Siemens 7MB2041, Руководство по эксплуатации, Страница: 113 / 152

Repair, maintenance and servicing
6.6 Removing faults
OXYMAT 64
Operating Instructions, 06/2008, A5E00880383-03
111
6.6.3 Fault messages
Defects in the hardware or changes in the device parameters which would result in the
device being unable to make reliable measurements lead to a fault message.
"Fault" then
appears in the status line if the device is in measuring mode.
The faults listed below result in a fault message (output in the display) and are signaled
externally if a corresponding relay has been configured using function 71. Immediate
remedial measures should always be carried out here by qualified maintenance personnel.
Function 87 can be used to switch off (deactivate) each fault individually.
Table 6- 3 Possible fault messages
No. Fault message Possible cause Remedy
S1
Q
Parameter memory test
failed
EPROM contains incorrect or
incomplete data in the working area
Carry out RESET; if the fault message S1 is
still displayed:
1.
Load user data (function 75);
if the fault message S1 is still displayed:
2. Inform Service
Important: leave analyzer in operation in
order to facilitate fault diagnostics by the
servicing personnel!
S4 External fault message External signal Check; function 72 must be configured
accordingly
Temperature control of sensor faulty S5
Q
Temperature of O
2
sensor
too high or too low
Sample gas flow is too high (>>
125 ml/min)
Set flow to 125 ml/min
S8
Q
Signal of pressure sensor
outside tolerance
Flow resistance too large in the
sample gas outlet line
Reduce flow resistance until sample gas
pressure is below 100 hPa (rel.)
S10
Q
24 h RAM/Flash check RAM or Flash-PROM Replace motherboard; inform service
department
S12
Q
Mains power supply Line voltage outside tolerance Line voltage must be within the specified
limits according to the type nameplate
Crystal or ext. ADC faulty Replace motherboard S13
Q
Hardware / line frequency
Line frequency outside tolerance Connect power supply stabilizer
O
2
content in sample gas too high as
result of leak in sample gas path
Carry out leak test S14 Measured value greater
than full-scale value (+ 5%)
Sample gas pressure too high Check sample gas pressure and reduce if
necessary
Fault during calibration via binary
input
S15
Q
Calibration aborted
Fault if the analyzer is in Autocal
mode
Eliminate the cause of the fault message
S16 Sample gas flow too low Pressure in sample gas supply line
too low
Provide sufficient pressure
(> 2000 hPa)