Red Lion TLA - Manual (Page 10)

10
LIMIT OUTPUT ACTION
The limit output is selectable for high or low trip activation. If the process
temperature goes above the limit setpoint for a high trip, or below the limit
setpoint for a low trip, the limit relay will de-energize to initiate a process
shutdown. The limit output cannot be reset until the process temperature returns
to the proper operating range; manual reset is required. The following action
figures describe the status of the limit output and the front panel indicators for
various over/under setpoint, and reset conditions. Reset is either by the front
panel R button, if enabled, or by the Remote Reset input, terminal #6. Refer to
Configure Module 2 - Output Parameters for details of configuring the limit
output. Refer to Configure Module 3 - Lockout Parameters for details of
configuring the front panel Reset button.
Process Temp
Annunciator
Annunciator
Limit
Output
OUT
Setpoint
Reset
EXceed
OFF
OFF
OFF
Energized
De-energized
ON
ON
ON
OFF
OFF
ON
OFF
Energized
High Trip Action
Low Trip Action
5.0 A
LARMS
(O
PTIONAL
)
The alarm action figures describe the status of the alarm output and the front
panel indicator for various over/under temperature conditions. The alarm output
wave form is shown with the output in the automatic reset mode. Select the
alarm action with care -- in some configurations, the front panel indicator (LED)
might be OFF while the output is ON. Refer to Configure Module 4 - Alarm
Parameters for details of configuring the alarms.
OUTPUT OFF
LED OFF
OUTPUT ON
LED ON
OUTPUT OFF
LED OFF
OUTPUT ON
LED ON
TEMP
ABSOLUTE HIGH-ACTING ALARM (A-HI)
AL
HYS
Setpoint
Reset
Annunciator
Limit
Output
OUT
EXceed
Annunciator
Process Temp
Energized
OFF
OFF
OFF
De-energized
ON
ON
ON ON
OFF
OFF
Energized
OFF
AL
ABSOLUTE LOW-ACTING ALARM (A-LO)
TEMP
LED ON
OUTPUT ON
LED OFF
OUTPUT OFF
LED ON
OUTPUT ON
LED OFF
OUTPUT OFF
HYS
OUTPUT OFF
LED OFF
OUTPUT ON
LED ON
OUTPUT OFF
LED OFF
OUTPUT ON
LED ON
INPUT
DEVIATION HIGH-ACTING WITH POSITIVE ALARM VALUE (d-HI)
SP + AL
SP
HYS
SP + (-AL)
DEVIATION HIGH-ACTING WITH NEGATIVE ALARM VALUE (d-HI)
INPUT
LED OFF
OUTPUT ON
LED ON
OUTPUT OFF
SP
HYS
OUTPUT ON
LED OFF
OUTPUT OFF
LED ON