Miller ProHeat 35 OM-222 166F, Owner'S Manual

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OM-222 166 Page 28
Maximum Temperature Message Screen
Cannot enter Run mode
Programmed temperature settings
exceed air cooled limits
(400
_
F, 204
_
C)
6-4-1-3. PWHT (Post-Weld Heat Treat)
The post-weld heat treat process allows the operator to program a post-weld heat treat where ramp temperature
(on increase and decrease) and ramp rates are the same. When this process is selected, the following screen
appears on the display:
Mode......: PWHT
Control TC:>1,2
Ramp Temp.: 200 Ramp Rate: 600
_
/Hr
Soak Temp.: 400 Soak Time: 01:00:00
PWHT Screen
The default position of the cursor is next to Control TC. Press the Increase or Decrease button to
select the number of control thermocouples to be used for the program. Selections are as follows: 1, 1,2, 1,2,3, or
1,2,3,4. TC1 MUST always be a control thermocouple. TC2 thru TC4 can be used for controlling or monitoring.
When a thermocouple is selected as control, the LED adjacent to the seven-segment display illuminates.
Use the Cursor button to move the cursor to the desired selection (Ramp Temperature, Ramp Rate, Soak
Temperature, or Soak Time), and press the Increase or Decrease button to change the value to the
desired setting.
Figure 6-1. Soak Parameters
Soak Temp
Soak Time
Ramp Rate
Ramp Temp