DURAG D-R 290, Operating Manual

Page: 94 / 202

5 | Installation
94 D-R 290
Setting path:
> Specific parameters > D-R 290 configuration > Purge air sensor 1 present and
> Specific parameters > D-R 290 configuration > fail-safe shutter 1 present
or
> Specific parameters > D-R 290 configuration > Purge air sensor 2 present and
> Specific parameters > D-R 290 configuration > fail-safe shutter 2 present
Without this message, the shutter remains closed and cannot be opened by the
controller.
"Supercaps" are used for reliable closure of the shutter when the power fails. They are
located on the main printed circuit board of the control electronics (D‑SK AE, on the
back of the printed circuit board no. 30).
The supercaps are charged automatically at commissioning and after every power
supply failure. The charging procedure lasts max. 2 ½ min. The fully charged status of
the supercaps is indicated by the "Supercap check LED“ (Fig. on the left - L5) on the
front panel.
The fail-safe shutter will open only if the supercaps are fully charged!
The housing must be opened to set the switching points and the Hysteresis [
}
195] :
1. Use a screwdriver to turn the twist lock catch on the right side of the housing anti­
clockwise.
2. Then open the assembly frame with the transparent cover which swings open to
the left.
The setting elements are now accessible.
3. Set the
"Air flow"" potentiometer (P1)and the“Hysteresis“ potentiometer (P2) to the
minimum (turn the potentiometers fully clockwise).
✓ Once the mains power is applied the device is ready for operation. The yellow
LED (Fig. on the left - L1)
“Stand by“ and the red LED (Fig. on the left - L4)
“"Close shutter" light up.
4. With the purge air unit running, slowly turn the potentiometer (P1)
"Air flow“ to­
wards the maximum (turn the potentiometer anti-clockwise), until the green LED
(Fig. on the left - L2) "Air flow“ lights up. Then turn the potentiometer as further 1/2
turn beyond the switch point.
✓ The green LED (Fig. on the left - L3)
“"Open the shutter" lights up and the fail-
safe shutter is automatically moved to the
"OPEN" position.
Fig. 5.25: LED control elec­
tronics