MODEL 54eA | SECTION 5.0 |
| SOFTWARE CONFIGURATION |
5.7 CHANGING ALARM PARAMETERS (continued)
FIGURE |
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9.Alarm setup for TPC alarms:
a. Move the cursor to the desired alarm setup and press Enter (F4).
Alarm 1 control
Alarm 1 setup
Alarm 2 control
ExitEnter
Setpoint : 1.000 ppm
Proportional: 100.0%
Integral: 0 sec
ExitEdit
b.Use the é and ê keys to move the cursor to the desired param- 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.
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.
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