OperationInstruction_Vsision XP - 第127页

V ISION XP+ V AC Page 1 19 5 Software 5.5 The Masks Menu Operating Instructions V ersion 1.5 5.5.9 N 2 Operating Mode Fig. 5-4 8 N2 Operating Mode Note! Timer Mode: The timer function is deactiv ated when the nitrogen co…

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Page 118 VISION XP+ VAC
5 Software
5.5 The Masks Menu
Operating Instructions
Version 1.5
5.5.8 Fifo Interface (optional)
Fig. 5-47 Fifo Interface
With the Fifo option there is a PCB buffer behind the oven. The buffer is re-
sponsible that all boards are collected correctly in the oven also when sub-
sequent machines stopped.
In case of a failure the oven cannot be stopped as otherwise the boards burn
up. If no buffer is available and the subsequent machine doesn't take over
the boards, they move on top of each other in the cooling zone.
To ensure that the buffer can take up the boards at any time, the buffer locks
the oven inlet when the number of boards in the oven has achieved the num-
ber of free spots in the buffer. In order that it works two signals have to be
exchanged between the oven and the buffer, one in order that the buffer can
lock the oven and the second in order that the oven can inform the buffer
about the number of boards (an impulse per board). The signal for inlet lock-
ing is wire break-proof, with 24V the oven inlet is free, if there is no signal –
the oven inlet is locked. If the buffer is removed subsequently from the line
please ensure that 24V are on the interface as otherwise the oven inlet is
locked permanently.
VISION XP+ VAC Page 119
5 Software
5.5 The Masks Menu
Operating Instructions
Version 1.5
5.5.9 N2 Operating Mode
Fig. 5-48 N2 Operating Mode
Note!
Timer Mode:
The timer function is deactivated when the nitrogen control is working.
A) N2 Operation
On: Soldering is executed in a nitrogen atmosphere, servo-valves are
open. Off: Soldering is executed in air, servo-valves are closed in a time
delayed fashion. It is also possible to enter after how much delay time in
seconds nitrogen operation when switching off the heating is deactivated.
B) Flush Valve
After nitrogen operation has been activated, a scavenging valve is addi-
tionally opened for an adjustable period of time. Specified time can be ad-
justed here, and elapsed time can be monitored. Valve status is
displayed. The process chamber is opened, N2 operation is stopped im-
mediately. The purging phase is started over from the beginning after the
system has once again been completely closed.
C) Saving function (optional)
The economy mode option monitors the system’s loading status. An ad-
ditional control valve is opened after nitrogen operation has been activat-
CBA
F
Q
J
G
K
D
R
S
O
P
N
E
M
L
H
I
Page 120 VISION XP+ VAC
5 Software
5.5 The Masks Menu
Operating Instructions
Version 1.5
ed. It remains open until the system is once again empty for the first time
after the purging phase. Thereafter, it is always open when the system is
loaded. This function can be deactivated here. The valve is always open
in this case.
D) Set Value
Entry field for the residual oxygen setpoint.
E) Actual Value
Residual oxygen content display. If the residual oxygen meter does not
yet ready the display shows 999999.
F) Rel+
The relative upper tolerance limit can be selected here, relative to the
setpoint.
G) Rel-
The relative lower tolerance limit can be selected here, relative to the set-
point.
H) O2 tolerance violation
If the tolerance is exceeded or fallen short of, the “O2 tolerance” alarm is
triggered. No further work can be performed. In the flushing phase or af-
ter the program change until the set value is achieved for the first time,
no buzzer sounds with this alarm.
I) O2 tolerance warning (option)
This is a preliminary warning which precedes the “O2 tolerance” alarm. A
horn sounds if the tolerance is exceeded or fallen short of. Work can nev-
ertheless be continued.
J) Control mode
The control mode can be activated by entering different values for Y-min
and Y-max, and setting the Control mode button to ON.
Y-min = min. opening for N2 control valve
Y-max = max. opening for N2 control valve
Y = current setting is displayed.
K) Base Level
The valve's manipulated variable is set here for the basic level.
L) Oxygen meter on/off
The residual oxygen meter can be switched on and off here.