PS288_OwnersMnl_PriorTo2009 - 第130页

System Theory • Pick And Place System 4—6 PS288 Owner’s Manual “Check doors/E-stop!” message appear s on the screen. When the door is closed and the message is cleared, motion resumes. Safety shield condition is monitore…

System Theory • User Interface System

PS288 Owner’s Manual 4—5

User Interface

System

Operator interaction with the PS288 is achieved with the following equip-

ment:

• Touch screen monitor

• Keyboard and touchpad

• Light tower

Through the use of these assemblies, the operator may communicate with

and control the PS288, as well as view system feedback and status indica-

tions.

Touch Screen Monitor

The touch screen monitor is a 30 cm (12 inch) LCD flat panel with inte-

grated touch screen. There are three cabled connections: DC electrical

power, a DB-15HD SVGA monitor connection, and a DB9 / RJ-45 connec-

tion for touch screen communications.

The 115 VAC supply is provided by the I/O Controller.

The RS-232 connection for the touch screen is plugged into the COM1 port

on the Handler Computer. The touch screen can be used in place of the

touchpad for operations or any other tasks that take place on the Handler

Computer. The touch screen does not work with the Laser Computer.

Keyboard and Touchpad

The PS288 uses an integrated keyboard and touchpad for space saving pur-

poses. The keyboard and touchpad are used as the central control mecha-

nisms for all systems on the PS288.

Light Tower

The light tower located on the top of the PS288 is used as a visual indicator

of the operating condition of the machine. It receives system status signals

from the I/O Controller:

Safety Systems

The PS288 employs safety systems to assist in the prevention of personal

injury, as well as potential damage to the equipment. Because of the speed

and force by which the PNP head moves, it is imperative that these safety

systems are operational and are never bypassed.

Emergency Stop and Safety Shield Interlocks

WARNING: Pressing an E-Stop button stops motion of the gantry

and PNP head only. It does not remove power from the PS288 or

the Option Bay (if installed).

Each of the safety shields found around the operating envelope of the PS288

has a safety interlock switch associated with it. When any safety shield is

opened during normal operation, gantry and SPNP head motion stops, and a

System Theory • Pick And Place System

4—6 PS288 Owner’s Manual

“Check doors/E-stop!” message appears on the screen. When the door is

closed and the message is cleared, motion resumes.

Safety shield condition is monitored by a human safety relay controller. The

safety shield interlock switches are connected in series and wired to the

human safety relay controller. Any open door breaks the circuit and provides

a signal representative of an open door to the human safety relay controller.

The human safety relay controller, in turn, relays the signal to the AH500

software and displays the “Check doors/E-stop!” message.

WARNING: Opening a safety shield stops the motion of the gan-

try and removes power from the gantry only. When the safety

shield is closed and the “Check doors/E-stop!” message cleared,

the gantry resumes its motion from the point where it stopped

moving.

Pick And Place

System

The PNP head consists of two motion subsystems: X- and Y-axes gantry sys-

tem, and Z- and R-axes motor system. A vacuum subsystem on the Socket

Actuator is used to pick devices from and place devices into their program-

ming sockets and input/output media. Together, these systems facilitate the

movement and proper placement of devices throughout the PS288.

Gantry System

The gantry system moves the PNP head on the X-axis and Y-axis. The sys-

tem is controlled by the AH500 software and moved with two servo motor

amplifiers. Each of the servo motor amplifiers is fed with 208–240 VAC via

the servo motor amplifier contactor controlled by the I/O Controller. Digital

encoders attached to the motors determine the PNP head’s position along the

lead screws and are accurate to within 0.0001 inches.

The servo motor amplifiers receive movement commands from the motion

controller interface card in the Handler Computer. Positional information

from the motor encoders is also interpreted on this card.

Home sensors for both axes provide reference locations for the gantry to

base movement distances upon, and are also monitored by the motion con-

troller interface card. Each of the optical sensors is powered by the 24 VDC

power supply described earlier in this chapter.

The motion controller interface card, in addition to the functions described

above, also provides commands and receives responses from the laser trans-

fer assembly (if installed) and the PNP head controls.

Pick And Place Head

The pick and place head facilitates movement on the Z-axis and R-axis

using an independent 24 VDC power supply to move the pick and place head

up and down, as well as apply rotational corrections. Its motion is controlled

by the motion controller interface card in the Handler Computer, and encod-

ers built into the pick and place head provide positional information to the

System Theory • Vision System

PS288 Owner’s Manual 4—7

motion controller interface card. When combined with the X–Y gantry sys-

tem, devices may be picked up and placed into any physical location within

the operating envelope.

The PNP head has an integrated probe tip through which a vacuum or posi-

tive pressure may be applied to attach or remove devices from the probe tip.

The probe tip is interchangeable to accommodate various sizes and package

types.

Socket Actuator

The Socket Actuator is a pneumatic driven solenoid used to actuate the sock-

ets before the PNP head places devices into or removes devices from them.

Sensors attached to the solenoid indicate the position of the Socket Actuator

and verify that it is safe to move devices to and from the socket.

The two sensors, one for the up position and one for the down position, are

adjustable for optimum sensing of the Socket Actuator’s position. When the

“up” sensor is active, the gantry system may retract the PNP head and move

to another area of the machine. When the “down” sensor is active, the PNP

head may extend to pick up a device from or place a device into a program-

ming socket. The Socket Actuator is not used when picking devices from or

placing devices into their input/output media.

Each sensor has an LED which turns red when the Socket Actuator is in the

up or down position.

Vision System

The vision system is used in conjunction with the PNP head to ensure accu-

rate alignment of the devices to be inserted into the sockets for program-

ming. Using data in a reference vision file for the device type to be

programmed, the PNP head can compensate for the misalignment of a device

in the X, Y, and R (up to 30 degrees) axes. Misalignments can be corrected

within 0.001 inches. The vision system cannot compensate for Z-axis errors.

The vision system consists of a camera, light ring, interface card, and soft-

ware. The light ring and camera are mounted onto a specialized bracket

below the work surface in a location dependent upon the configuration of the

machine. The interface card is installed in the Handler Computer, as is its

software interface.

The light ring is used to illuminate the device being analyzed by the camera

so that an accurate picture may be taken. The LED light source is powered

by 24VDC.

The camera is mounted to a bracket below the work surface and is optimally

focused onto a device attached to the PNP head when in the down position.

Focus and alignment data are set using the calibration routine described in

“Calibrating the Vision System” on page 5-41, and by the vision system soft-

ware.