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47DAC OPERATING MANUAL EM-9518-B Rev.4
9. BASIC ALARM SETTING
The alarm output configuration includes “basic setting” to configure basic parameters such like alarm output pattern, alarm
setpoints, trip action, ON and OFF delay time and coil at alarm, “bank” to save max. 8 sets of setpoints to switch as neces-
sary, and “advanced setting” to configure the advanced alarm operation. This section describes the “basic setting”. You can
configure parameters as alarm conditions as shown in Tables 1 and 2. Figures 2 to 9 show alarm examples using each
parameter.
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TABLE 1: ALARM OUTPUT PARAMETERS
PARAMETER
FUNCTION
Alarm output pattern
Normal or zone pattern is selectable (Figure 2 & 3). In the normal setting, alarm trips accord-
ing to the setpoint and the trip action (direction) setting. In the zone setting, alarm trips and
resets between each setpoint.
Alarm setpoint
Setpoint value within the range of -20000 to 100000 for the display value.
Trip action
High or low trip is selectable with the alarm output pattern set to “normal”. Configuring typical
L/H trip setting or all trip points to high or low setting (Figure 4) is available.
With the alarm output pattern set to “zone”, the trip action setting is disregarded.
Deadband (hysteresis)
Once a high (low) trip alarm is ON, the alarm stays ON until the data becomes lower (higher)
than the dead band value from the setpoint, which prevents the alarm output from chattering
when the display value fluctuates slightly near the setpoint (Figure 5).
Deadband works in the direction of increasing the display value for low trip and in the direction
of decreasing it for high.
ON delay time
Alarm output is provided when the display value exceeds the setpoint and stayed for the
specified time duration, which prevents the alarm output from being provided by a sudden
change such like external disturbance and starting current (Figure 6).
OFF delay time
Alarm output is canceled when the display value returns to the value to cancel the alarm and
stayed for the specified time duration, which prevents the alarm output from being canceled by
a rapid or sudden change such like external disturbance (Figure 7).
One-shot output
Alarm outputs can be provided as one-shot pulses (Figure 8).
Coil at alarm
Alarm output logic, coil energized or de-energized at alarm (Figure 9).
Main display blinking at alarm
Main display blinking interval at alarm can be selected among 4 intervals (Table 2).
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TABLE 2: SETTING VALUES
PARAMETER
MAIN DISPLAY
FUNCTION
DEFAULT VALUE
Alarm output pattern
Normal
Zone
Alarm setpoint
to
-20000 to 100000
Refer to 9.2.1 ALARM SETPOINT LIST for details.
Trip action
*
1
Lo trip
LL, L trip action:
Hi trip
HH, H trip action:
Deadband (hysteresis)
*
1
to
0000 – 9999
ON delay time
*
1,
*
2
to
0.0 – 99.9 seconds
OFF delay time
*
1,
*
2
to
0.0 – 99.9 seconds
One-shot output
*
1,
*
2
to
0000 (normal contact output),
0.1 – 999.9 seconds
Coil at alarm
*
1,
*
2
Coil energized at alarm
Coil de-energized at alarm
Main display blinking at
alarm
No blinking
Blinking in 1.0 second intervals
Blinking in 0.5 second intervals
Blinking in 0.3 second intervals
*
1 Selectable only at alarm setting lockout level ‘LV0’ (“completely unlock Alarm Setting Mode”).
*
2 Configurable for the P status.
