Miller Electric KC237900 - Manual (Page 21)

OM-530 Page 17
The scale surrounding the BACKGROUND control is
calibrated in percentage and does not indicate an am-
perage or voltage value.
IMPORTANT: This control may be adjusted while
welding.
4-13. ELECTROSLOPE (Electroslope Models Only)
ELECTROSLOPE 9
The Electroslope in this unit allows the operator (by
means of the momentary-contact switch, RMLS-14) to
manually select the welding condition and the duration
of that condition. The welding conditions that the Elec-
troslope provides are PERCENTAGE INITIAL AMPER-
AGE, PERCENTAGE UPSLOPE RATE, PERCENT-
AGE DOWNSLOPE RATE, and PERCENTAGE FINAL
AMPERAGE. Additionally, adjustment of each condition
is provided by means of a control on the front panel of
the Electroslope.
IMPORTANT: A momentary-contact type switch
(RMLS-14) is supplied with each unit equipped with an
Electroslope, It is necessary to press the switch each
time a new or different weld condition is desired. This
switch allows the operator to manually control the selec-
tion of the welding condition and the duration of that con-
dition. It further gives the operator the capability of mov-
ing rapidly from one condition to the next, if desired.
Anytime that the arc is broken (except during the initial
condition), the Electroslope will automatically reset to
Off. During the initial condition resetting to Off is accom-
plished manually by pushing the switch once, provided
that an arc has not been established. (For further expla-
nation of this switch, see Section 4-5).
4-14. ELECTROSLOPE SWITCH (Electroslope
Models Only) (Figure 4-1)
ON
OFF
The Electroslope switch provides two positions: ON
and OFF.
When the Electroslope switch is in the OFF position, the
Electroslope will be bypassed or out of the welding pow-
er source control circuit. When the Electroslope switch
is in the ON position, the Electroslope will be connected
into the welding power source control circuit.
Ensure that the AMPERAGE switch on the TIG-Unit is in
the PANEL position whenever the Electroslope is to be
utilized. The AMPERAGE ADJUSTMENT control on
the TIG-Unit has complete control of the amperage at
this point.
4-15. PERCENTAGE INITIAL AMPERAGE CON-
TROL (Electroslope Models Only) (Figure 4-1)
A
PERCENTAGE
INITIAL
AMPERAGE
Adjust the PERCENTAGE INITIAL AMPERAGE control
for the approximate starting amperage desired. This
control is not linear and its settings represent a percent-
age of the AMPERAGE ADJUSTMENT control value in
use and not an actual amperage reading. Adjustment of
the PERCENTAGE INITIAL AMPERAGE control will
vary the amperage from minimum of the amperage
range used to the setting of the AMPERAGE ADJUST-
MENT control in the TIG-Unit. For example: If the
Range Switch setting has a amperage range of 100 to
500 amperes and the AMPERAGE ADJUSTMENT con-
trol on the TIG–Unit is set for 300 amperes, the setting of
the PERCENTAGE INITIAL AMPERAGE control on the
Electroslope will then determine the initial amperage be-
tween 100 and 300 amperes. If the PERCENTAGE INI-
TIAL AMPERAGE control is set at 50, initial amperage
will be approximately 200 amperes and will remain at
this amperage until the Upslope is energized. The initial
amperage can never be higher than the weld amperage
provided by the TIG-Unit.
IMPORTANT: This control may be adjusted while
welding.
4-16. PERCENTAGE UPSLOPE RATE CONTROL
(Electroslope Models Only) (Figure 4-1)
t
PERCENTAGE
UPSLOPE
RATE
0.25-20 SEC.
0.25-20s
The PERCENTAGE UPSLOPE RATE control is cali-
brated in percent and can be adjusted for an upslope
rate of approximately .25 (FAST) to 20 (SLOW) sec-
onds. With the control set at minimum, initial amperage
will rise immediately to the amperage setting of the TIG-
Unit AMPERAGE ADJUSTMENT control. When the
PERCENTAGE UPSLOPE RATE control is set at 50, it
takes approximately 10 seconds for initial amperage to
reach welding amperage provided that the difference
between initial amperage and weld amperage is great
enough. By increasing the control setting to 100, the
upslope rate will be approximately 20 seconds.
IMPORTANT: This control may be adjusted while
welding.