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47DAC OPERATING MANUAL EM-9518-B Rev.4
Figure 4: All trip points set to high setting (normal setting)
Figure 5: Deadband (hysteresis)
Display value
L alarm output (hi)
H alarm setpoint
L alarm setpoint
HH alarm setpoint
LL alarm setpoint
HH alarm output (hi)
H alarm output (hi)
LL alarm output (hi)
‘HH’ indicator
‘P’ indicator
‘L’ indicator
‘H’ indicator
‘LL’ indicator
Display value
Closeup
Alarm setpoint (hi)
Display value
Deadband works
in the direction of
decreasing display
value.
Deadband
Alarm output
With deadband
Without deadband
(setting value: 0000)
Preventing chattering
Low or high trip action can be set for each alarm output.
‘LL’, ‘L’, ‘H’ and ‘HH’ indicators are fixed for each setpoint.
Therefore, even in case setting LL alarm output to high
trip action, for example, ‘LL’ indicator turns on at alarm.
Figure 6: ON delay time
Figure 7: OFF delay time
Display value
Alarm setpoint (hi)
ON delay time
ON delay time
(1)
(2)
Alarm output
Alarm output is not provided
with a sudden change.
Display value
Alarm setpoint (hi)
OFF delay time
OFF delay time
(1)
(2)
Alarm output
Alarm output is not canceled
with a sudden change.
(1) The display value once exceeds the alarm setpoint
but becomes below it during ON delay time period.
Therefore alarm output is not provided.
(2) The display value exceeds the setpoint and stays
over the ON delay time period. Therefore alarm
output is provided.
(1) The display value once falls below the alarm setpoint
but exceeds it during OFF delay time period. There-
fore alarm output is not canceled.
(2) The display value falls below the setpoint and stays
over the OFF delay time period. Therefore alarm
output is canceled.
