Azbil Corporation
18
Model
KFPA
,
KFTA
- Field Mount type Pressure Indicating Controllers
4-3: Manual operation
When a manual loader is provided, perform the manual operation according to the
following procedure to conform the stability of process.
(1) Set the AUTO/MAN transfer switch in the M position. Adjust the manual loader
(regulator) output so that the required process value is obtained.
4-4: Automatic operation
For a control system for which no set point value is determined, automatic operation is
generally started in the procedure mentioned blow.
(1) Set the control sections as follows:
Proportional band (P): Maximum (proportional band setting dial 500%)
Reset time (I):
Maximum (reset dial 3.0 minutes)
Rate time (D):
Minimum (rate dial 0.05 minutes)
(2) When the manual loader unit is provided, operate the pressure regulator so that the
desired output value can be obtained with the AUTO/MAN switch set in the M
position.
(3) By turning the setting knob, set the set point pointer to the desired value. When the
setting knob outside the case is provided, setting can be done by turning the knob,
pressing it toward the door.
(4) If the check button is pushed with the AUTO/MAN switch set in the manual (M)
position, the output pressure gauge indicates the controller output. If the check
button is pushed with the switch set in the automatic (A) position, the pressure
gauge indicates the pressure regulator output.
For switching from the manual operation to the automatic operation when the
manual loader is provided, make equal the pressure regulator output and the
controller output in the manual (M) position, observing the output pressure gauge.
When the pointer of the output pressure gauge has become stable even if the check
button is pushed, change the transfer switch lever from manual (M) position to
auto (A) position. (Shift the lever quickly and completely until it comes to the end
position.)
(5) In auto operation, set P.I.D. to suit the process characteristics.
(6) For switching to manual operation, follow in the reverse order the procedure (4)
Figure 19
Lever
(position "M")
Manual regulator
valve
Output air pressure
gauge
Set point index (green)
PV pointer (Red)
Push and turn
