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3.7.8 HIGH TEMPERATURE SENSOR ALARM FILTER TIME SETTING (V3.11 AND UP)
Purpose: The
HIGH TS ALARM FILTER will prevent HIGH TS 1 and/or HIGH TS 2 ALARMS from being
indicated until their corresponding alarm condition has existed for the duration of the
HIGH TS
ALARM FILTER
time.
Range: 0 to 999 minutes
Procedure: Adjust the
HIGH TS ALARM FILTER time to the desired value. Note that either the HIGH
TS 1 ALARM
and/or the HIGH TS 2 ALARM must be enabled in order to adjust the HIGH TS ALARM
FILTER
time.
Notes:
• If an alarm condition appears and then disappears before the alarm filter time has expired,
the filter timer is reset and the alarm condition must exist again for the entire alarm filter time
before the corresponding alarm will be indicated.
• If the user resets an alarm while the alarm condition is still exists, the alarm will not be indi-
cated again until the entire alarm filter time has expired.
• The
HIGH TS ALARM FILTER time setting does not affect the cutout time when the HIGH LIMIT
CUTOUT
feature is enabled.
3.7.9 LATCH TEMPERATURE SENSOR ALARMS SETTING
Purpose: This allows for the selection of automatic clearing of all
HIGH and LOW TS ALARMS
(non-latching) when a temperature alarm condition no longer exists or permanent alarming of
such a condition (latching) until the alarm is manually reset.
Setting:
YES (LATCHING) or NO (NONLATCHING)
Procedure: Adjust the LATCH TS ALARMS setting to the desired mode (latching or nonlatching).
Notes:
• If your application is subject to periodic situations where cold or hot product is part of the
process, it may be appropriate to configure the
HTC for nonlatching temperature alarms to
avoid nuisance alarms. If it is important to be aware of any temperature alarm conditions that
may have existed in a pipe, the
HTC should be configured for latching temperature alarms.
• This setting does not affect the
TS FAILURE ALARMS; these are always latching.
3.7.10 CONTROL TEMPERATURE SENSOR FAILURE ALARM
Purpose:
CONTROL TS FAILURE ALARM indicates a failure of the temperature sensor designated as
the control sensor.
One of eleven
TS CONTROL MODES may be selected. These modes determine which TS INPUT and/
or
EXT. INPUT is designated to provide the control temperature. See section 3.5.12 on page 24 for
a full description of the temperature sensor control designations.
Alarm Mask:
ENABLE or DISABLE
Procedure: Enable or disable the alarming of a failure of the designated control temperature sen-
sor as required.
Note: This alarm should always be enabled. If the controller experiences a
CONTROL TS FAILURE it
will turn the output off or on (as specified by
TS FAIL MODE) until this alarm is cleared. If the TS
CONTROL MODE
uses the EXTERNAL INPUT, a CONTROL TS FAILURE is self-clearing (i.e., is non-
latching).
3.8 Other Alarms
This Section defines the nontemperature-related alarming functions of the 920 controller: cur-
rent, ground fault, voltage and resistance. These parameters must be set up individually for both
Point A and Point B.
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