Instruction manual

OTC25 P
O p e r a t i o n
13
OTC25 L
O p e r a t i o n
12
Limit Setpoint
The Limit Setpoint determines the temperature at which
the limit output will become inactive, interrupting power to
the process. It is operator-selectable from 32° to 905° F
(0° to 485° C).
Automatic Startup Reset
The automatic startup reset feature allows the limit output to be
automatically reset at startup or to be latched at startup. In the
latter condition, the limit output will have to be manually reset
before the limit output will be activated (relay closed allowing
power to flow to process heaters or coolers)
.
Display Units
This allows the operator to have the display indicate either
degrees Fahrenheit or degrees Celsius.
OTC25 P PID Temperature Controller
Normal Operation
The factory default display setting of the OTC25 P is for Actual
Temperature . The default display may be changed to
setpoint temperature by selecting Setpoint at the Default
Display parameter selection. When the Default Display is
changed to Setpoint, the setpoint temperature may be adjusted
by using the Raise or Lower keys. The setpoint is
adjustable from 0 to 999° F (-17 to 537° C).
When the Default Display setting is “Actual” , adjustment
of the Setpoint may only be accomplished by pressing the
P a r a m e t e r Key momentarily to switch the display to
Setpoint, and then using the Raise or Lower Keys
to change the Setpoint Value. The display will automatically
revert back to “Actual” five seconds after the last keypress.
Parameter Configuration
Your OTC25 P controller’s parameter selections are explained
on the next page, with default settings shown in Figure 5c.
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 P to
exit the menu system and return to normal operating mode.