Control Target; Servo Control 1/Servo Control 2; Changing To Servo Control 1 Or Servo Control 2 - FujiFilm PXG4 Operation Manuals

Control Target

This controller has three valve control functions.
Select the best function for the current application.
● Valve Control Functions
Servo control 1
( Srv1 )
Servo control 2
( Srv2 )
Position feedback
(PFB) control
( pfb )

Servo Control 1/Servo Control 2

Adjusts and controls the motorized valve opening through
[OPEN], [CLOSE] connection points.
In manual mode, press the key to switch between [OPEN]
and [CLOSE].
Servo control 1 and servo control 2 have the following differences.
Chapter
Servo Control 1: No valve opening display
•
9
Servo Control 2: Has valve opening display
•
Neither control can be used to control the valve opening itself.
valve motor
(servo 1)
motorized valve
• Servo control 1 can control the motorized valve even without a
Point
valve opening signal from the motorized valve. (The motorized
valve opening is estimated from a calculation of the valve
stroke time.)
• Servo control 2 adds the valve opening signal display function
to servo control 1. Valve position display can be used to
automatically or manually adjust zero/span.
Controls the motorized valve opening
through [OPEN], [CLOSE] connection
points.
Controls the motorized valve opening
through [OPEN], [CLOSE] connection
points. The opening of the valve can be
displayed by reading the open position
signal from the motorized valve, but it
cannot be used in control output
calculations.
Inserts controls by adding the opening
signal from the motorized valve to the
control calculation results. Controls the
motorized valve opening through [OPEN],
[CLOSE] connection points.
This control can be used when there are
opening signals coming from the motorized
valve.
measured value input
OPEN connection output
(temperature)
CLOSE connection output
valve opening
(servo 2/PFB)
boiler

Changing to Servo Control 1 or Servo Control 2

Press and hold the
1
mode channel menu ("o o o o P P P P E E E E C C C C h h h h 1 1 1 1 "), then use the
keys to display SYS ("S S S S Y Y Y Y S S S S C C C C h h h h 7 7 7 7 ").
Refer to
See p. 93 in this chapter for information on how to display
the channel menu.
Press and hold the
2
keys to display CTrL ("C C C C T T T T r r r r L L L L ").
Press the
3
select Srv1 ("S S S S r r r r v v v v 1 1 1 1 ") when the bottom part of the
display begins to blink.
This chooses "Servo Control 1".
Press the
4
Press the
5
PV/SV display.
• Adjustments must be made to display the valve opening.
Point
• See "Position feedback (PFB) control" (p. 108, 128).
• An interlock function is built in. (except for PXG4)
Chattering may occur if the dead band ("PGAP") in the PFB
Caution
menu ("PFB Ch10") is set too small.
– 108 –
key to display the setup
key then use the
key, then use the
key to confirm the setting.
key to return to the operation mode
keys to