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MODEL 54eA
5.7 CHANGING ALARM PARAMETERS (continued)
FIGURE 5-2. Low Alarm
Alarm 1 control
Alarm 1 setup
Alarm 2 control
Exit
Setpoint
: 1.000 ppm
Proportional: 100.0%
Integral: 0 sec
Exit
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9. Alarm setup for TPC alarms:
a. Move the cursor to the desired alarm setup and press Enter (F4).
Enter
b. Use the
eter. Press Edit (F4). Use the arrow keys to change the setting to
the desired value and press Save (F4) to store the value
Setpoint: Setpoint is the usually the value to which the process
is to be controlled. The alarm will not be on much when the
process is at the setpoint value.
Edit
Proportional: Proportional is the same as proportional band and
is the range over which control is being used. It is the opposite of
process gain. Smaller values provide tighter control.
Integral: Integral is the number of seconds over which deviations
from the setpoint are integrated to remove continuing offsets.
Smaller values provide higher response.
Derivative: Derivative is a form of control that resists all changes
in readings. Higher readings increase the derivative function. To
prevent process oscillation, use caution in setting the derivative
value.
Time period: Time period is the cycle time for TPC control. One
cycle consists of an energized (relay on) time and a deenergized
(relay off) time.
URV: URV is the deviation from the setpoint that results in the
alarm being on all the time.
LRV: LRV is the deviation from the setpoint that results in the
alarm being off all the time. The LRV should be set to 0.00.
FIGURE 5-3. High Alarm
and
keys to move the cursor to the desired param-
SECTION 5.0
SOFTWARE CONFIGURATION
35
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Troubleshooting
