Programming The 2408 Controller - Miller Electric IH Owner's Manual

6-3-2.

Programming The 2408 Controller

Identify the "code" requirements for the heat treat.
For Preheat program refer to Figure 6-1.
For Postweld stress relief program refer to Figure 6-2.
For a complex stress relief program (multiple temperature rise and cool rates) refer to Figure 6-3.
Use worksheet in Figure 6-4 to help prepare either a pre- or post-heat temperature profile.
SEG.n
Step
StEP
( )
Dwell
dwEl
( )
Ramp Time
(rmP.t)
Ramp Rate
(rmP.r)
End
End
( )
The following parameters are available depending on the
StEP dwEl
tGt
rAtE
dur
End.t
Table 6-3. Program List Terms And Definitions
Segment number
Segment Type Definitions
The setpoint steps instantaneously from its current value to a new value.
The setpoint remains constant for a specified period.
Dwell units (dwL.U) are in hours.
The setpoint ramps linearly, from its current value to a new value, either at a
set rate (called ramp-rate programming), or in a set time (called time-to-target
programming). You must specify the ramp rate, or the ramp time, and the target
setpoint, when creating or modifying a program.
Ramp units (rmP.U) are in hours.
A program either ends in this segment or repeats. You specify which is the case
when you create or modify a program (see the final topic in this chapter). When
a program ends, the programmer is put into either a continuous Dwell state with
all outputs staying unchanged, or the Reset state.
tYPE
rmP.t rmP.r End
selected
rmP
Target setpoint for a " " or "
rmP.r
Ramp rate for a " " segment.
dwEl
Dwell time for a " " segment.
dwEl rSEt
End of prog − ,
StEP
" segment.
S OP
, .
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