Thermal Arc ULTRA FLEX 350, Руководство пользователя

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8 — Voltage Select Switch: This switch is used
to select the line voltage that the machine is con-
nected to.
Protection Features
The Ultra Flex
®
has the following built-in protection
features designed to assure reliability. If the ma-
chine is shutdown because of one of the protection
circuits, the digital meter will display a fault code.
See the Troubleshooting chapter for an explanation
of the fault codes.
a. Output Short-Circuit Protection — The out-
put terminals of this machine can be short-circuited
for all modes of operation including Constant Volt-
age without damage to the machine. The protection
circuit instantly limits the output current to a safe
maximum value during short-circuit conditions.
b. Overcurrent Shutdown — If the average
welding amperage exceeds the overcurrent values
shown in Table 3-3, the machine will shut itself off
in less than four seconds. The purpose of the over-
current shutdown is to protect the machine from
overheating if the maximum rated output amperage
is exceeded. The RED fault light will come on and
the digital meter will display a fault code indicating
that an overload has occurred. All function buttons
will also be disabled. To reset this condition it will be
necessary to momentarily shut the main power
switch off.
c. Overtemperature Shutdown — The machine
contains a thermostat to sense an overtemperature
condition. Overtemperature could occur because of
exceeding the duty cycle of the machine, high am-
bient temperatures, blocked air flow, fan failure, etc.
If an overtemperature condition is sensed, the RED
fault light will come on and the digital meter will
display a fault code indicating that an overtempera-
ture has occurred. All function buttons will also be
disabled. To reset this condition it will be necessary
to momentarily shut the main power switch off.
d. Single/Three Phase Detector — The pur-
pose of this circuit is to sense whether the power
source is connected to single or three phase power
and set the maximum output scaling accordingly. If
the machine initially is powered up on three phase
and later detects single phase, the machine will shut
off and turn on the RED fault light. The digital meter
will also display a fault code and the user interface
will be disabled. This condition would most likely
occur because of a blown line fuse on one of the
three phases. To reset this condition it will be nec-
essary to momentarily shut the main power switch
off.
e. Input Voltage Detection — If the input voltage
is too high or too low (see machine specifications
for rated line voltages) the machine will not operate.
This condition will also be indicated by the RED fault
light and fault code on the digital meter. To reset this
condition it will be necessary to momentarily shut
the main power switch off.
f. Ground Fault Protection — The ground fault
protection will disable the output of the machine if it
senses welding current flowing through the safety
ground wire in the 19 pin remote receptacle. This
condition will also be indicated by the RED fault light
and fault code on the digital meter. To reset this
condition it will be necessary to momentarily shut
the main power switch off.
Description of Control Panels
(See Figure 3-4)
GENERAL: The control panel consists of a mem-
brane switch and digital display. The control panel
will give both audible and visual feedback when a
button has been pressed. The UP and DOWN
buttons are used to adjust all of the preset values.
If the UP or DOWN button is held down for more
than two seconds the digital display will start to
scroll the preset value faster, allowing for more rapid
changes. Pressing any of the other preset buttons
will activate that function, unless the function is not
allowed for the weld process selected. For example,
the arc force function is only active during the
SMAW (Stick) process. When a button is active, the
LED adjacent to the button will be lit.
1 — AMPS LED INDICATOR: This indicator will
be lit whenever the digital meter is displaying either
preset or actual weld AMPS.
2 — VOLTS LED INDICATOR: This indicator will
be lit whenever the digital meter is displaying either
preset or actual weld VOLTS.
Figure 3-4 Control Panels
430429-465
DESCRIPTION OF EQUIPMENT
February 28, 2000 3-5