Lincoln Electric IDEALARC CV-305 - Manual (Page 19)

OPERATION B-7 B-7
IDEALARC® CV-305
STARTING THE MACHINE
The power switch at the extreme right side of the con-
trol panel energizes the CV-305.
ADJUSTING THE OUTPUT VOLTAGE
USING THE DIGITAL METER
The digital meters in the CV-305 incorporate a voltage preset
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-305 output termi-
nals.
NOTE: The arc voltage at the electrode may be as much as
two volts different from the CV-305 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 adequate
capacity, and make sure all connections are clean
and tight. Because of these voltage drops, you may
have to preset the CV-305 for a slightly higher weld-
ing 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 when-
ever an arc is struck.
LOCAL/REMOTE SWITCH OPERATION
If voltage control is desired at the CV-305, the Local/Remote
switch must be in the "Local" position. The Voltage Adjust on
the front panel can be used to adjust the CV-305 output.
(The remote control, even if connected, will have no effect if
the switch is in the "Local" position).
To use a wirefeeder that has remote control capability or a
remote control, such as the K857 (see
INSTALLATION sec-
tion), place the Local/Remote switch (see
Figure B.1) in the
"Remote" position. The remote control now controls the out-
put voltage, in the manner described above. This control
may be adjusted while welding to change the CV-305 output.
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-305 machines can also supply 115 volt AC auxiliary
power through the wire feeder receptacle. A 5 amp cir-
cuit breaker protects the 115 volt circuit from over-
loads.
NOTE: Do not use circuits 2 or 4 for control of auxiliary
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 sig-
nificantly higher than their running current. These high-
er starting currents may cause the circuit breaker to
open. If this situation occurs, the user should refrain
from using the CV-305 auxiliary power for that equip-
ment.
___________________________________________
OVERLOAD PROTECTION
This welder has thermostatic protection from excessive
duty cycles, overloads, loss of cooling, and high ambi-
ent 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 yel-
low 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.
CAUTION
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