Lincoln Electric IM481-B - Manual (Page 12)

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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