Lincoln Electric IM10018 IDEALARC DC-600 VRD - Manual (Page 16)

B-2 OPERATION B-2
IDEALARC ® DC-600 VRD
GENERAL DESCRIPTION
The IDEALARC ® DC-600 VRD includes a proprietary design which is
available in certain arc welding power sources such as the DC 600
and 400. This internal circuitry applies a high frequency, low voltage
signal through the Electrode and Work terminals, while disabling the
output of the power source. The OCV ( open circuit voltage) during
this period is less than 2 Volts RMS at 70kHz. When an Electrode to
Work load of 100 ohms or less is applied, the output of the power
source is enabled, allowing normal welding operation. When the out-
put load is removed, within 0.3 seconds, the output is again disabled
reducing the OCV to less than 2 Volts RMS
The IDEALARC ® DC-600 VRD is an SCR controlled three phase
welding and cutting power source. It uses a single range potentiome-
ter to control:
• Submerged Arc Semi-Automatic or Automatic Welding
• Open Arc Semi-Automatic or Automatic Welding
• Stick Welding
• Air/Carbon Arc Cutting (Carbon Rod Sizes up to 3/8” Diameter)
The IDEALARC ® DC-600 VRD has a three-position Welding Mode
Switch to enable the user to operate in one of three modes:
• Constant Current (CC) Stick also used for Air Carbon Arc Cutting
Process (AAC)
• Constant Voltage (CV) Submerged Arc
• Constant Voltage (CV) Innershield (also used for FCAW/GMAW)
Two VRD models are available:
• Domestic - 230/460/575V 60 Hertz model
• Export-415V 50/60 Hertz model
The optional Multi-Process Switch allows the user to switch between
semi-automatic or automatic welding and stick welding or air/carbon
arc cutting without disconnecting the wire feeder equipment control,
electrode, and work leads.
RECOMMENDED PROCESSES AND EQUIPMENT
The IDEALARC ® DC-600 VRD is designed for GMAW (MIG), FCAW,
and submerged arc (SAW) within the capacity of the machine. It can
also be used for stick welding (SMAW) and for air carbon arc (AAC)
cutting with carbon rods up to 3/8" diameter.
The IDEALARC
® DC-600 VRD is provided with a three position mode
switch that selects CV Innershield, CV Submerged Arc, or CC Stick.
The IDEALARC ® DC-600 VRD can be easily connected to wire feed-
ing equipment, including:
• Semi-automatic wire feeders LN-7*, LN-7 GMA*, LN-742, LN-8*,
LN-9*, LN-9 GMA*, LN- 10, LN-15 LN-23P, LN-25, and DH-10.
• Automatic wire feeders NA-3*, NA-5*, and NA-5R*.
• Tractors LT-56* and LT-7*
* The 14-pin MS receptacle on codes 11707 and 11725 does not provide
115VAC for these feeders; 115VAC must be obtained from terminal
strip.
DESIGN FEATURES AND ADVANTAGES
• No large output mechanical contactors or Solid State switches such
as SCRʼs, etc; are added to the Electrode to Work output circuit.
• “Tamper Resistant” design. Circuitry is built into power source, not
an exterior package which could easily be tampered with.
• No reduction of power source output rating. This feature does not
affect the rating of the power source.
• Self diagnostics upon machine power up. Indicator lights are test-
ed.
• Green lamp on when weld voltage is less than 30 volts. If weld volt-
age exceeds 30 volts, Green lamp turns off and Red lamp turns on.
• Output is disabled if OCV > 50 volts is sensed.
• Excellent arc characteristics for optimum constant voltage sub-
merged arc and Innershield welding performance.
• A control circuit designed to provide good starting for a large variety
of processes and procedures.
• Output Control Potentiometer that provides easy single range con-
tinuous control.
• Output Control Switch that provides simple switching from local to
remote control.
• Output Terminals Switch to energize output terminals either local or
remote.
• White neon pilot light to confirm that the Input Contactor is ener-
gized.
• DC Ammeter and Voltmeter
• 42VAC 10 Amp auxiliary power available for the wire feeder, circuit
breaker protected.
• Single MS-type (14 pin) connector for wire feeder.
• 115VAC 15 Amp auxiliary power available for the wire feeder, circuit
breaker protected.
• 115VAC 15 Amp duplex plug receptacle available on 60 Hertz mod-
els, circuit breaker protected.
• Multi-functional terminal strip for easy connection of wire feeding
control cables.
• Recessed, output terminals to avoid any person or object from acci-
dentally coming into contact with the output terminals and labeled "
+ " and " - " for easy identification.
• Thermostatically protected power source.
• Electronic protection circuit to protect power source against over-
loads.
• Input line voltage compensation to provide an essentially constant
output.
• SCR electronically controlled welder output provides extra long life,
especially for highly repetitive welding applications.
• Solid state 2 and 4 circuit for extra long life.
• Two circuit solid state control system provides maximum perfor-
mance and circuit protection.
• Low profile case provides maximum use of space.
• Convenient access to all controls.
• Output lead strain relief loops to prevent terminal and cable dam-
age.
• Easily removed case side, even when stacked.
• Outdoor operation because enclosure is designed with air intake
louvers that keep dripping water from entering the unit. Transformer,
SCR Bridge and choke have special corrosion resistant paint for
added protection.