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AEC/Appllcatlon Engineering
5-6
Changing Fahrenheit to Celcius
You can easily convert the control from the factory-set degrees Fahrenheit (°F) setting to
degrees Celcius (°C).
0
Disconnect main electrical power to the True Temp™ unit.
611 Press up the latch at the bottom of the front panel and slide
out the control chassis.
0
Locate the DIP switch labeled
SW201 (FUNCTION)
on the
right circuit board. Slide Switch
5
to
OFF.
611 Slide the chassis back into the control housing.
I
I
I
4
I
I
0 Cover the °F label with the
°C
sticker included in your information packet.
5-7
Changing the Set Point
To change the process temperature set point:
•
Press
I
@
I
to raise the set point.
•
Press
I
~
I
to lower the set point.
5-8
Communications
For RS-232, RS-422, RS-485, and SP! communications, a connection port on the electrical
cabinet permits easy connection to the host computer. The connection port is a direct pin-to-pin
extension from the plug on the back of the controller. For pin outs, consult the Communication
booklet.
5-9
Auto-Tune Procedure
The Auto-Tune feature lets you fine-tune the control PID to process requirements. Auto-tune the
control PID whenever the process under control changes.
Don't be alarmed by control response. The process temperature may go above and below set
points as many as three times. It then levels off and controls fluid temperature to the process set
point. Allow at least 15 minutes to run the Auto-Tune sequence; you should do so before you run
any process.
Page 38
TOH True Temp"' Serles Hot 011 Temperature Control Units
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