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Alarm Delays Section 4-10
4-10 Alarm Delays
4-10-1 Alarm Delays
• Delays can be set for the alarm outputs. ON and OFF delays can be set
separately for alarms 1, 2, and 3. The ON and OFF delays for alarm 1
function only for the alarm function. If the alarm output 1 is set to be out-
put as an OR with other alarm functions (i.e., the heater burnout alarm,
HS alarm, or input error output alarm), the delays will not function for the
other alarms. The ON and OFF delays for alarms 1, 2, and 3 also apply to
the individual ALM1, ALM2, and ALM3 indicators and to communications
status. The alarm ON delays will also function when power is turned ON
or when moving from initial setting level to operation level (i.e., to software
resets). All outputs will turn OFF and the OFF delays will not function
when moving to the initial setting level or when an alarm is output for a
heater burnout error.
Operation of Alarm ON and OFF Delays (for an Upper-limit Alarm)
• The alarm will not turn ON if the time that the alarm is ON is equal to or
less than the ON delay set time. Also, the alarm will not turn OFF if the
time that the alarm is OFF is equal to or less than the OFF delay set time.
• If an alarm turns OFF and then back ON during the ON delay time, the
time will be remeasured from the last time the alarm turns ON. Also, if an
alarm turns ON and then back OFF during the OFF delay time, the time
will be remeasured from the last time the alarm turns OFF.
Parameters Related to Alarm Delays
PV
Alarm setting
Alarm hysteresis
Alarm status
ON delay
set time
ON delay set time
OFF delay
set time
Alarm Latch = OFF
Alarm will not turn ON.
Parameter name Symbol Set (monitor) values
Alarm 1 ON delay a1on 0 to 999 (s)
Alarm 2 ON delay a2on 0 to 999 (s)
Alarm 3 ON delay a3on 0 to 999 (s)
Alarm 1 OFF delay a1of 0 to 999 (s)
Alarm 2 OFF delay a2of 0 to 999 (s)
Alarm 3 OFF delay a3of 0 to 999 (s)
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