Weller WMD 3 Manual De Uso página 27

simultaneously. Switching a channel off does not cause the
stored data to be lost.
Temperature / air setting
In order to make it possible to set the desired temperature or
air flow-rate, the corresponding channel has to be selected
with the `1-2-3' key. Activation of the `UP' or `DOWN' key will
alter the temperature or the air function in the appropriate
direction for channels 1, 2 or 3.
If the key is held down continuously, the value selection will
change rapidly.
Variance display
The standard value displayed is the actual value of the selec-
ted channel, when the symbol `C' is continuously visible for
channels 1, 2 and 3, and for the air flow-rate setting the `AIR'
symbol is continuously visible. A brief touch of the `UP' or
`DOWN' key will produce a display of the set value for
approx. 4 seconds, whereupon the corresponding symbol `C'
or `AIR' will flash on the display. After approx. 4 seconds, the
display will automatically switch to the actual value. The
system is designed such that only the set value is indicated
where a hot gas bit is operated.
Timer
The WMD-3 control unit is also equipped with a timer func-
tion. This timer enables previously set temperatures of indi-
vidual channels to be set back to 150˚C. The set-back peri-
od can be set in 5-minute stages and will start after the last
operation. The set-back period can be set to a maximum of
60 minutes. It is possible to adjust different set-back period
for individual channels. On operation of the hot-air pencil,
the timer fulfils the function of time-limiting the airflow, and
can be set in 1-second stages up to a maximum of 60
seconds (same for all channels).
Setting of the timer
The timer function is not activated in the standard setting.
Before setting the timer, the desired channel must be selec-
ted by means of the `1-2-3' key. Next, the `TIMER' key is
activated and the clock symbol and the `000' sign will appe-
ar in the display. In order to activate the timer function, the
`UP' and `DOWN' keys must be pressed simultaneously wit-
hin approx. 4 seconds. As long as the key-operated switch
(12) is not in the locked position, the desired setback time
can be set with the "UP" or "DOWN" key. If the key is conti-
nuously pressed down, then the set value will change rapid-
ly. If a hot-gas pencil is used, then the set value can be
changed in 1-second stages by pressing the required direc-
tion key, or in 5-second stages for other tools. Approx. 4
seconds after the last input, the display will automatically
switch to the actual value for the set channel.
Timer function reset
Every channel has a timer. The timers can be set and reset
independently. Select the desired channel with the "1-2-3"
key and confirm with the keys "UP", "DOWN" or "TIMER".
The programmed setpoint will be displayed for a short time,
and the display will then return to the actual value.
Timer function switch-off
The desired channel is selected by means of the `1-2-3' key,
then the `TIMER' key is pressed. Set the value to "000" with
the "DOWN" key. The timer function is now deactivated.
Key switch
If the key-operated switch is in the locked position, all input
functions are blocked. Therefore, only inquiries are possible
in this position.
Reset function
This function is used to return the control unit to the basic
setting. It is necessary to switch off the unit, wait approx. 10
seconds, then hold down the keys "TIMER" and "1-2-3"
while switching on the unit until the self-test is concluded
and "FSE" (Factory Setting) appears on the display.
All temperature settings should now be at 350˚C, the timer
function should be switched off and the air supply set to
50%.
Temperature offset
The temperature control of the WMD 3 is harmonised to the
average value of the available range of solder tips. Tolerance
is ±9°C for soldering and de-soldering bits. For hot-air tools,
tolerance is ±30˚C. Individual channels can be re-calibrated
for special applications.
For this purpose, the temperature offset (difference between
the measuring instrument display and the control unit
display) is ascertained by means of the corresponding mea-
surement peaks and an external temperature measuring
instrument. The adjustment function can be activated by
simultaneously pressing the `TIMER' and `1-2-3' keys, which
is indicated by flashing of the `C' symbol. The temperature
offset can be corrected within the range ± 40˚C by simulta-
neously pressing the `UP' or `DOWN' key. If no modifications
are made, the display will automatically change to the actu-
al value after the keys are released.
Warning: For the purpose of cooling the unit, the pump
motor is equipped with a fan. Adequate air circulation
should therefore be ensured.
Maintenance
For operation with the hot gas pencil:
The air flow-rate of the pump is affected by dirty filters.
Consequently the main filters for `VACUUM' and `AIR' should
be regularly inspected and replaced as required. For this
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