Miller Electric IH - Manual (Page 25)

OM-203 185 Page 21
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.
Table 6-3. Program List Terms And Definitions
SEG.n Segment number
Segment Type Definitions
Step
( StEP )
The setpoint steps instantaneously from its current value to a new value.
Dwell
( dwEl )
The setpoint remains constant for a specified period.
Dwell units (dwL.U) are in hours.
Ramp Time
(rmP.t)
Ramp Rate
(rmP.r)
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.
End
( End )
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.
The following parameters are available depending on the tYPE selected
StEP dwEl rmP.t rmP.r End
tGt √ √ √ Target setpoint for a “ rmP “ or “ StEP ” segment.
rAtE √
Ramp rate for a “ rmP.r ” segment.
dur √ √
Dwell time for a “ dwEl ” segment.
End.t √
End of prog − dwEl , rSEt , S OP .