Samson Series 420, Руководство пользователя

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14 EB 7500 EN
Design and principle of operation
Fig. 6: Type 3421 Compact Controller
1.1 Housing
1.2 Plug-in unit
1.3 Controller module
1.4 Connecting plate
2
Set point pointer (green)
3 Controlled variable pointer (red)
4 Control signal yA
5 Control signal yH
9 Manual adjuster for yH
10 Manual/automatic switchover
11 Set point adjuster
14 Selector switch (w
ext
/w
intern
)
5 Design and principle of oper-
ation
The pneumatic control system has a modular
design. As a result, the compact control
equipment can be combined with various
controller modules and additional modules
and adapted to a wide range of applica-
tions.
5.1 Type 3421 Compact Con -
troller
The Type 3421 Pneumatic Compact Control-
ler consists of the Type 3422 Manual Control
Station and the Type 3423 Controller Mod-
ule.
The manual control station consists mainly of
the housing (1.1) with connecting plate (1.4)
and the plug-in unit (1.2) to hold the control-
ler module (1.3). The plug-in unit has self-
seal push-on fittings, allowing the device to
also function as a control station when no
other components are used.
The controlled variable and set point pointers
have metal bellows measuring elements. The
controlled variable measuring element can
optionally be equipped with adjustable in-
ductive limit contacts or LEDs.
Three versions of the Type 3422 Manual
Control Station are available, which are
adapted to the control task. Depending on
the circuit version 1, 2 or 9, the device does
not have the set point adjuster (11), set point
pointer (2), or selector switch (14) for inter-
nal (w
int
) or external (w
ext
) reference variable.
All circuit versions have the ports R (feed-
back) and y (output pressure) connected in-
ternally to the connecting plate of the com-
pact controller.
In case
y and R are to be routed separately
out of the device, proceed as described in
section 7.1 by relocating the O-rings on the
connecting plate.
1.4
1.1
1.3 1.2
14 9
5
4
3
2
10
11