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manual abstract
To read welding current, set the Volts/Amps switch to the "Amps" position. The welding current will be displayed whenever an arc is struck. LOCAL/REMOTE SWITCH OPERATION If voltage control is desired at the CV-300, the Local/Remote switch must be in the "Local" position. The Voltage Adjust on the front panel can be used to adjust the CV-300 output. (The remote control, even if connected, will have no effect if the switch is in the "Local" position). To use a remote control, such as the K857 (see INSTALLATION section), place the Local/Remote switch (see Figure B.1) in the "Remote" position. The remote control now controls the output voltage, in the manner described above. This control may be adjusted while welding to change the CV-300 output. 42 volt AC auxiliary power, as required for some wire feeders, is available through the wire feeder receptacle. A 10 amp circuit breaker protects the 42 volt circuit from overloads. CV-300 machines can also supply 115 volt AC auxiliary power through the wire feeder receptacle. A 5 amp circuit breaker protects the 115 volt circuit from overloads. NOTE: Do not use circuits 2 or 4 for control of auxil iary loads. (The 2-4 circuit is isolated from the 31-32 and 41-42 circuits.) CAUTION Note that some types of equipment, especially pumps and large motors, have starting currents which are significantly higher than their running current. These higher starting currents may cause the circuit breaker to open. If this situation occurs, the user should refrain from using the CV-300 auxiliary power for that equipment. OVERLOAD PROTECTION This welder has thermostatic protection from excessive duty cycles, overloads, loss of cooling, and high ambient temperatures. When the welder is subjected to an overload or loss of cooling, a thermostat will open. This condition will be indicated by the illumination of the yellow Thermostatic Protection Light on the case front (see Figure B.1).The fan will continue to run to cool the power source. No welding is possible until the machine is allowed to cool and the Thermostatic Protection Light goes out. CV-300 C-1 C-1 ACCESSORIES FACTORY INSTALLED OPTIONS/ACCESSORIES There are no factory installed options/accessories on the CV-300. FIELD INSTALLED OPTIONS REMOTE VOLTAGE CONTROL (K857) The K857 consists of a control box with 25 feet (7.6 m) of four conductor cable. Installation of a K857 Remote Voltage Control in the CV-300 requires a K864 Remote Control Adapter. Refer to the instructions provided with the K857 for hookup to the CV 300. When properly connected, and with the CV-300 Local-Remote Switch in the "Remote" position, the K857 functions the same as the CV-300 Voltage Adjust control, enabling minimum to maximum output voltage adjustment of the CV-300. UNDERCARRIAGE (K835) Includes front casters, a handle, a bracket, and a rear wheeled platform that is capable of carrying one gas cylinder. The CV-300 lifting eye is not functional with the K835 undercarriage installed. TWO-CYLINDER UNDERCARRIAGE (K874) Platform type undercarriage that can accommodate either one or two gas bottles, or one gas bottle and a Magnum water cooler. The CV-300 lifting eye is not functional when the K874 undercarriage is installed. WIRE FEEDER SWIVEL MOUNT (K178-1) Allows an LN-7 or LN-742 to be securely mounted on the roof of a CV-300. UNIVERSAL ADAPTER (K867) Provides a means of connecting auxiliary equipment to the wire feeder receptacle on the CV-300 power source. Consists of a 14-pin MS-type (Amphenol) plug with 8 inch (0.2 meter) long flex leads, one for each circuit present in the wire feeder receptacle. Not required when using a standard wire feeder input cable, such as a K480, with a Lincoln wire feeder. COMPATIBLE LINCOLN EQUIPMENT The CV-300 is intended for use with the LN-7, LN-742, and LN-25 wire feed units. Use the Cables / Kits listed below to make connection easily: LN-7 / LN-7GMA Requires K480 Input Cable LN-25 Requires K484 Jumper Plug Kit LN-25 w/K444-1 Remote Voltage Control Kit Requires K864 Remote Control Adapter and K484 Jumper Plug Kit LN-742 / LN-742H Requires K591 Input Cable CV-300 D-1 D-1 MAINTENANCE SAFETY PRECAUTIONS MACHINE AND CIRCUIT PROTECTION WARNING ELECTRIC SHOCK can kill. • Only qualified personnel should perform this maintenance. • Turn the input power OFF at the disconnect switch or fuse box before working on this equipment. • Do not touch electrically hot parts. GENERAL MAINTENANCE 1. The fan motor has sealed bearings which require no service. 2. In extremely dusty locations, dirt may clog the air channels causing the welder to run hot with premature tripping of thermal protection. Blow out the welder with low pressure air at regular intervals to eliminate excessive dirt and dust build-up on internal parts. The CV-300 Control PC Board has built-in diagnostic routines to alert the operator when trouble exists. When a trouble condition occurs, the CV-300 meter will display an error code, in the form "EXX", where "XX" refers to a sp...