Red Lion PAX2C - Manual (Page 38)

38
ALARM VALUE
-1999 to 9999
Enter desired alarm value. Alarm values can also be entered when
the alarm is programmed as dEnt, PEnt or HEnt. The decimal point
position is determined by the Decimal Resolution setting in the
Analog Input Parameter Menu.
BAND/DEVIATION VALUE
-1999 to 9999
This parameter is only available in band and deviation alarm
actions. Enter desired alarm band or deviation value. When the Alarm
Action is programmed for Band, this value can only be a positive
value.
HYSTERESIS VALUE
1 to 9999
Enter desired hysteresis value. See Alarm Figures for visual
indication or representation of how alarm actions (balanced and
unbalanced) are affected by the hysteresis. When the alarm is a
control output, usually balanced hysteresis is used. For alarm
applications, usually unbalanced hysteresis is used. For unbalanced
hysteresis modes, the hysteresis functions on the low side for high acting alarms
and functions on the high side for low acting alarms. Note: Hysteresis eliminates
output chatter at the switch point, while on/off time delay can be used to prevent
false triggering during process transient events.
ON TIME DELAY
0 to 9999 seconds
Enter the time value in seconds that the alarm is delayed from
turning on after the trigger point is reached. A value of 0.0 allows the
controller to update the alarm status per the response time listed in
the Specifications. When the output logic is rEv, this becomes off time
delay. Any time accumulated at power-off resets during power-up.
OFF TIME DELAY
0 to 9999 seconds
Enter the time value in seconds that the alarm is delayed from
turning off after the trigger point is reached. A value of 0.0 allows the
controller to update the alarm status per the response time listed in
the Specifications. When the output logic is rEv, this becomes on time
delay. Any time accumulated at power-off resets during power-up.
ALARM LOGIC
nor rEv
Enter the logic of the alarm. The nor logic leaves the alarm
operation as normal. The rEv logic reverses the alarm logic. In rEv,
the alarm states in the Alarm Figures are reversed.
RESET ACTION
Auto LtC1 LtC2
Enter the reset action of the alarm.
Auto = Automatic action; This action allows the alarm to
automatically reset off at the trigger points per the Alarm
Action shown in Alarm Figures. The “on” alarm may be
manually reset (off) immediately by a front panel function
key or user input. The alarm remains reset off until the
trigger point is crossed again.
LtC1 = Latch with immediate reset action; This action latches the
alarm on at the trigger point per the Alarm Action shown in
Alarm Figures. Latch means that the alarm can only be
turned off by front panel function key or user input manual
reset, serial reset command or controller power cycle. When
the user input or function key is activated (momentary or
maintained), the corresponding “on” alarm is reset
immediately and remains off until the trigger point is
crossed again. Any alarms that are latched at power down
will be reset.
LtC2 = Latch with delay reset action; This action latches the alarm
on at the trigger point per the Alarm Action shown in Alarm
Figures. Latch means that the alarm can only be turned off
by front panel function key or user input manual reset,
serial reset command or controller power cycle. When the
user input or function key is activated (momentary or
maintained), the controller delays the event until the
corresponding “on” alarm crosses the trigger off point. Any
alarms that are latched at power down will be reset.
ALARM STANDBY OPERATION
NO YES
When YES, the alarm is disabled (after a power up) until the trigger
point is crossed. After the alarm trigger is reached, the alarm operates
normally per the Alarm Action and Reset Mode.
The following programming step is only available when Input Type in the
Input Menu is set for a temperature input (TC/RTD).
BURN-OUT ACTION
OFF ON
Enter the probe burn-out action. In the event of a temperature
probe failure (TC open; RTD open or short), the alarm output can be
programmed to be on or off.
ALr
An
0.0
°F
bdEU
dn
0.0
°F
HYSt
An
0.2
°F
tON
An
0.0
SEC
tOFF
An
0.0
SEC
LGIC
An
nor
rSEt
An
Auto
ALARM
STATE
OFF ON
Hys
AL
OFF ON OFF
OFF ON OFF ON OFF
OFF ON OFF ON OFF
MANUAL
RESET
AL - Hys
( Auto)
(LtC1)
(LtC2)
м
н
о
Alarm Reset Actions
StbY
An
N0
IFLt
An
OFF