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RE 30134/06.12 VT-VACAP-500-2X/V0/...
Functional presentation
Function and structure of the p/Q controller card are shown
as block diagram (see page 3).
Pressure command value: It is specified by the user in the
form of voltage (0...10 V; b12/b14 and/or z10/z12). You can
do so by means of a potentiometer which can be supplied
by the card (z32/b8).
Actual pressure value: It is optionally recorded by pressure
sensors with voltage interface (1...6 V, 0...10 V) or current
interface (4...20 mA) (which can be switched).
The actual pressure value can be tapped as monitor signal
at z16 and/or z18. The command value is compared to the
actual value. The variation and the differentiated actual val-
ue act on a PID controller. The controller output signal acts
on the limiter circuit which influences the position command
value. If the actual pressure value is smaller than the pres-
sure command value, the controller signal is larger than the
specified position command value. It is thus not influenced
by the limiter; there is simple flow control of the valve.
Special function "channel selection" of the "2-channel control card"
This special function can be used in all cases in which two
actual pressure values have to act on one control distance
via their two independent controllers. An external mode
signal (z30/6...40 V =) is used to select basic or daughter
DIL 0
Mode signal z30
ON
H
ON
L
OFF
X
X– without influence
Principle of the channel selection
Mode signal
z30
If the pressure command value is reached, the limiter takes
effect according to the actual pressure value so that the in-
put signal for the valve position control is changed so that
p
command
Controller characteristic: The PID controller and the
derivative element can be roughly set by means of DIL
switches (printed circuit board) and finely by means of front
plate switches.
Controller display: The controller function is displayed by
means of LED and can be used for switching purposes via
an acknowledgement output.
Line break: Simultaneous flashing of the two yellow LEDs
and the switching of output b30 and/or b32 signalizes
a pressure sensor line break.
Controller shut-off: The controller can be shut off by
means of an external signal (6...40 V =).
Channel selection: Is only possible for the 2-channel card.
Detailed explanation (see below).
p/Q control signal on the control distance. The DIL switch 0
must be ON; otherwise, this special function is blocked. The
control signal of one channel must be inverted (DIL 5).
Basic card I
Daughter card II
OFF
ON – out I (b4/b2)
ON – out I (b4/b2)
OFF
ON – out I (b4/b2)
ON – out II(b6/b8)
DIL0
1
p/Q output basic card
Hydraulics Bosch Rexroth AG
– p
= 0 is maintained.
actual
DIL 5 I
ON
ON
X
p/Q output daughter card
No
p/Q output
Nc
7/12
DIL 5 II
OFF
OFF
X
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