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AEC/Appllcatlon Engineering
DOWN Key
The key with the arrows pointing down lets you lower the process set point temperature. During
setup, it lets you decrease the value of the parameter displayed by the
PV
(process value) LED.
UP Key
The key with the arrows pointing up lets you raise the process set point temperature. During
setup, it lets you increase the value of the parameter displayed by the
PV
(process value) LED.
AT Key
When you press this key for one second or more, you start the Auto-Tune sequence.
See Section 5-9 on Page 38 for more information.
5-4
Control Internal Switches
The control is set up and tested at the factory for optimum operation, and you don't need to
adjust internal switches.
If
the control does not work properly, or you suspect someone has
accidentally changed some settings, you can do two things. First, perform the Auto-Tune
Procedure listed in Section 5-9 on Page 38. If that doesn't work, restore the control to the
original factory settings listed in Section 6-5 on Page 44 for more information .
5-5
Control Anti-Tamper Lockout Switch (SW101)
This slide switch prevents unauthorized changes to the controller, allowing only the process set
point to be changed and alarm settings to be viewed. When you move this switch to
ON,
you
disable the
LEVEL and AT
keys. TrueTemp™ Series TDH temperature control units are factory
set with protection turned
OFF.
To set tamper protection:
6ZI Disconnect main electrical power to the TrueTemp™ TDH unit.
6ZI Press up the latch at the bottom of the front panel, then slide out the control chassis.
6ZI Locate the slide-type switch labeled
Protect (SW101)
on the left circuit
board. Slide it to
ON.
6ZI Slide the chassis back into the control housing.
Tam per protection is now set.
TOH True Temp"' Serles Hot
on
Temperature Control Units
OF•I
ION
Prataet
ISW101)
Page 37
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