2500_Users_Manual - 第163页
Preventi ve Mai nten ance ProM aster 25 00 User Manua l 5-9 System Air Flow Air enters the 2500 th rough a 1/4-inch air connector on the rea r and branches through a Y connection to the low an d high air pressure regulat…
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
4
(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
4
and
5
.
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
Preventive Maintenance
5-10 ProMaster 2500 User Manual
When the beam lowers, it is driven down by low pressure air routed
through hole 12. This air enters the hi/low valve assembly through hole
19 and pushes the ball bearing up, sealing off hole 21 and creating a path
to hole 20. From hole 20, the low pressure air is forced to hole 18, pushing
down on the fixed piston and lowering the beam. This air is vented
through exhaust holes on the bottom of the beam assembly.
Figure 5-2
High and Low Pressure Air Lines
2054-2
MAIN PLATE (Underside)
BACK OF BASE
BOTTOM OF BASE
FRONT OF BASE
BLACK (HP)
GRAY (LP)
BLUE
RED
EXTERNAL INPUT
REGULATORS
GAUGES
REGULATORS
AIR CYLINDER (1 of 2)
BLOW REGULATOR
SOLENOID 8
TO BEAM
SOLENOIDS
2 AND 3
TO OUTPUT TUBE
PART BLOW IN
HIGH
LOW