Miller Maxstar 300 LX Owner's Manual page 45

3T Specific Trigger Method
D.
Current (A)
*
A
Preflow
Initial Amps /Initial Slope
* Arc can be extinguished at any time by pressing and releasing both initial and final switches, or by lifting the torch and breaking the arc.
1 3T (Specific Trigger Operation)
Sequencer is required to reconfigure for 3T.
3T requires a specific type of remote con-
trol with two independent momentary-
contact switches. One will be designated
initial switch, and it must be connected be-
tween Remote 14 receptacle pins A and B.
The second will be designated as the final
switch, and it must be connected between
Remote 14 receptacle pins D and E.
Select 3T according to Section 6-2C.
Definitions:
Initial slope rate is the rate of amperage
change determined by the initial amperage,
initial slope time, and main amperage.
Final slope rate is the rate of amperage
change determined by the main amperage, fi-
nal slope time, and final amperage.
SEL
Remote Trigger Operation
*
*
*
B C
Main Amps
Operation:
A..Press and release initial switch within 3/4
second to start shielding gas flow. To stop
the preflow sequence before preflow time
elapses (25 seconds), press and release
final switch. The preflow timer will reset
and the weld sequence can be started
again.
.
If an initial switch closure is not made
again before preflow time ends, gas flow
stops, the timer resets, and an initial
switch press and release is necessary to
start the weld sequence again.
B..Press initial switch to start arc at initial
amps. Holding switch will change amper-
age at initial slope rate (release switch to
weld at desired amperage level).
1
H-3
*
*
D
Final Slope /Final Amps
C..When main amperage level is reached,
D..Press and hold the final switch to de-
E.. When final amperage has been reached,
Application:
With the use of two remote switches instead
of potentiometers, 3T gives the operator the
ability to infinitely increase, decrease, or
pause and hold amperage within the range
determined by the initial, main, and final am-
perages.
*
E
Postflow
initial switch can be released.
crease amperage at final slope rate (re-
lease switch to weld at desired amperage
level).
the arc extinguishes and shielding gas
flows for the time set on the Postflow con-
trol.
OM-2222 Page 39