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10
Setpoints/Alarms
7. "SPC.6=0" compares the "SP 2" level to the UNFILTERED
measurements.
"SPC.6=1" compares "SP 2" to the FILTERED measurements.
8. "SPC.7=0" Enables both setpoints 1 and 2.
"SPC.7=1" Disables both setpoints 1 and 2.
9. "SPC.8=0" ENABLES the two front-panel LED indicators for setpoints 1
and 2 when you have chosen "SPC.7=0".
"SPC.8=1" DISABLES the two front-panel LED indicators for setpoints 1
and 2. (use with caution; recommended only when other external over-
range indicators are present).
10. Press the 'MENU' button to store your selections and advance to
"AL CNF" (Alarm Configuration).
10.4 DEVIATION FUNCTION FOR ALARMS
Deviation functions apply to Alarms 1 and 2 (Setpoints 3 and 4) and act as
buffer zones to control setpoint action. The Alarm 1 deviation is the sum of
the Alarm 1 value plus the Setpoint 1 value; the Alarm 2 deviation is the
Alarm 2 value plus the Setpoint 2 value. The four types of deviation functions
are Process (no deviation), High, Low, and Deadband. The following
illustrate the ways in which the deviation function alters the alarm response.
100%
90%
SIGNAL
LEVEL
SP1+SP3 = 250
SP1+SP3–HYS = 240
SP3 = 100
SIGNAL
LEVEL
Figure 10-4. High Deviation for both Active Above and Active Below
10-4
OFF
ON
OFF
ACTIVE ABOVE
Figure 10-3. Process Deviation
OFF
ON
ACTIVE ABOVE
110%
100%
ON
SIGNAL
ON
LEVEL
SP1+SP3+HYS = 260
SP1+SP3 = 250
OFF
SIGNAL
LEVEL
OFF
ON
ACTIVE BELOW
ON
OFF
ON
ACTIVE BELOW
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