monitors and operates pre-
programmed dispensing systems during production
runs and performs minor routine maintenance.
Production Shutdown: When all dispensing has
stopped.
Psi: Pressure measured in pounds per square inch
(lbs/in
2
).
Pump Motor Ratio: The ratio of the number of teeth
on the motor gear to the number of teeth on the feed
screw gear.
Purge Station: A location on the dispensing system
where a suction is applied to the needle tip forcing the
fluid to flow. A plastic cup inside of the purge station
catches the fluid.
PWB: Printed Wiring Board.
Regulator: Device for controlling the amount of air
pressure supplied to the system.
RTD: Resistance Temperature Detector. A wire coil
or deposited film of pure metal, typically platinum.
The element’s resistance increases with temperature in
a known and repeatable manner.
Safety Interlock System: A key activated device used
to restrict access to the inside of the dispensing
system.
Safety Standard En60204: European Common
Market safety standards.
Safe-Z Height: The height that the dispensing head
can be raised to without impacting other fixtures or
parts on the PCB when moving.
scfm: Standard Cubic Feet per Minute.
Search Window: An area defined during the fiducial
location process. The search window is the area in
which the Vision System will look for a fiducial using
the Model Finder method of fiducial definition. The
default value is equal to the size of the computer
screen.
SECS/GEM: SEMI Equipment Communication
Standard (SECS)/SEMI Generic Equipment Model for
Effective Factory Automation (GEM). SECS/GEM is
the protocol used in cases where several factory
equipment units are linking together via a Host
Computer. The GEM standard defines useful
conventions for designing the communications
interface on a unit of factory equipment to improve
operations with a Host Computer.
SEMI: Semiconductor Equipment and Materials
International. An organization which defines
protocols for the semiconductor industry.
Serial Communication Ports: PC port designed to
facilitate serial communication between the PC and
another device.
Service Shutdown: When all dispensing is stopped to
perform machine service.
Service Stations: Purge and Weigh Stations on a
dispensing system.
Skew Correction: The ability of the software to adapt
to a part not oriented correctly on the workpiece.
SMEMA: Surface Mount Equipment Manufacturers
Association.
SSR: Solid State Relay.