Pentair 920 Series Installation, Operating And Maintenance Instructions page 32

INDUSTRIAL HEAT TRACING SOLUTIONS
condition resulting from a forced on failure of the heating circuit should first be alarmed by the
SWITCH FAILURE ALARM. See section 3.8.18 on page 40 for more information.
3.7.7 LoW temperature sensor aLarm fILter tIme settInG (v3.11 and up)
purpose: The LOW TS ALARM FILTER will prevent LOW TS 1 and/or LOW TS 2 ALARMS from being
indicated until their corresponding alarm condition has existed for the duration of the LOW TS
ALARM FILTER time.
range: 0 to 999 Minutes
Procedure: Adjust the LOW TS ALARM FILTER time to the desired value. Note that either the LOW
TS 1 ALARM and/or the LOW TS 2 ALARM must be enabled in order to adjust the LOW TS ALARM
FILTER time.
Important:
• 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, then the alarm will not be
indicated again until the entire alarm filter time has expired.
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.
Important:
• 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
indicated 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 condi-tion 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).
Important:
• 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
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