Azbil KFDB, User Manual

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15
Chapter 3. OPERATION METHOD
This section covers the operation method of the controller. For the detector which is used in
conjunction with the controller, refer to the operator’s manual of the detector itself.
3-1. Preparation
Check the air piping for that they are correctly connected and there is no leak.
3-2. Instrument Without Manual Loader
(1) Select a type (direct or reverse) of control action to suit the process and set the controller
units as follows:
Proportional band (P): Maximum (PROP BAND dial at 500 %)
Integral time (I): Maximum (RESET dial at 30 minutes)
Derivative time (D): Minimum (RATE dial at 0.05 minutes)
(2) Set the SP pointer at the desired point by means of the SP (setpoint) knob. When the
SP knob is provided on the door front, the setpoint can be varied by rotating the knob
keeping it pressed against the door. When in the cascade (remote) mode, the setpoint can
be varied by varying the external setpoint pressure signal.
(3) Feed the air supply. Set the PID actions to suit the process to be controlled.
3-3. Instrument With Manual Loader
3-3-1. Manual Operation
First, stabilize the process by manual operation. Set the A-M Selector lever to the M position
and adjust the pressure regulator so that the output pressure becomes the desired process
value.
3-3-2. Automatic Operation
For automatic operation in general, proceed as follows:
(1) Select a type (direct or reverse) of control action to suit the process and set the controller
units as follows:
Proportional band (P): Maximum (FROB BAND dial at 500 %)
Integral time (I): Maximum (RESET dial at 30 minutes)
Derivative time (D): Minimum (RATE dial at 0.05 minutes)
(2) Feed the air supply.
(3) Set the A-M transfer lever to the M position and adjust the pressure regulator so that the
output pressure becomes the desired process value.
(4) Set the SP pointer at the desired point by means of the SP (setpoint) knob. When the
SP knob is provided on the door front, the setpoint can be varied by rotating the knob
keeping it pressed against the door. When in the cascade (remote) mode, the setpoint can
be varied by varying the external setpoint pressure signal.
(5) Change the A-M transfer switch from the M position to the A position.