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Digital controller module SD7
Digital controller modul

CONTROLLER MODULE SD7
Command value scaling Controller mode «Pressure/flow valve control (1-sol)»
The command value can be applied via the fieldbus or as a voltage, Control of a 1-solenoid pressure relief, pressure reducing, throttle
P
current, digital, frequency or PWM signal. The input used can be or flow control valve in closed control circuit (with feedback value
P
selected for each command value. The scaling is carried out via signal). Only one solenoid can be controlled with it (corresponds to
the «Interface» and «Reference» parameters. Furthermore, each the solenoid driver 1).
SD7
P
w
Xi
command value can be monitored for cable break (except HART, P
x
P
w
SD7
voltage and digital signal). For every command value, a dead band Q P
Xi
x can also be set. Optionally one can operate with two command Q
t
Xi
values. The characteristic of these command values can be adjusted. P Xi SD7 w Q Xi SD7 w
t x Q
Xi Profiles/Fixed command values (Enhanced controller only) Q Xi SD7 w P SD7 w
SD7
There are 7 fixed command values available, which can be selected Xi
t
Xi
via 3 digital inputs. Optionally, travel profiles can also be used. The x Q Xi SD7 w Q
SD7 controller module is able to store and to travel whole travel
w
SD7 profiles, which have been previously generated by the user in the
SD7
profile generator. A travel profile consists of the following data: t
• Target position (target or end position of the sequence) Xi Q SD7 w
w • Speed (of the travel) w P Xi
• Acceleration (to reach the speed) Controller mode «Pressure control (2-sol)»
V
Xi
• Deceleration (starting from the speed) P Control of two 1 solenoid throttle valves in closed control circuit (with
• Stop time (after reaching the end position of the sequence) Xi feedback value signal) as pressure control. The one throttle valve
SD7
P
w
P
P
• Setting of a digital output when reaching the end position serves as a loading valve and the other as an unloading valve. The
V of the sequence V Xi loading valve corresponds to the solenoid driver 1, the unloading
SD7
Xi • Adjust whether the command value or the feedback value for the valve corresponds to the solenoid driver 2.
P
P
SD7
end of the sequence is to be queried w Xi
Xi
w w P w P P
Command value generator Xi
In the open-loop controller modes, there are two linear ramps for up SD7
SD7
SD7
and down per solenoid output are available, which can be adjusted
P
SD7 separately. In the closed-loop controller modes, there is a positive and w SD7 P
a negative travel speed available. Xi P
w P Xi w
w
HOLD command value (option fieldbus only) P V SD7
Xi
If via fieldbus the device is put into the «HOLD» state, the respective Xi P
t
Xi
P
command value is activated. SD7 Xi
SD7 w
Feedback value scaling Xi w SD7 w P
The feedback value can be applied via HART or as voltage, current, t Xi w
w frequency or PWM signal. For the feedback value, the input used SD7
SD7
w
Xi can be selected. The scaling is carried out via the «Interface» and
t
«Reference» parameters. In addition, the feedback value can be SD7 SD7
Xi
monitored for cable break (except HART and voltage signal). Controller mode «Axis position controlled»
SD7 Control of a spool valve in open control circuit (without feedback
w
Manual operation (Enhanced controller only) value signal). The number of solenoids controlled depends on the w P Xi
SD7
The commands Enable, Forward, Reverse and Fast speed are selected mode of operation.
available. This makes it possible to move the cylinders through a
superimposed control without specifying a command value. Controller mode «Axis position controlled (2-sol)»
w Control of a 2-solenoid spool valve in closed control circuit (with P
Window feedback value signal). Two solenoids can be controlled with it. SD7
A target, tracking error and solenoid stop window is available. The
threshold and delay time can be set for each window.
w
Controller
The SD7 controller module has a controller circuit. This is built up as w
PID controller. The following controller modes can be selected: Xi t
Xi
Controller mode «Pressure/flow valve control»
Control of a pressure relief, pressure reducing, throttle or flow control SD7
valve in open control circuit (without feedback value signal). The
number of solenoids controlled depends on the selected operating SD7
mode of operation.
w
Wandfluh AG Tel. +41 33 672 72 72 sales@wandfluh.com Illustrations not obligatory Data sheet no.
Postfach Fax +41 33 672 72 12 www.wandfluh.com Data subject to change 1.13-106E 5/11
CH-3714 Frutigen Edition 23 02
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