Starting The Machine; Adjusting The Output Voltage Using The Digital Meter; Local/Remote Switch Operation; Auxiliary Power - Lincoln Electric IDEALARC CV-300 Operator's Manual

B-6

STARTING THE MACHINE

The power switch at the extreme right side of the con-
trol panel energizes the CV-300.
ADJUSTING THE OUTPUT VOLTAGE
USING THE DIGITAL METER
The digital meters in the CV-300 incorporate a voltage pre-
set function. This allows the operator to set the desired
welding voltage before striking an arc. The digital meters
can also display welding current.
To make use of the voltage preset function, the Volts/Amps
switch must be in the "Volts" position. Turn the Voltage
Adjust knob until the digital meter displays the desired weld-
ing voltage. (See below if an external power source remote
control is installed.)
When an arc is struck, the digital meter displays the actual
welding voltage, as measured at the CV-300 output termi-
nals.
NOTE: The arc voltage at the electrode may be as much as
two volts different from the CV-300 output terminal
voltage. This is due to voltage drops present in the
welding cables, cable connections, and welding
gun. To minimize these drops, use cables of ade-
quate capacity, and make sure all connections are
clean and tight. Because of these voltage drops,
you may have to preset the CV-300 for a slightly
higher welding voltage than your procedure calls for.
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 INSTALLA-
TION section), place the Local/Remote switch (see Figure
B.1) in the "Remote" position. The remote control now con-
trols the output voltage, in the manner described above.
This control may be adjusted while welding to change the
CV-300 output.
OPERATION

AUXILIARY POWER

42 volt AC auxiliary power, as required for some wire
feeders, is available through the wire feeder recepta-
cle. A 10 amp circuit breaker protects the 42 volt cir-
cuit from overloads.
CV-300 machines can also supply 115 volt AC auxil-
iary 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.)
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 equip-
ment.
___________________________________________

OVERLOAD PROTECTION

This welder has thermostatic protection from exces-
sive 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 illumina-
tion 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
CAUTION
B-6