General Machine Description

The CV 500-I is an SCR controlled three phase DC power source. It is designed with a single range potentiometer control.

The CV500-I has two models - an Export model and a European model. The Export model complies with NEMA EW 1 requirements and the European model complies with IEC 974-1 requirements.

RECOMMENDED PROCESSES & EQUIPMENT

The CV 500-I is supplied as a constant voltage power source only. It is designed for all Innershield®, Outershield® and all solid wire and gas procedures within the capacity of the machine. The output char- acteristics have been optimized for these CV process- es without use of a variable arc control.

The CV 500-I is designed to be used with the LN-7*, LN-7 GMA*, LN-8*, LN-9*, LN-9 GMA*, LN-22, LN-23P**, LN-25, or LN-742 semiautomatic wire feed- ers, the NA-3*,NA-5* and NA-5R* automatics within the capacity of the machine. The CV 500-I Diode option is required to utilize the cold start and cold elec- trode 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 characteris- tics.

OUTPUT VOLTAGE CONTROL

The OUTPUT voltage control, a small 2 watt poten- tiometer, 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 con- trol 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 semiautomat- ic 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.

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