Cooker Burner (Control Box Type DKO 970N) - Information system
The information system is microprocessor based and reports on all aspects of burner control box operation and flame
supervision. It informs continuously about the actual programming sequence the unit is just performing. Besides monitoring
of the programming sequence it also allows to identify errors during start-up of operation without any additional testing
devices. The automatically performed diagnoses is a valuable tool which facilitates service/maintenance work and
therefore saves costs. The analyses of the error cause can be done directly on stage or if not possible afterwards at the
lockout reason is stored in a non-volatile lock out mode memory.
The information system communicates with the outside world using a LED (the used Flash-Code is similar to the Morse-
Code). The messages are optically transmitted by flashing apprioriately a LED. Using an (optional) additional terminal the
messages can be recorded and displayed in easy readable form.
Programming sequence display
The built-in microprocessor controls not only the programming sequence but the information system too. The individual
phases of the programming sequence are displayed as Flash-Code.
The following messages can be distinguished:
Fault Finding
28
Fig. 37 DESN 516837
Lock-out diagnoses
In case of failure the LED is permanently illuminated. Every 10 seconds the illumination is interrupted by a flash code,
which indicates the cause of the error. Therefore the following sequence is performed which is repeated as long as the
unit is not reset.
Sequence:
Stray Light Monitoring
The stray light check is performed at the end of the pre-purge time for the duration as mentioned in the table of timings
Blinking Codes: See Fig. 37A
Model
Pre-purge and
pre-ignition time
tv1
stray light
monitoring
tf
safety time
ts
post-ignition
time after v1
tn
delay time to V2
DKO 972-N-only
tv2
05 15 5 5 7 20
Table of timings (sec.)
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