DigiTrace 920 Series Heat Trace Controller - Pentair Thermal ...

condition resulting from a forced on failure of the heating circuit should first be alarmed by theSWITCH 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 beingindicated until their corresponding alarm condition has existed for the duration of the LOW TSALARM FILTER time.Range: 0 to 999 MinutesProcedure: Adjust the LOW TS ALARM FILTER time to the desired value. Note that either the LOWTS 1 ALARM and/or the LOW TS 2 ALARM must be enabled in order to adjust the LOW TS ALARMFILTER time.IMPORTANT:• If an alarm condition appears and then disappears before the alarm filter time has expired, thefilter timer is reset and the alarm condition must exist again for the entire alarm filter timebefore the corresponding alarm will be indicated.• If the user resets an alarm while the alarm condition is still exists, then the alarm will not beindicated 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 frombeing indicated until their corresponding alarm condition has existed for the duration of the HIGHTS ALARM FILTER time.Range: 0 to 999 minutesProcedure: Adjust the HIGH TS ALARM FILTER time to the desired value. Note that either theHIGH TS 1 ALARM and/or the HIGH TS 2 ALARM must be enabled in order to adjust the HIGH TSALARM FILTER time.IMPORTANT:• If an alarm condition appears and then disappears before the alarm filter time has expired, thefilter timer is reset and the alarm condition must exist again for the entire alarm filter timebefore the corresponding alarm will be indicated.• If the user resets an alarm while the alarm condition is still exists, the alarm will not beindicated 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 LIMITCUTOUT feature is enabled.3.7.9 LATCH TEMPERATURE SENSOR ALARMS SETTINGPurpose: 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 ofsuch 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 theprocess, it may be appropriate to configure the HTC for nonlatching temperature alarms toavoid nuisance alarms. If it is important to be aware of any temperature alarm conditions thatmay 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 ALARMPurpose: CONTROL TS FAILURE ALARM indicates a failure of the temperature sensor designatedas the control sensor.One of eleven TS CONTROL MODES may be selected. These modes determine which TS INPUTand/or EXT. INPUT is designated to provide the control temperature. See section 3.5.12 on page 24for a full description of the temperature sensor control designations.Alarm Mask: ENABLE or DISABLETHERMAL MANAGEMENT SOLUTIONS EN-DigiTrace920series-IM-H56874 04/13 32 / 82