S+S Regeltechnik PREMASGARD 722 Série Notice D'instruction page 13

G
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PREMASGARD
Automatic Output Switching
Patented analogue interface for automated output switching
(Patent no. DE 10 2015 015 941 B4)
Switching on the device will analyse the network connected to the outputs
and set the relevant output type U or I.
If one of the outputs is detected as a current output, both outputs are
configured as output type I. Using it as a mix of current and voltage
output is not possible.
The status LED signals the detected output type.
Network resistance > 15 kiloohms => U output 0–10 V
Network resistance < 450 ohms => I output 4...20 mA
Manually adjusting the offset:
A potentiometer on the PCB is used to adjust the offset. When the system
is delivered, the potentiometer is in centre position and lacquer-sealed.
The setting range is approx. ± 10% of the pressure range.
You can use a different reference point other than the zero point.
Automated zero point adjustment:
1. To adjust the zero point, operate the device for at least 60 minutes.
2. Connect the pressure inputs P(+) and P(-) with a hose (pressure
difference = 0)
3. To set the zero point, keep the AUTO Z
push-button pressed for approx. 10 seconds.
The status LED on the PCB blinks in red to signal a request for matching.
Following the countdown, the currently measured value is saved as an offset
value and cannot be lost even at zero voltage.
The status LED acknowledges correct matching by switching to the
output display (green or orange) and/or the display (optional) switches from
"Auto 0" to "Prog 0".
Please note:
Releasing the push-button during countdown (counter >0)
will cancel the zero point adjustment!
Shown on the display:
The actual pressure is shown alternately (approx. every 6 seconds)
depending on the channel in the first display line.
The second line shows the measurand's unit.
The bottom left image area shows the ID of the displayed channel
(channel 1 and/or 2).
722x
Status-LED
The status LED on the PCB shows
the current operating mode:
green ..... blinking .......... switching on the device
green ..... continuous light U output
orange .... continuous light I output
red ......... blinking .......... AUTO Zero request
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0–10 V
4...20 mA