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The CV 500-I Diode option is required to utilize the cold start and cold electrode sensing features of the NA-3, NA-5 and NA-5R. * The 14 pin receptacle of the European model does not provide 115 VAC for these feeders.. ** Use K350 Adapter Kit. DESIGN SUMMARY Operational Features & Controls ARC CHARACTERISTICS Through the unique combination of the transformer, three phase semiconverter rectifier, capacitor bank, and output choke design, in conjunction with the solid state control system, an outstanding constant voltage welding performance is achieved with a fixed pinch setting optimized for the most popular arc characteristics. OUTPUT VOLTAGE CONTROL The OUTPUT voltage control, a small 2 watt potentiometer, is calibrated from 1 to 10. MACHINE OUTPUT CONTROL SWITCH “LOCAL OR “REMOTE The machine output voltage can be controlled by either the “OUTPUT CONTROL” on the machine control panel, the output control on the wire feed unit, or an optional “remote control” that is available. This switch selects the mode of control, either “LOCAL” or “REMOTE”. POLARITY SELECTION Polarity selection is made by appropriately connecting the electrode and work welding cables to either the “+” stud or to the “-” stud. Select “VOLTMETER” switch for “+” or “-” electrode, for the remote (#21) work sensing lead. VOLTMETER SWITCH “+ ELECTRODE OR “ELECTRODE This switch selects electrode polarity for the remote (#21) work sensing lead of automatic or semiautomatic equipment. 115 VOLT POWER SWITCH The power input contactor operates from an auxiliary 115 volt transformer that is energized through the POWER toggle switch on the machine control panel. “ I ” is on and “0” is off. PILOT LIGHT A white light on the machine control panel indicates when the power source input contactor is closed. This means the main power transformer and all auxiliary and control transformers are energized. THERMAL PROTECTION LIGHT An amber light on the machine control panel indicates when either of the two protective thermostats have opened. Output power will be removed but input power will still be applied to the machine. INPUT CONTACTOR The power source is equipped with an input contactor. – 12– AUXILIARY POWER CONNECTIONS The power source is equipped to furnish nominally 115 volt AC and 42 volt AC auxiliary power for operating wire feeding equipment, etc. The auxiliary power is available at the 14-pin MS-style connector receptacle on the control panel and/or at a terminal strip behind the hinged control panel on the front of the power source. 115V AC is available at receptacle pins A and J, (except on European model), and terminals 31 and 32. 42V AC is available only at receptacle pins I and K. The 115V AC and the 42V AC are isolated circuits and each is protected by a 10 amp circuit breaker. REMOTE CONTROL CONNECTIONS Remote control connections are available both at a 14-pin connector receptacle located on the control panel, and on terminal strips with screw connections located behind the hinged control panel on the front of the power source. WATER COOLER CONNECTOR A Continental European receptacle (220V Schuko type) is located on the rear panel for supplying 220VAC to a water cooler. A 2 amp circuit breaker which is also located on the rear panel protects this circuit. OUTPUT CONNECTIONS The output terminals are recessed on the case front and labeled “+” and “-”. The CV 500-I provides Twist- Mate™ European connector receptacles. K852 Twist-Mate European connector plugs are available for the cable size to be used. The Export model includes two Twist-Mate plugs for 2/0 -3/0 (7095mm2) cable and S18737 installation instructions. INPUT CONNECTIONS The three input lines are brought in through the rear panel of the power source and attached to the input contactor. Removal of the removable access panel makes the contactor accessible for the input cable connections. INPUT LINE VOLTAGE COMPENSATION The power source is equipped with input line voltage compensation as standard. For a line voltage fluctuation of ±10% the output will remain essentially constant. This is accomplished through the feedback network in the control circuit. SOLID STATE OUTPUT CONTROL The output of the welder is electronically controlled by SCR’s instead of mechanical contactors, providing extra long life for highly repetitive welding applications. SOLID STATE CONTROL SYSTEM The Control PC Board is located behind the control panel which hinges down for easy access to the board. The Snubber PC Board is mounted on the back of the case front. MACHINE COOLING The fan pulls air in through the louvered front of the machine over the internal parts and exhausts out the louvered rear of the machine. The fan motor is fully enclosed, has sealed ball bearings, requires no lubrication, and operates when the power switch is turned on. CASE FEATURES The machine uses a 32” (813mm) long base. The low profile case facilitates installation of the machine under a workbench and stacking the machines three high to ...