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5
OTC25 L
Operation
OTC25 L Limit Controller
Normal Operation
The factory default display setting of the OTC25 L is for Actual
Temperature . The default display may be changed to
setpoint temperature by selecting Limit Setpoint at the
Default Display parameter selection.
When the Default Display is changed to Limit Setpoint, the limit
setpoint temperature may be adjusted by using the Raise or
Lower keys. The limit setpoint is adjustable from 32 to 905°
F (0 to 485° C).
When the Default Display setting is “Actual” , adjustment
of the Limit Setpoint may only be accomplished by pressing the
Parameter Key momentarily to switch the display to Limit
Setpoint, and then using the Raise or Lower Keys to
change the Limit Setpoint Value. The display will automatically
revert back to “Actual” five seconds after the last keypress.
Parameter Configuration
Your OTC25 L controller’s parameter selections are explained
on the next page, with default settings shown in Figure 5b.
To enter the configuration menu, press and hold the Parameter
key for 10 seconds until the display changes to the parame-
ter mode. Press the Parameter key again to index through the
available parameters. Pressing the Parameter Key for 3 seconds
or allowing 60 seconds of inactivity will cause the OTC25 L to
exit the menu system and return to normal operating mode.
OTC25 N
Operation
Deviation Band Alarm
A Deviation Band is a pre-set number of degrees, plus and
minus, around the Setpoint Value, ex.
+
10° F. A Deviation
Band Alarm provides an indication to the operator that the Actual
Temperature has either exceeded or dropped below the chosen
deviation. This parameter can be turned off or adjusted
from 1 to 252° F (1 to 140° C). When the process variable is out-
side the deviation band, the alarm is indicated by flashing the
display (regardless of whether setpoint or actual temperature is
displayed) and the optional alarm output is activated.
Display Units
This allows the operator to have the display indicate either
degrees Fahrenheit or degrees Celsius.