MK Products Cobramatic II - Manual (Page 12)

Cobramatic ® II Owner's Manual - Page 5
the weld wire feed rate without turning Posa Start off. The contactor is not
activated during "Wire Inch".
(NOTE: If the wire feed speed is set to accept a remote source, and no input
command voltage is present, no wire feed will occur).
T
ORCH
E
LECTRICAL
R
ECEPTACLE
The Cobramatic ® II has a 7 pin “W” clocked Amphenol connector to provide
an electrical connecting point to the torch. See specifi cations for more
information.
C
ABINET
W
IRE
F
EED
S
PEED
P
OTENTIOMETER
(O
PTIONAL
- P/N 005-0166)
By selecting the cabinet potentiometer, the wire feed speed may be adjusted
from the cabinet. See wire speed source, section 9.4. The counter dial
directly reads in inches per minute (0 to 1000 IPM).
P
OWER
C
ABLE
I
NLET
The Power Inlet provides access to the power block fi tting inside the cabinet.
C
ONDUIT
I
NLET
The Conduit Inlet provides access to the slave motor outlet guide.
S
HIELDING
G
AS
I
NLET
Provides access to the gas fi tting inside the cabinet.
C
ONTROLS FOR
O
PTIONAL
T
IMER
K
IT
(P/N 005-0196)
W
ATER
I
NLET
Provides access to make the gun water connection to recirculator hose.
G
AS
P
URGE
The Gas Purge button operates the gas solenoid in the cabinet. When the
solenoid in the cabinet is used, a modifi ed gas valve, P/N 431-1080, must
be installed in the torch.
P
RE
-P
URGE
The smaller knob on the pre/post purge control may be turned clockwise to
increase the pre-purge interval. The control cannot be turned off and provide
a range of approximately .07 to 3.4 seconds. When the trigger is depressed,
the gas solenoid will open, and all other functions will be inhibited until the
end of the pre-purge interval, when normal welding will start. If the trigger is
released during pre-purge, no weld will be initiated.
P
OST
-P
URGE
The larger knob on the pre/post purge control may be turned clockwise
to increase the post-purge interval. This control cannot be turned off and
provides approximately .07 to 4.5 seconds of post fl ow. The post-purge will
not activate unless an arc has been established.
B
URN
B
ACK
The larger knob on the spot time/Burn-back control may be turned clockwise
to increase the burn-back interval. During this interval, all functions except
wire feed are maintained and, thus, the arc burns the wire back towards the
tip. Excessive burn-back may result in damage to the contact tip. The burn-
back control must be clicked on and is adjustable from .015 to .085 seconds.
The burn-back control is not activated until an arc has been established.
S
POT
T
IME
The spot timer has the capability to time and terminate a weld cycle following
a trigger ON command. The spot time function is initiated once the arc is