8 | Maintenance
172
D-R 290
Se
qu.
no.
Simple fault Cause;
(●) available actions by whom
[140] Stepper motor error The stepper motor driver has reported a fault.
● Check the stepper motors for correct operation,
check that plug X4 is securely seated
● If the error occurs repeatedly or over an exten
ded period, the electronics may be defective
Specialised
personnel
[141] Stepper motor error The stepper motor driver has reported a fault.
➔ Check the stepper motors for correct operation,
check that plug X4 is securely seated
● If the error occurs repeatedly or over an exten
ded period, the electronics may be defective
Specialised
personnel
[142] Purge air flow 1 (measuring
head) too low
Purge air flow is below the fault threshold. Possible
causes: Blower defective, filter clogged, purge air
hose split, parameterisation of the purge air inlet
defective.
● It can be expected that the measurement func
tion may be impaired by dust in the welded-in
pipes, by a rapid increase in contamination or
damage to the device due to high temperatures.
Check the purge air flow / restore the flow or re
move the device from the flue stack.
Specialised
personnel
[143] Purge air flow 2 (reflector) too
low
Purge air flow is below the fault threshold. Possible
causes: Blower defective, filter clogged, purge air
hose split, parameterisation of the purge air inlet
defective.
● It can be expected that the measurement func
tion may be impaired by dust in the welded-in
pipes, by a rapid increase in contamination or
damage to the device due to high temperatures.
Check the purge air flow / restore the flow or re
move the device from the flue stack.
Specialised
personnel
[144] Fail-safe shutter 1 (measuring
head) closed
The fail-safe shutter at the measuring head is
closed. This means that valid measurement values
are no longer being reported.
● Check the reason for closure of the shutter (has
the purge air failed?)
Operating
personnel
[145] Fail-safe shutter 2 (reflector)
closed
The fail-safe shutter at the reflector is closed. This
means that valid measurement values are no lon
ger being reported.
● Check the reason for closure of the shutter (has
the purge air failed?)
Operating
personnel
Table 8.4: List of simple faults for the D‑R 290
Se
qu.
no.
Critical fault Cause;
(●) available actions by whom
[192] Hardware fault The electronic hardware of the device has a serious
internal fault.
● Exchange the electronics (No. 22)
Service technician
[193] Hardware fault The electronic hardware of the device has a serious
internal fault.
● Exchange the electronics (No. 22)
Service technician
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