Technical_reference - 第114页
Technical Service Manual 114 Revision Dat e: August 2004 POLAR COOL ™ OPTION Polar Cool™ is : ! Standard (on Nitrogen ovens ) ) An option (on all ovens) DESCRIPTION: The Polar Cooling™ s ystem is s elf-c ontained and mou…
Technical Service Manual 113 Revision Date: August 2004
Display Mode Description Setting
A 8
Configuration A:
set range
Display range setting 8 =Auto Range (default)
1 0
Configuration 1:
Alarm 1 Trip
Alarm 1
descending/ascending
0 =ascending alarm1 (default)
2 0
Configuration 2:
Alarm 2 Trip
Alarm 2
descending/ascending
0 =ascending alarm1 (default)
3 1
Configuration 3:
Analog output
Analog voltage output 1=0-10vdc (default)
4 0
Configuration 4:
Set Serial
Output
Serial output format
0=none (default), Must change
to 3=machine with checksum
7 9
Configuration 7:
Set Zero Range
Set zero calibration range 9=18%-24% (default)
F 0
Configuration F:
Set Fail Safe
Alarms 1 & 2 fail safe
0=not failsafe, relays are
energized in an alarm condition
(default)
b 5 Configuration b:
Serial baud rate
RS-232 port baud rate 5=9600 (default)
C 0
Configuration C:
Initiate clean
mode
0=normal sensor operation
(default)
E 0
Configuration E:
Set voltage to
110 or 220 VAC
Remote Sensor Module
supply voltage
0=110 VAC (default) do not
change without changing the
switch setting on the remote
sensor module, otherwise the
remote sensor module will be
permanently damaged
8 0
Configuration 8:
Reset to factory
defaults
Restore factory defaults 0=normal operation (default), 888
restores factory defaults
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3152502 ASSEMBLY O2 ANALYZER INTERFACE BOARD THEORY OF OPERATION
The Atmel Atmega161 micro-controller is the main component on the board. The Atmega161 has two built in UARTS.
The first UART is used to communicate to an RS485 connection on a multi-drop network through MODBUS protocol. The
second UART is used to communicate directly to an O2 analyzer through an RS232 connection.
The RS485 port is not used with the existing controller since the existing controller does not have additional serial ports
available. Instead, two frequency generator outputs from the micro-controller are used to communicate O2 analyzer data
to the existing controller by using two counter inputs on the existing controller. Using the timer/counter compare outputs of
timer 1 and timer 2 of the Atmega161 micro-controller derives the two frequency generator outputs. Timer 1 has 16-bit
resolution and is used to send measured value information, while timer 2 has 8-bit resolution and is used to send range
and alarm information. The Neutronics model 3100 analyzer has six ranges and automatically changes ranges to
measure from 0ppm to 100% concentration.
Dipswitch 4 on S1 is used to enable the use of the two frequency generator outputs through software when the switch is
set to the ON position.
Oxygen analyzer related parameters in the recipe editor are not displayed when the atmosphere setting is for air on a
switching atmosphere oven or on an air only oven. A graphic LED indicator is displayed in the oxygen analyzer field to
indicate that the “ready to measure signal” is present from the oxygen analyzer. The oxygen analyzer reading is included
in trending and data logging.
Technical Service Manual 114 Revision Date: August 2004
POLAR COOL™ OPTION
Polar Cool™ is:
! Standard (on Nitrogen ovens) ) An option (on all ovens)
DESCRIPTION:
The Polar Cooling™ system is self-contained and mounted to and integrated with the oven. This system does not
require any external service connections to the Reflow Oven.
OPERATION:
The Polar Cool System uses an air-to-liquid-to-air heat collection and discharge system. A cooling fluid (Vitronics SUPER
COOL Part No. 3313350) is pumped through heat exchangers in the cooling cells. Heat is absorbed into the fluid, and
then carried by the cooling fluid to a radiator-fan unit. The heat removed from the cooling cells in the tunnel is then
discharged into room.
Two reusable, easy to remove heat exchangers are mounted in each of the 2, 3 or 4 cooling cells. (The number of
cooling cells depends on the Oven Model)
Technical Service Manual 115 Revision Date: August 2004
The following diagram shows the Polar Cooling™ option configured for an oven with three cooling zones. (Two or four
cooling zones would be similar)
PolarCool ™ and Control Cooling Plumbing Schematic
The cooling fluid is Vitronics SUPER COOL cooling fluid, Part No. 3313350. During normal operation, the cooling
fluid will be warmer than the “dew point temperature” of the room and not warmer than the frame of the oven.
Two thermocouples sense the coolant temperature, which is displayed on the Oven Control Software screen.
DO NOT SUBSTITUTE ANY OTHER FLUID AS COOLANT IN THIS SYSTEM!