DURAG D-R 290, Руководство по эксплуатации

Страница: 164 / 202

8 | Maintenance
164 D-R 290
Setting path:
Device (D‑R 290 ) >
> Functions >
D‑R 290
Service
Functions > Test the
fail-safe shutter
1
or
Device (D‑R 290 ) >
> Functions >
D‑R 290
Service
Functions > Test the
fail-safe shutter
2
The fail-safe shutter is operating correctly if during the test the shutter closes once and
opens again.
At intervals of approx. 6 months the operational status of the supercaps should also
be tested:
●
Check LED 5 on the control electronics (figure on the left – L5).
The LED will light up if the supercaps charging status is OK.
A possible cause of any malfunction is a defect in the charging electronics or a defec­
tive supercap.
In such cases, check the charging electronics ( printed circuit board D-SK AE no.30
mains adaptor) and replace them if they are defective.
Checking the battery in the measuring head
The battery in the measuring head buffers the power supply for the internal clock with­
in the measuring head. This clock provides system messages with timestamp.
After a long time in storage without a power supply this battery can become dis­
charged. Frequent occurrence of the warning [81] (see [
}
168] ) "Clock not set" may
also indicate a discharged battery.
To change the battery, proceed as follows:
Opening the housing
1. Open the four quick-release clamps and swing down the measuring unit.
2. The 6 screws for the housing cover are accessible internally. Undo them in the se­
quence specified at the bottom left.
Before undoing the last screw (6) grasp the handle of the housing cover with one
hand, so that the housing cover is supported by the lower arm.
3. Put the housing cover aside.
Checking the
supercaps
Fig. 8.8: LED 5
8.2.12
Open the housing:
First pull the plug
then open the door
Fig. 8.9: Attachment screws
for the
housing cover