Carbolite TLD Series - Manual (Page 4)

TLD
4
MF18 – 3.06
3.0 O PERATING I NSTRUCTIONS
3.1 Operating Program
The program consists of the stages shown in the graph below. The rates of temperature rise, dwell
temperature and dwell times are all adjustable by the user. The general format of the program is
installed at the manufacturing stage, with initial values as shown in the table below.
function initial setting program
1 Start.
2 Heat at a controlled rate. heat up at 480°C/hour to 300°C SEG.n 1
tGt
rAtE rmP.r
300°C
8°C per min
3 Dwell for a preset period. dwell at 300°C for 1 hour SEG.n 2 dweLL
1 hour
4 Cool at a controlled rate. Cool to 80°C assisted by inlet
blower SEG.n 3
tGt
rAtE rmP.r
80°C
20°C per min
5 Dwell for a preset period. 80°C for 12 hours SEG.n 4 dweLL
12 hours
6 Cool naturally to room
temperature.
SEG.n 5 SteP
0°C
7 Finish. SEG.n 6 End
This program causes the oven to heat up at 480°C per hour to a temperature of 300°C. The
temperature remains at 300°C for 1 hour. At the end of the 1 hour the setpoint changes to 80°C
and the oven cools down as quickly as possible to this temperature. The rate of cooling is quite fast
because of the air inlet blower which is incorporated in the oven. When the chamber temperature
reaches 80°C the second dwell period starts and the oven remains at 80°C for 12 hours. At the end
of 12 hours the heaters are switched off and the oven cools naturally to room temperature.
3.2 Controls
The instructions for operating the temperature controller are given in a separate manual.
The oven is fitted with an instrument switch. The switch cuts off power to the controller(s).
The circulation fan operates when the instrument switch is switched on.
Connect the oven to the electrical supply.
Operate the instrument switch to activate the temperature controller. The controller becomes
illuminated and goes through a short test cycle.
Adjust the temperature – see the controller manual.
Overtemperature Option: If the overtemperature controller has not yet been set as required, set it
and activate it according to the instructions in the appropriate manual.
The oven starts to heat up according to the set program.
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