OperatorManual.pdf - 第32页
N2 conservation (optional) The N2 conservation mode allows you to set a timer to switch the main N2 supply off to the XPM oven after the oven is empty of processing boards beyond the set timer period . During the conserv…
Barcode reader (optional)
Use the barcode reader
The barcode reader allows you to either select your products via a handscanner manually or completely
automated via a fixed barcode system.
Principle of operation
1 - Hand scanner option
If you don't have the SMEMA option, you still can use a barcode reader, but as a user you have to determine the
status of the oven to decide if a new product can be chosen via the reader.
Basically instead of typing in the new product yourself, you use the reader to do that for you.
A typical sequence:
-empty the oven
-read the new barcode
-wait until the oven gets proccess ready
-enter the board with the barcode.
If you want to read in a barcode that uses the same product as the current one, you can just read the barcode and
enter the board.
2 - Automated barcode reading
If you have SMEMA (thus also the infeed/outfeed sensors), you can use a fixed barcode reader on the infeed of
the oven. The oven will automatically control the correct board flow, using the infeed/outfeed sensors and the
SMEMA capabilities.
A typical sequence:
-A barcode gets read on a board
- The oven determines that the new product differs from the current one and will stop the infeed via SMEMA
- After the last board exits the oven, the new product gets loaded, machine will go into stabilize mode.
- After the oven goes into proccess ready, the infeed will allow boards again, via SMEMA.
- The board enters the oven
- The barcode on the next board gets read
- The product is the same as the current one, the oven lets the board enter
IMPORTANT
The automated barcode o
p
tion re
q
uires the use of the SMEMA o
p
tion.
If the barcode system is active, the program uses the 'barcode' product/recipe directory. Products/recipes
that are being used by the barcode system have to be stored there.
IMPORTANT
In the automatic mode, the system assumes that every board has a correct barcode, and that that barcode is
linked to a valid product. There is no hardware forseen to detect boards with an invalid or without a barcode.
Those boards will enter the oven with the current settings.
Operator manual 31 August 2003
N2 conservation (optional)
The N2 conservation mode allows you to set a timer to switch the main N2 supply off to the XPM oven after the
oven is empty of processing boards beyond the set timer period. During the conservation mode, the 'stand-by' N2
valve will be active. The user can set a regulator to control the 'stand-by' amount of N2.The main purpose of this
mode is to optimize N2 usage during extended idle periods.
The conservation mode has the following setings:
z Time out[min] - the time that the machine has to be empty before the conservation mode kicks in. If 0,
inactive.
z
Fans[rpm] - the fan speed in conservation mode. If 0, recipe fan speed
z Purge[min] - the N2 purge time when returning to normal mode
The settings mentioned above are located in the configuration under the atmophere tab.
Principle of operation
S1 :
upstream sensor
positioned outside the XPM oven. To optimize against restricting board travel in the
production line, sensor S1 should be placed far enough prior to the onload of the oven. This is to allow the XPM
oven sufficient time to switch from N2 conservation mode and to re-establish the O2 ppm level prior to a board
arriving at the oven, without stopping a board prior to the oven. The wait time of the boards in front of the oven
should be minimized to prevent blocking the line for an extended period.
S2 :
board entering sensor
positioned at the entrance of the XPM oven.
S3 :
board exiting sensor
positioned at the exit of the XPM oven.
If the XPM oven starts up with a N2 recipe, the main N2 valve and the purge valve are activated. The length of
purge time in minutes is controlled by the purge time setting in the recipe. As soon as the purge is finished and all
the parameters are stable, the oven will go into a
ready
status. At this point boards are allowed to enter the oven.
If the oven is empty and there are no boards between sensor S1 and the oven, the N2 conservation time-out timer
will start. When the time-out expires, the oven switches to N2 conservation mode. This means:
z The main N2 supply is shut off
z
The 'stand-by' N2 supply is activated
z A N2 conservation indication will appear on the PC screen
z
The yellow lamp on the light tower will light
z SMEMA will not allow boards to enter the XPM oven
Operator manual 32 August 2003
As soon as a board passes S1, the following will happen:
z Stand-by N2 will be shut off
z Main N2 will be activated
z N2 re-purge will be activated
z
The oven will go to a
stabalize
status
SMEMA will not allow boards to enter the oven until the oven is
Ready
The event that a board is between sensor S1 and the XPM oven is latched. This appears on the screen as '
N2
conservation inhibited
' . This latch is cleared after the oven is completely empty. This means that the N2
conservation time-out should be set longer then the time that it takes for a board to travel from sensor S1 to
sensor S2 in the oven.
Operator manual 33 August 2003