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3.8.11 HIGH VOLTAGE ALARM FILTER TIME SETTING (V3.11 AND UP)
Purpose: The
HIGH VOLTAGE ALARM FILTER will prevent HIGH VOLTAGE ALARMS from being indi-
cated until a high voltage condition has existed for the duration of the
HIGH VOLTAGE ALARM FIL-
TER
time.
Range: 0 to 12 seconds
Procedure: Adjust the
HIGH VOLTAGE ALARM FILTER time to the desired value. The HIGH VOLTAGE
ALARM
must be enabled to adjust the HIGH VOLTAGE ALARM FILTER time. Also, the HIGH VOLTAGE
ALARM FILTER
is only available if VOLTAGE SOURCE is set to the Point being used.
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.
3.8.12 LOW RESISTANCE ALARM
Purpose: Alarms heater resistance levels that have decreased from the
NOMINAL RESISTANCE
setting by more than the selected amount.
Alarm Mask:
ENABLE or DISABLE
Range: 1 to 100% (deviation from NOMINAL RESISTANCE)
Procedure: Adjust the LOW RESISTANCE ALARM deviation to the desired value. The LOW RESIS-
TANCE ALARM
must be enabled in order to adjust the LOW RESISTANCE deviation.
Notes:
• This feature is not normally enabled. It can be used effectively to guard against accidental
paralleling of heating circuits. Be careful when using this alarm feature with heating cables
that exhibit a variable resistance with temperature. Low resistance alarming may not be prac-
tical when the load has an increasing resistance with temperature (such as self-regulating
cables).
• Use of the
LOW RESISTANCE ALARM assumes that the controller power is derived from the
same circuit as the tracing power (either by direct connection or through a step-down trans-
former). Disable this alarm if the controller is powered from a separate circuit.
•No
LOW RESISTANCE ALARMS will be generated if the measured voltage is below the LOW
VOLTAGE ALARM
setpoint, regardless of whether the LOW VOLTAGE ALARM is enabled. This
stops an alarm from being generated when the circuit power is turned off. If the
LOW VOLTAGE
ALARM
is disabled ensure that the LOW VOLTAGE setpoint is set to a relevant level otherwise
no
LOW RESISTANCE ALARMS will occur.
•
LOW RESISTANCE ALARMS will only be generated if the output switch is on.
3.8.13 LOW RESISTANCE ALARM FILTER TIME SETTING (V3.11 AND UP)
Purpose: The
LOW RESISTANCE ALARM FILTER will prevent LOW RESISTANCE ALARMS from being
indicated until a low resistance condition has existed for the duration of the
LOW RESISTANCE
ALARM FILTER
time.
Range: 0 to 12 seconds
Procedure: Adjust the LOW RESISTANCE ALARM FILTER time to the desired value. The LOW
RESISTANCE ALARM
must be enabled to adjust the LOW RESISTANCE 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.
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