Miller Electric ProHeat 35 - Manual (Page 34)

OM-222 166 Page 28
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
.
The minimum and maximum ramp temperature settings for PWHT are 0 and 14505 F (−18 and 7885 C). The minimum and maximum ramp rates
are 10 and 99995 F/hr (6 and 55555 C/hr). The minimum and maximum soak temperatures are 0 and 14505 F (−18 and 788 5 C). The minimum
and maximum soak times are 0 and 100 hours. When the system is utilizing air-cooled blankets, the maximum temperature setting is 4005 F (2045
C). If the program setting is above 4005 F (2045 C), the following screen will appear on the LCD display when the Run button is pressed.
Maximum Temperature Message Screen
Cannot enter Run mode
Programmed temperature settings
exceed air cooled limits
(400 _F, 204 _C)
6-4-1-4. Custom Program
In Custom Program, the operator can create a custom program with multiple steps or nonsymmetrical heat treat programs where the heating and
cooling rates and temperatures are different. When this process is selected, the following screen appears on the display:
.
This is the screen for initial use of the system. Subsequent use of custom program will revert to the last program used.