Emerson Process Management 53eA Manual De Usuario

9.

a.

Move the cursor to the desired alarm setup and press Enter (F4).

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.

Setpoint 

: 1.000 ppm

Proportional: 100.0%
Integral: 0 sec

Exit

Edit

Alarm 1 control

Alarm 1 setup

Alarm 2 control

Exit

Enter