Datex-Ohmeda F-LM1 Technical Reference Manual page 268

Datex-Ohmeda S/5 Light Monitor and Light Solo
Table 2
Error bit Description
BCOM Communication
between battery and
monitor is lost.
BDATA Data in the battery
pack memory was
corrupted and the
battery memory has
been initialised by
factory defaults.
TEMPFLT Temperature
measurement of the
battery pack is
inoperative.
CELLFLT Low voltage over the
battery pack.
If error bits are set one at a time without any other bit being set (Table 1, bold text):
−
−
−
−
Probably the most common error message is "Error 29" which means that all the possible failures
on the battery have occurred. This is commonly a problem with the contacts inside the battery
module. All the battery information is stored in the battery memory inside the battery pack and is
read upon main CPUs request. Contact failure can be checked in the Service view: if Status = FFh,
Faults = 1Dh, capacities are 24570 and charge/discharge cycles are 16383, it is clearly due to
poor contact.
One faulty battery pack can stock still the whole battery bus. In that case all the battery data is on
logical "0" or "1". That is why the batteries should be checked one battery in the module at a time.
During Error 29 the battery window on the display is empty followed by a ? mark.
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Document No. 890200-5
Setting and resetting the error bits
Setting the bit
The bit is set if reading the test
byte from the battery is not
successful (test is done when
installing the battery pack into
the slot and during recharge
initialisation).
This bit will not be set.
If the temperature measurement
result is not within specified
limits (poor contact, no contact
or short circuit on the battery
pack).
The check is done like in BCOM
and CELLFLT.
Battery voltage is below 10 V.
The check is done like in BCOM
and TEMPFLT.
BCOM: either poor contact in the battery module or battery memory failure. Try in another
battery slot.
BDATA: Normally this does not appear alone. This will be reset after following procedure:
Recharge the battery to full, discharge completely empty and start recharging again.
TEMPFLT: either poor contact inside the battery module or a real temperature failure
(Temperature out of specifications). Try in another battery slot.
CELLFLT: either poor contact inside the battery module or failure on single/multiple battery
cell. Try in another battery slot. Monitor uses trickle charge for refreshing the battery. Fault is
cleared during recharge initialisation if voltage has arisen above 10 V.
Resetting the bit
If test byte read is successful.
If during recharge initialisation is
noticed that the battery has been
completely discharged and the
latest recharge has been completed
and been successful (slope detected
as a sign of completed recharge).
If battery temperature is within
limits:
-30 °C < T < +70 °C.
(Note in the Service View:
-300 < T < +700).
If battery voltage is over 10 V.