Technical_reference - 第123页
Technical Service Manual 123 Revision Dat e: August 2004 After the ‘r ail out’ function has been tested, the ‘rail in’ f unc tion c heck out should be greatly reduced. Activate the ‘rail in’ function in the O ven Operati…
Technical Service Manual 122 Revision Date: August 2004
AUTO RAIL ADJUST
Auto Rail Adjust is:
! Standard, (installed on all ovens) ) An option, (NOT installed on all ovens)
DESCRIPTION
The Oven Control Program automatically adjusts the rail in/out to meet the board size entered in the PRODUCT file in the
Oven Control Program.
OPERATION
Run the Automatic rail adjust within the Oven Operation Program. NOTE: This operation may require a password.
(The direction of travel of the rail and the speed of the width adjust may be selected by choices in the Oven Operation
Program.)
1. Set the rail adjust speed to MAX and select either IN or OUT to move the rail.
2. With the rail width adjustment enabled, select MIN for minimum width speed adjustment. The rail movement should
decrease to a very slow rotation, or stop.
3. Using a Voltmeter on the armature of the Rail Adjust Drive Motor output points, adjust the output voltage to 15 VDC.
The IR COMP potentiometer on the auto rail DC drive should be set to the midpoint position. The TORQUE
potentiometer on the auto rail DC drive should be set to 90%.
4. Run the rail width calibration routine in the Oven Control Program.
While conducting the following tests ensure that the rail does not move to its minimum or maximum value and stop. The
rail adjust system is designed to stop at these positions.
5. Verify that the DC drive card is receiving 120 VAC power between terminals L1 and L2. If not, verify that K37 & K38
are energized.
6. Check that the I/O board relay A1-K9 is energized.
7. Measure and verify that the voltage at wire number 1039 at PX9-20 on the I/O board is +10 VDC.
8. If voltage is present, check the wiring at the signal input of the DC Drive.
9. If the preceding steps check out, measure the DC voltage output of the DC drive circuit board between terminals A1
and A2. Voltage present should be 90-130 VDC. If there is no voltage present, the drive circuit board is likely to be
defective. Otherwise, adjust the SIGNAL ADJUST potentiometer on the DC drive board to produce the 90-130 VDC.
If steps 1-9 have been performed and the rail motor still does not operate, refer to the Oven Schematics and proceed with
the following:
1. Verify that “rail out” control relays K8, A1-K9, A1-K19 & A1-K22 are energized.
2. If A1-K9 is not energized, confirm that A1-K19 & A1-K22 are energized.
3. If A1-K19 & A1-K22 are energized, check the associated wiring.
4. If the rail motor still does not turn, press an e-stop switch to disable 120 VAC control power.
5. Check connections to the K8 relay.
6. Using an Ohm meter, verify that there is continuity through each rail limit switch
(If either the switch is wired incorrectly or the rail is pressed up against the limit switch, there should be no continuity
through the switch.)
7. Pull out the E-stop recently pressed and reset the E-Stop in the Oven Control Program.
Technical Service Manual 123 Revision Date: August 2004
After the ‘rail out’ function has been tested, the ‘rail in’ function check out should be greatly reduced. Activate the ‘rail in’
function in the Oven Operation Program (this is assuming you have already logged into the software as previously
described). The parts of the auto rail circuit which can be a problem, is the ‘direction relay’ K8 and the ‘rail in’ limit switch.
The test procedure for these components would be the same as described for the ‘rail out’ circuit.
The final check out procedure is to verify that the linear transducer feedback signal is being received and processed by
the computer.
(If the linear transducer is operating and connected properly, the loop feedback value should be 2 – 10 VDC)
Run the “Manual rail adjust” within the Oven Operation Program. NOTE: This operation may require a password.
When the rail is moving inward, the value should decrease. If the transducer loop feedback value is not within the
prescribed range, check the wiring from the transducer to the controller. The transducer signal output is 0 to +10 VDC.
The signal level from the transducer is then reduced to a 60 mV level by a voltage divider circuit. A possible error with
this circuit is incorrect resistor values used on the voltage divider circuit. Verify the polarity of the transducer signal output
to be correct.
Technical Service Manual 124 Revision Date: August 2004
SMEMA INTERFACE
The SMEMA Interface is:
! Standard, (installed on all ovens) ) An option, (NOT installed on all ovens)
DESCRIPTION
(SMEMA is the acronym for Surface Mount Equipment Manufacturer’s Association)
The SMEMA electrical interface option for the Reflow Oven is intended to comply with the SMEMA Electrical Interface
Standard 1.2. It provides signals from the Reflow Oven to the upline/downline equipment in the process line.
A PLC is mounted inside the electrical enclosure; a photo-sensor is mounted on brackets above each end of the
conveyor(s). A 14 pin round connector is mounted on each end of the Reflow Oven. The SMEMA interface receives
power from the Reflow Oven to operate. (The PLC operates two SMEMA circuits.) The SMEMA interface accepts a
'Board Available' signal from the upline (onload side) of the Reflow Oven on pins 3&4 of the onload connector. It replies
with a 'Busy' signal on pins 1&2 of the onload connector to the machine upline. On the downline (offload) side, a 'Board
Available' signal is sent on pins 3&4 and looks for a 'Busy' signal to come back on pins 1&2 of the offload connector.
Because the Reflow Oven should not be stopped with product in the heat zone, the busy signal coming from the downline
end is used to generate the busy signal for the upline equipment without stopping the Reflow Oven. When all of the
conditions are ‘False’, the Reflow Oven is “not busy” and will accept more product from the upline equipment. If any of
the conditions are ‘True’, the Reflow Oven will transmit a "busy" signal to the upline equipment. This should stop the
upline equipment from sending product to the Reflow Oven, thus preventing a product buildup.
The upline “busy” signal can be a result of one (or more) of the following:
1. Board at ‘on-load’
2. Board Jam at off-load
3. Downline machine has not sent ‘ready’ signal for 2 boards
4. Oven is NOT ‘Process Ready’
5. The (settable) spacing between boards has not been satisfied.
The busy signal from the Reflow Oven to the upline piece of equipment is designed to provide a space equal to
approximately 1/2 the product length between each product under normal operation. The board available signal sent from
the upline equipment is not implemented because the oven should not be stopped and started. The board available signal
sent from the Reflow Oven to downline equipment is a notification of product coming out of the oven.
When a board's leading edge passes under the onload sensor it triggers the busy signal to be true (on) for 1.5 board
lengths. This tells the upline equipment feeding the Reflow Oven to wait for 1.5 board lengths before feeding another
piece to the Reflow Oven. When the board exits the oven and the leading edge passes under the offload sensor, it
triggers the board available signal to go true (on) 1 second later and to stay true for one board length. This signals the
downline equipment receiving product from the Reflow Oven to expect a board at that time. The 1-second delay is to
ignore false signals created when the photocell senses the conveyor belt.
The PLC controls the delays and triggers the operation of the interface off of the process ready signal. If the machine is
NOT process ready, the SMEMA interface will signal busy to the upline equipment.