Welding Controls - Lincoln Electric RANGER 305 D Service Manual

RANGER 305D
8. IDLER SWITCH: Has two positions as follows:
1) In the HIGH position, the engine runs at the high idle
speed controlled by the engine governor.
2) In the AUTO position, the idler operates as follows:
• When switched from HIGH to AUTO or after starting
the engine, the engine will operate at full speed for
approximately 12 seconds and then go to low idle speed.
• When the electrode touches the work or power is
drawn for lights or tools (approximately 100 Watts
minimum), the engine accelerates and operates at full
speed.
• When welding ceases or the AC power load is
turned off, a fixed time delay of approximately 12
seconds starts. If the welding or AC power load is not
restarted before the end of the time delay, the idler
reduces the engine speed to low idle speed.
• The engine will automatically return to high idle speed when
there is welding load or AC power load reapplied.

WELDING CONTROLS

9. Output Control: The output control dial is used to present the
output voltage or current as displayed on the digital meters for
each of the four welding modes. It can also be used to vary the
output while welding. This control is disabled by an auto-sensing
circuit if the machine is in CC-Stick, Downhill pipe, or CV-wire
modes, and an accessory device with output control capability is
plugged into either amphenol.
When in Touch-Start TIG mode, and when an accessory device
with output control, such as an Amptrol, is plugged in to either
Amphenol, the OUTPUT control dial is used to set the maximum
current range of the accessory output control device.
10. WELD MODE SELECTOR SWITCH: This switch provides four
selectable welding modes:
- CV-WIRE
- DOWNHILL PIPE
- CC-STICK
- TOUCH STARTING
11. ARC CONTROL- The ARC CONTROL dial is active in the CV-WIRE,
CC-STICK, and DOWNHILL PIPE modes, and has different
functions in these modes. This control is not active in the TOUCH
START TIG mode.
CC-STICK mode: In this mode, the ARC CONTROL dial sets the
short circuit current (arc-force) during stick welding to adjust for
a soft or crisp arc. Increasing the dial from –10 (soft) to +10
(crisp) increases the short circuit current and prevents sticking of
the electrode to the plate while welding. This can also increase
spatter. It is recommended that the ARC CONTROL be set to the
minimum number without electrode sticking. Start with a setting
at 0.
DOWNHILL PIPE mode: In this mode, the ARC CONTROL dial sets
the short circuit current (arc-force) during stick welding to adjust
for a soft or a more forceful digging arc (crisp). Increasing the
number from –10 (soft) to +10 (crisp) increases the short circuit
current which results in a more forceful digging arc. Typically a
forceful digging arc is preferred for root and hot passes. A softer
arc is preferred for fill and cap passes where weld puddle control
and deposition ("stacking" of iron) are key to fast travel speeds. It
is recommended that the ARC CONTROL be set initially at 0.
CV-WIRE mode: In this mode, turning the ARC CONTROL clock
wise from –10 (soft) to +10 (crisp) changes the arc from soft and
washed-in to crisp and narrow. It acts as an inductance/pinch
control. The proper setting depends on the procedure and
operator preference. Start with a setting of 0.
12. 14-PIN AMPHENOL: Primarily used for attaching accessories,
such as a wire feeder, spool gun module or TIG module. It
provides connections to both 120VAC and 42VAC power, and to
the weld circuit work voltage sensing lead. It also provides a
connection to the same control circuits described in the 6-PIN
AMPHENOL section below.
13. 6-PIN AMPHENOL- Primarily used to connect a remote control
device, such as the K857, or a TIG Amptrol, such as the K870 or
K812.
Both the 6 and 14-Pin amphenols are connected to a remote
control auto-sensing circuit that transfers all or partial output
control functions from the front panel output control dial to the
remote output control device.
When in TOUCH START TIG mode, a remote output control device
will vary the output from MIN up to the value set with the front
panel output control dial. In all other modes, the front panel
output control is completely disabled, and full MIN to MAX control
is transferred to the remote output control device.
Both Amphenols also connect to an electronic output contactor
circuit. When the "Weld Terminals" switch is in the "remotely
controlled" position, the weld terminals are switched on and off
by the device connected to either amphenol.
NOTE: Both the 6 pin and 14 pin Amphenols share the same output control
auto-sensing and contactor circuitry; for this reason, there can only be
one device plugged into the Ranger 305D at any time.
14. WELD TERMINALS CONTROL SWITCH- In the WELD TERMINALS
ON position, the output is electrically hot all the time. In the
REMOTELY CONTROLLED position, the output is controlled by a
wire feeder or amptrol device, and is electrically off until a remote
switch is closed.
15. WIRE FEEDER VOLTMETER SWITCH: Matches the polarity of the
wire feeder voltmeter to the polarity of the electrode.
16. DIGITAL OUTPUT METERS: The digital meters allow the output
voltage ("CV-WIRE" mode) or current ("CC-STICK", "DOWNHILL
PIPE" and "TOUCH START TIG" modes) to be preset prior to
welding using the output control dial. When pre-setting voltage
the AMPS display will be off and while pre-setting amps, the
VOLTS display will be off. While welding, the machine display
both the actual voltage (VOLTS) and current (AMPS).
B 5
OPERATION