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47LLC OPERATING MANUAL EM-9505-B Rev.4
11. sETTING ALARM OUTPUT
The unit compares the present value with the alarm setpoints, and provides an alarm output (relay contact or photo MOS-
FET relay). You can configure parameters as alarm conditions as shown in Tables 1 and 2. Figures 1 to 5 show alarm
examples using each parameter.
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TABLE 1: ALARM OUTPUT PARAMETERs
PARAMETER
FUNCTION
Alarm point
Dual alarm or quad alarm
Alarm setpoint
Setpoint value within the range of -19999 to 19999 for the display value
Trip action
High or low trip
Configuring typical L/H trip setting (Figure 1) or all trip points to high or low setting (Figure 2)
is available.
‘P’ indicator turns on when none of the other alarms is tripped.
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 3).
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 (Figure 4).
Coil at alarm
Alarm output logic, coil energized or de-energized at alarm (Figure 5).
Main display blinking at alarm
Main display blinking interval at alarm can be selected among 5 intervals (Table 2).
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TABLE 2: sETTING VALUEs
PARAMETER
DISPLAY
FUNCTION
DEFAULT VALUE
Alarm point
Dual alarm
Alarm output code 1, 3:
Quad alarm
Alarm output code 2:
Alarm setpoint
to
-19999 to 19999
LL alarm setpoint:
L alarm setpoint:
H alarm setpoint:
HH alarm setpoint:
Trip action
Lo trip
LL, L trip action:
Hi trip
HH, H trip action:
Deadband (hysteresis)
to
0001 – 9999
ON delay time
to
0 – 99 seconds
Coil at alarm
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 0.2 second intervals
Blinking in 0.1 second intervals