9
Element Life & Proper Control Setup
(This is published by the element wire manufacturer. It is considered typically and not a guarantee on heater life)
The
typical
life of an
Tutco SureHeat Hot Air Tool
is directly based on the temperature of the filament wire.
The curve below shows that 5000 hours of life can be obtained by maintaining a filament temperature below
1900°F. Also note that the element does not fail until it reaches more than 2200°F!
•
Tutco SureHeat
process air heaters contain high watt-density elements and must be
controlled
carefully to prevent element failure.
•
Sudden applications of power can damage heater and void warranty.
•
Following each of these guidelines will help to ensure safe heater operation.
Start the heater with a 0º (F or C) Set-Point (SV):
This will ensure the output signal to the power control
starts off low (0% output) before the contactor is engaged and immediately applying full power.
Use proper closed loop control (PID) settings
.
Tutco SureHeat
typically uses the following PID;
Proportional (P),
Integral (I) and Derivative (D); settings as a starting point for stable temperature control.
Some manual tuning
may be required for more precise control.
Description: Range:
Default:
(P)
roportional
90-250
131
(I)
ntegral
8-20
9
(D)
erivative
0-2
2
Scan/Cycle Rate
< 500mSec
200mSec
Incorporate a Ramp Rate for the start-up of the heater
. The slower you ramp to your final set-point the
less overshoot and problems you will have.
Tutco SureHeat process
heaters should be ramped up
to
temperature
over a period of
several minutes. The following are recommended ramp rates based on final
temperature.
(For custom ramp rates
consult with factory)
Set-Point Temperature
Degrees per Minute
Up to 600ºF (up to 300ºC)
360ºF (150ºC)
601-1000ºF (301-500ºC)
240ºF (100ºC)
1001-1400ºF (501-760ºC)
120ºF (50ºC)
Up to1650ºF (up to 900°C)
60ºF (25ºC)
Summary of Contents for F068462
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