Siemens Maxum II Manual page 57

# Text
1965 ? Flame ignition failure
1966 ? Gain override
1967 ? Gain select not supported
1968 ? Igniter type changed
1997, ! Buffer Overflow TCD [L; U]
1998 %5 on %4
2005 ! Firmware error
2006 ! Bias off
Maxum edition II Analyzer General Maintenance
Manual, August 2018, A5E42019842001
4.6 Alarm Codes, Descriptions, and Suggested Actions
Description
TCD DPM Detector PIC: The FID flame
could not be lit within the predefined de‐
lay (25 or 60 sec). No other attempt will
be made to automatically light the flame
until the MANUAL IGNITION DO is acti‐
vated.
TCD DPM Detector PIC: An external sig‐
nal is applied to the DPM, overriding the
DPM gain control. This is a normal situa‐
tion if a signal is connected to the exter‐
nal gain-select connector.
TCD DPM Detector PIC: An attempt was
made to change the gain on a configura‐
tion that does not support the dual gain
feature. The request was ignored.
TCD DPM Detector PIC: The spark ignit‐
er was connected or disconnected during
an ignition sequence, causing the igni‐
tion sequence to be aborted.
DPM Detector PIC: The PIC detector da‐
ta buffer filled up before an I2C command
was received to retrieve the data.
Some data was lost. The SNECON was
not fast enough to retrieve the points or
the SNECON stopped polling without
turning off the corresponding detector
channel. This may happen with a combi‐
nation of a very high speed detector with
a large burst of I/O commands.
Firmware error
FID DPM Detector PIC: The detector is
used while the 300 Volts bias is disabled.
The data validity is unknown.
General Maintenance and Troubleshooting
Action
If associated with an alarm 2225 (Glow
plug failure), then diagnose and fix this
other alarm first. If a BASIC program is
used to control the electronic pressure
controller (EPC) to adjust the gas mix‐
ture for proper ignition, confirm that the
poll rate of the 'IGNITE' DI is set to 2
sec. Check that the gas supply pres‐
sure is adequate. Verify the proper op‐
eration of the EPC.
If no external signal is connected, re‐
place the DPM.
Remove access to the GAIN_ALT_SE‐
LECT DO.
Verify that the igniter is properly con‐
nected. Replace the igniter. Replace
the DPM.
Stagger the balance events and valve
switching events by approximately
10-20 ms to distribute the load on the
I2C bus.
Disconnect the SNECON debug cable
(if connected) and reset.
Reload the SNECON OS and APP soft‐
ware.
Contact Customer Support.
Set the 'disable bias' DO to '0'.
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