DURAG D-R 290, Operating Manual

Page: 81 / 202

5 | Installation
D-R 290 81
No. LED Behaviour Function
1 Permanently lit during operation Ready for operation
2 Lights up continuously when the measuring
head is in maintenance mode
Maintenance
Flashes at a 1-second interval (duty ratio
50/50) when the measuring head has a
warning / information in the memory
Warning
3 Flashes at a 1-second interval (duty ratio
50/50) when the measuring head has
saved a defect/failure
Failure
see section Faults
Flashes alternately green (4) when a de­
fective DURAG Modbus bus frame has
been received
Data errors
4 Flashes when a DURAG Modbus frame is
received
DURAG Modbus
active
Flashes alternately red (3), when a defec­
tive DURAG Modbus frame has been re­
ceived (see above)
Data errors
1 green - 2 yellow - 3 red - 4 green
Table 5.3: Meaning of the LEDs and their flash codes
Configuration of the relay outputs
The contact settings of the relays (normally closed/normally open) on the D‑R 290 can
be configured.
Risk of contamination; perform the contamination check
If the D‑R 290 device casing is opened, the device together with the optical
components within it is no longer watertight and dust-tight. There is risk of
contamination of the optical components. If a particular degree of contamination is
exceeded, the device signals a defect condition and ceases to perform
measurements.
▶
Clean the device casing before opening it.
▶
Open the device only in a clean dry environment.
▶
Do not expose the opened device to the weather (rain, snow, sandstorms …).
Fig. 5.13: (LEDs in the meas­
uring head)
5.4.7