Red Lion TCU - Manual (Page 29)

HIDDEN FUNCTION MODE
The Hidden Function Mode is only accessible from the normal display
mode by pressing and holding the PAR button for three seconds. These
functions must be unlocked in Configuration Module #3. Factory settings are
locked. In this mode, these controller functions can be performed.
Local/Remote Setpoint Selection
Automatic/Manual Transfer
Initiate/Cancel Auto-tune
Reset Alarm Events
Each function may be “locked out” in the Configuration parameter
lockouts module. The PAR button is used to scroll to the desired function and
the up and down buttons are used to select the operation. Pressing the PAR
button while the function is displayed executes the function, and returns the
unit to the normal display mode. Pressing the DSP button exits this mode with
no action taken. The unit automatically returns to the normal display mode if
no action is taken.
Hidden Function Mode Reference Table
Display Parameter
Range and Units
(Factory Setting Value)
Description/
Comments
SPSL Select
Local or
Remote
Setpoint LOC - Local Setpoint
rE_t - Remote Setpoint
(LOC) Appears only for models
with Second Analog Input.
“SPtr” determines nature of
controller response.
trnF Transfer
mode of
operation Auto - Automatic control
User - Manual control
(Auto) This step does not appear
if locked (LOC). Exits to
normal display mode if
executed.
tUNE Auto-tune
invocation Yes: starts the
auto-tune sequence.
No: terminates the
auto-tune sequence.
Prl - tune primary
(Cascade)
SEC - tune secondary
(Cascade)
(NO)
This step does not appear
if locked (LOC) or exits to
normal display mode if
executed.
These parameters appear
only if Second Analog
Input Internal Cascade is
selected.
ALrS Alarm reset UP key resets Alarm 1
DOWN key resets
Alarm 2
This step does not appear
if alarm option not
installed, if locked (LOC) or
previous step performed.
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