12
EB 7500 EN
Start-up and settings
If a P/PI controller is switched to P action,
completely open the Tn restrictor to ensure
the operating point adjuster can take effect
without delay.
Version with set-point-dependent operating
point
This version does not need to be adjusted
since the operating point automatically fol-
lows the set point w.
4.2 Bumpless automatic/
manual mode changeover
The bumpless switchover ensures that no
pressure surges can reach the valve when
the manual/automatic switch (10) is activat-
ed as follows:
Changeover from automatic to manual
Use the adjuster (9) to adjust the manual out-
put yH until the pointers (4 and 5) in the bot-
tom display meet. Change the switch over to
manual.
Changeover from manual to automatic
If the system is to be controlled manually to
the required value, the automatic output yA
must be adjusted at the set point adjuster
(11) to match the manual output yH.
The switch (10) can only be set to automatic
after the pointers (4 and 5) in the bottom dis-
play meet.
4.3 Readjusting the controller
zero point
If deviations arise between the controlled
variable and set point during operation, the
zero point can be readjusted by turning the
zero adjuster (8 in Fig. 1) until the controlled
variable and set point on the front display
are the same again.
4.4 Additional modules
The Type 3424 Additional Module is no lon-
ger available.
4.4.1
Type 3424-4 Manual/
automatic Transfer
Switchover is performed automatically by
activation of the manual/automatic switch
(10, Fig. 3). See
u
T 7523.
4.4.2
Type 3424-5 Control
Mode Changeover
u
T 7523
Adjusting the direction of action
Set the direction of action at the turnboard of
the control mode changeover device to
match the direction of action of turnboard
A
of the controller module. To proceed, unfas-
ten the screw on the turnboard and turn the
board as follows:
Note
Note
