2500_Users_Manual.pdf - 第162页

Preven tive Maint enance 5-8 ProMa ster 25 00 U ser Ma nual The beam ha s a traverse motor (wit h an encoder) th at moves the beam along the lea d screw in its horizon tal (left-to-right ) travel. The encoder counts the …

Preventive Maintenance

ProMaster 2500 User Manual 5-7

Optics

Optics detect and monitor the location of devices, the movement and

position of the beam, labeler movement, orbital motor positions, label

position on the liner (the translucent label backing material), and position

of the ribbon and ribbon pinch roller in the thermal printer (25 and 26 in

Figure 5-1). The optics are mounted in pairs at various places on the

handler. Each pair of optics is made up of an infrared light-emitting

device (emitter) in line with a light-sensitive collector.

All emitters are of two standard types and can be exchanged with like

emitters from any location during troubleshooting. Emitters are

identified by red-and-black or blue-and-black wires crimped to a slide-on

connector. Collectors are identified by blue-and-yellow or red-and-

yellow wires.

Track Optics

The track optics monitor the presence and movement of devices in the

tracks.

Positioning Optics

The reference position optic (17 in Figure 5-1) detects when the beam is at

the far right position and sets the encoder to “0,” which establishes the

starting position of the beam.

Optics 3 and 4 detect the vertical position of the beam.

ADC Label Calibration

Optic

The ADC optic on the dot matrix and thermal label printers senses the

position of labels on the liner so they are positioned properly for the print

head and applied correctly to the device. This optic pair detects the

presence of a label by using the liner as a reference. During label

calibration, light from the emitter passing through the liner is sensed by

the optic collector. As a label on the liner travels between the optic pair,

the decreased light level is detected. When the amount of light increases

again, the ADC optic interprets that change as the end of the label.

Label Sensing Optic

The label-sensing optic on the dot matrix label printer monitors the label

liner and detects when the 2500 runs out of labels.

Switches

A mercury switch on the top cover senses when the hood is open and

causes the 2500 to display a warning message. The 2500 will operate with

the hood up only when you are running the motor diagnostic tests.

A mercury switch on the main plate senses when it is in the raised

position.

A microswitch on the input tube clamp detects the presence of an input

tube (19 in Figure 5-1), and each of the output tube clamps have a

microswitch that detects the presence of an output tube (20 and 21 in

Figure 5-1).

Switches on the front and back side of the programming module engage

when it is properly installed. If the switches do not engage, an error will

be displayed.

Motors

Stepper motors are used on the 2500 to control the movement and

labeling of devices.

Preventive Maintenance

5-8 ProMaster 2500 User Manual

The beam has a traverse motor (with an encoder) that moves the beam

along the lead screw in its horizontal (left-to-right) travel. The encoder

counts the number of steps the beam travels from the home position and

sends that information to the main board. The beam assembly also has a

beam rotate motor that controls the rotation of the device on the chuck.

The 2500 has three additional stepper motors. The label drive motor

(used in the dot matrix printer and in the thermal printer) advances labels

at a precise rate past the print head to create even spacing between

characters. This motor also advances the liner so the label contacts the

device according to the position defined by the label placement value

specified in the Task.

The input orbital motor rotates, causing the input orbital assembly to

shake. This shaking helps the devices slide from the input tube to the

input track. The output orbital motor performs a similar function when

devices are sliding from the output track to the output tubes.

Solenoids

The handler uses air solenoids that are activated by signals from

MOSFET circuitry on the controller board. When the correct logic drive

signal for a specific solenoid is active, an LED associated with that circuit

is lit.

Beam and Chucks

The microprocessor-controlled beam, using a pick-and-place head and an

interchangeable vacuum chuck, picks up and places devices at the

programming or labeling station and releases devices into the output

track.

The beam traverse stepper motor drives the beam on the horizontal (left-

to-right) axis along the lead screw. You must keep this lead screw clean

and lightly lubricated to ensure correct beam operation. If you do not

keep the lead screw clean, the beam may eventually develop alignment

problems and fail to locate the center of a device.

Beam stalling is a term used to describe the failure of the beam to travel

freely on the lead screw, resulting in lost steps and the inability to travel

the full distance of the lead screw. The chance of this occurring is very

low, because the beam traverse motor has an encoder that keeps track of

the beam’s movement.

A device rotate motor, which is mounted on the beam assembly, is

connected to the beam head by a timing belt. The device rotate motor

controls the rotation of devices on the chuck so that the device orientation

can be adjusted for programming or labeling.

Preventive Maintenance

ProMaster 2500 User Manual 5-9

System Air Flow

Air enters the 2500 through a 1/4-inch air connector on the rear and

branches through a Y connection to the low and high air pressure

regulators (see Figure 5-2). The air exits each regulator in two ways: to

the gauge (to display the PSI) and through the 2500 as described below.

Low air pressure should be set to 30 PSI, and high air pressure should be

set to 85 PSI. Solenoids switch high or low air pressure to the beam to

perform various functions, as shown in the table and as described in the

following sections.

Low Air Pressure

Low pressure air is routed from the low pressure regulator to a solenoid

block where it is switched to either the beam or the output track (see

Figure 5-2).

Beam Up/down

This section describes how the air pressure is routed through channels

inside the beam. Refer to Figure 5-16 for the location of the beam

solenoids and Figure 5-3 for the location of air channels as you read this

section.

After the 2500 powers up, solenoid

(beam up/down) forces low

pressure air through an air channel in the beam baffle plate from hole 11

to hole 10, up through the beam to hole 16 and hole 17, and finally to the

top of the fixed piston, pushing the beam assembly up into the ready

position. Low pressure air passes through the beam and a single air cap

(cavity), which dampens out air spikes and is routed directly to solenoids

and

High Pressure Low Pressure

Beam vacuum generators Lower beam to pick up device

Lower beam to release device

Final insertion force into

programming module

Initial insertion force into programming

module

Programming module

clamps

Device blow off

Output tube air to start device movement