ARI Armaturen Elektrischer Schubantrieb FR 1.2 DE - Handbuch (Seite 8)

P100001973 - 8 -
Operation
Initialisation and feedback signal
Spring return
Connection as a 2-point valve drive (24 V)
After a new start, or after a start following activation of the reset (terminal 21), up to 45 s of waiting
time will pass before the drive is available again. Depending on the type of connection (see the
wiring diagram), the device can be used as a continuous-action drive (0...10 V and/or 4...20 mA), a
2-point drive (open-closed) or a 3-point drive (open-stop-closed).
The run time of the drive can be set according to the specific requirements, using switches S1 and
S2. Switches S3 and S4 are used to configure the characteristic curve (equal percentage, linear or
quadratic).
The external hand crank allows you to adjust the position manually. When the hand crank is folded
out, the motor is switched off. After the hand crank is folded back, the spring function is active again
and the setpoint position is adopted again (without initialisation). If the hand crank is unfolded, the
drive stays in this position.
The drive initialises itself automatically, whether it is used in continuous-action, 2-point or 3-point
mode. As soon as voltage is applied to the drive for the first time and the waiting period has elapsed,
the drive moves to the lower limit stop on the valve, thus enabling automatic connection with the
valve spindle. Then it moves to the upper limit stop, and the value is recorded and saved with the
help of a path measurement system. The control signal and the feedback signal are adjusted to this
effective stroke. After an interruption to the voltage or a spring return action, no re-initialisation is
performed and the values are saved.
To re-initialise, the drive must be connected to the voltage. To trigger an initialisation, fold the hand
crank out and back in again twice within 4 seconds. Both the LEDs will then flash red.
During initialisation, the feedback signal is inactive, or it corresponds to a value of "0". Initialisation
uses the shortest run time. The re-initialisation is only valid once the entire procedure has been
completed. Folding the hand crank out again will interrupt the procedure.
If the valve drive detects a blockage, it will report this by setting the feedback signal to 0 V after
approx. 90 s. However, the drive will try to overcome the blockage during this time. If it is possible to
overcome the blockage, the normal control function is activated again and the feedback signal is
restored.
If the voltage supply fails or is switched off, or if a monitoring contact responds, the brushless DC
motor releases the gear and the drive is moved into the respective end position by the pre-tensioned
spring. As this happens, the control function of the drive is disabled for 45 s (both LEDs flash green)
so that the end position can be reached in every case. The reset speed is controlled with the help of
the motor so that there are no pressure surges in the line. The brushless DC motor has three
functions: as a magnet to hold the position, as a brake (by acting as a generator) and as a motor for
the control function. After a spring return function, the drive does not re-initialise itself.
This activation (OPEN/CLOSED) can take place via two cables. The voltage is applied to terminals
1 2a and 21. Applying the voltage (24 V) to terminal 2b causes the coupling rod to extend and closes
the valve. After this voltage has been switched off, the drive moves to the opposite end position and
opens the valve. The electronic motor switch-off responds in the end positions (valve limit stop, or
when maximum stroke is reached) or in case of overload (no limit switches).
The coding switch can be used to set the run times. The characteristic curve cannot be selected in
this case (resulting in the characteristic curve for the valve). The feedback signal is active as long as
the initialisation is performed and there is voltage present at terminal 21. Terminals 3i, 3u and 44
must not be connected.