Red Lion PCU - Manual (Page 36)

Protected Mode Lockouts (Code, PID, PID2, rtbS & AL)
The protected mode is active when program disable is active. The
parameters in the protected mode can be set for one of the following modes:
LOC (Lockout) – Prevents the parameter from appearing in the
protected mode.
rEd (Read only) – Parameter appears, but cannot be modified.
Ent (Entry) – Parameter appears and can be modified.
The code number allows access to the unprotected mode. To enter the
unprotected mode from the protected mode, the code number entered must
match the code number entered here. See
Front Panel Program Disable, page
19, for a description of the various program access levels.
Code – 0 to 250
PID – Permits access to the main PID parameters
PID2 S – Permits access to the secondary PID parameters
rtbS S – Permits access to Remote Setpoint ratio and bias
parameters
AL S – Permits access to the alarm value(s).
Hidden Mode Lockouts (ALrS, trnF, tUNE and SPSL)
The hidden mode is accessible from the normal display mode by pressing
and holding the PAR button for three seconds. The parameters can be set for:
LOC (Lockout) – Prevents the parameter from appearing in the
hidden mode.
ENbL (Enable) – Allows operator to perform the selected hidden
mode function.
The functions available in the hidden mode are accessible independent of
the status of program disable.
ALrS S – Reset (override) the alarm output(s).
SPSL S – Select Local or Remote Setpoint operation.
trnf – Select Automatic or Manual operation.
tUNE – Invoke or cancel Auto-Tune.
S
Note: These parameters are model specific and may not appear in the
programming sequence.
ALARM MODULE (4-AL) (OPTIONAL)
The controller may be optionally fitted with the dual alarm option (AL1
and AL2). Some models are equipped only with a single alarm (AL1). One of
three types of output modules (Relay, Logic/SSR Drive or Triac) must be
ordered separately and installed into the appropriate alarm channel socket.
The output modules may be replaced or interchanged (with appropriate
wiring considerations) at any time without re-programming the controller.
The alarm values can be accessed in configuration module (4-AL), the
unprotected mode, and in the protected mode, if not locked.
A front panel annunciator illuminates to indicate that the alarm output is on
(AL1 for alarm 1 and AL2 for alarm 2).
Note: When deviation low-acting with positive alarm value (d-LO), deviation
high-acting with negative value (d-HI), or Band inside-acting (b-IN) is
selected for the alarm action, the indicator is “OFF” when the alarm output is
“ON”. These alarm modes latch the outputs when the output is “ON”, when
selected for latched operation.
Caution: In applications where equipment or material damage, or risk to
personnel, due to controller malfunction could occur, an independent and
redundant process limit indicator with alarm outputs is strongly
recommended. Red Lion Controls offers various units (such as an IMP, IMD1
or IMD2) that may be used for this purpose. The indicators should have input
and AC power feeds independent from the other equipment.
Alarm Action (Act1, Act2)
The alarm(s) may be independently configured for one of the following
modes:
Absolute High Acting (A-Hi)
Absolute Low Acting (A-LO)
Deviation High Acting (d-Hi) ь
э
ю
Relative to Setpoint
(Local or Remote)
Deviation Low Acting (d-LO)
Band Inside Acting (b-in)
Band Outside Acting (b-Ot)
-28-