CV-655
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B-6
OPERATION
B-6
CASE BACK CONNECTIONS
220VAC AUXILIARY
RECEPTACLE
(European and Export Models)
This receptacle provides up to 2 amps of 220VAC aux-
iliary power for a water cooler.
220VAC 2 AMP
CIRCUIT BREAKER
(European and Export Models)
This breaker protects the 220VAC auxiliary circuit
located in the 220VAC receptacle.
When using a CV-655 with wire feeders, there will be a
small spark if the electrode contacts the work or
ground with several seconds after releasing the trigger.
When used with some wire feeders with the electrical
trigger interlock in the ON position, the arc might
restart if the electrode touches the work or ground dur-
ing these several seconds.
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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-655 machines can also supply 115 volt AC auxiliary
power through the wire feeder receptacle. A 20 amp
circuit breaker on the Domestic model, and a 15 amp
on the Canadian and Export models protects the 115
volt circuit from overloads. 115VAC is not available in
the MS-receptacle on the European models.
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-655 auxiliary power for that equip-
ment.
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CAUTION
THERMAL FAN CONTROL
The machine’s cooling fan remains off when the tem-
perature of the rectifiers and windings inside the
machine are below that requiring air flow cooling, as
determined by electronic monitoring of several thermal
sensors and the welding current of the machine. The
fan may remain off until welding begins, but once the
fan is activated, it will remain on for at least 5 minutes
to assure proper cooling. This feature saves energy
and also minimizes the amount of dirt and other air
borne particles being drawn into the machine.
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.
The CV-655 also has over-current protection. When
the load exceeds a threshold current (about 900
amps), overcurrent shut down will occur after a period
of time that shortens as the current increases beyond
this threshold. If the current reaches about 1000 amps
the output will be “clamped” at about 1000 amps and
shut down will occur in about 5 seconds. When this
overload shut down occurs the short circuit output of
the machine drops to only about 20 amps, but the input
contactor and input pilot light will remain on until reset
by turning the power switch off, then back on with over-
load removed.
FAN MOTOR FUSE
(EUROPEAN MODEL)
A 10 amp slow blow fuse protects the fan motor circuit.
This fuse is located inside the CV-655 mounted on the
fan motor bracket.
CAUTION
