Einbau- und Betriebsanleitung
Installation and Operating instructions
Instructions de montage et de service
3581-8010
07/2009
4
Description of Function
The controller is working in 4 different Functions.
4.1
Manual operation
Press key the LED is lighting manual operation is switched on. Driving the valve only with the keys on the RE3581
possible. Other input signals are switched off.
4.2
Automatic operation
Press key the LED is not lighting automatic operation is switched on. Driving the valve only with the input signals on the
RE3581 possible.
4.3
Positioner operation
At terminal 68 and 69 connect the output signal of the master controller, LED
4..20mA
lighting.
The feedback of the stroke is also a 4..20mA signal (Terminal 65 and 66). It is galvanic isolated, so a 24V DC power supply is needed.
4.4
Safety position when interrupted input signal
If the input signal (4..20mA) breaks you can appear a safety position with connecting the power supply at Z1 to Z3:
safety position closed:
connect at Z1 and Z3 230V AC optional 24V DC
safety position opened :
connect at Z1 and Z2 230V AC optional 24V DC
Z1 to Z3 not connected:
actuator do nothing when signal is broken (only at 4..20mA and 2..10V input signal).
If the input signal gets lower than 2mA or 1V the controller drives in safety position.
5
Setting in motion
DAC is a microcontroller system. Its job is to monitor the result of the commands of the controller. If any error occurs, which is recognised by
measurement of the stroke, an error indication is displayed. An initialisation for the first time is need to get the RE 3581 in operation. The
stroke limits 0% and 100% are recognised without limit switches. The RE 3581 is generating a feedback signal (4..20mA) for the stroke.
Manual operation is possible during power supply on.
5.1
Galvanic isolated feedback
The stroke of the valve is automatically recognised and generated to a galvanic isolated feedback signal (4...20mA). The feedback signal
needs a power supply of 12-24 V DC. (see cap.2.1 "Wiring diagram")
5.2
Intelligent limit switches
When the actuator reaches the limits (stroke 0% or 100%) RE 3581 switches off. After reaching the close position, it waits for 5 secs before
driving the actuator to "closing tight". The first step in the other direction is lengthened, until the actuator is in controlling position.
5.3
Charakteristic adaption
An oscillating actuator is stabilised by correcting the command attributes. The profile is learned during operation and saved permanently.
For adapting purposes, DAC needs
1. to recognise in which stroke range the control loop is unstable
2. to stabilise the control loop by correcting the command attributes.
Picture 1: Steps of the controller
Picture 2: Actuator without DAC6
