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Page 71
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Maintenance
B800-00-880 Issue D
5.5.1
Flashing service codes
Whenever a service is required the standard once per revolution flash on the yellow status LED is replaced with a
service flash code. The service flash codes are specified in
Table 26
.
5.5.2
Decoding service status words
The service status may be accessed directly via the serial link. This method of accessing service status will give the
most complete picture of current and future service requirements and will allow preventative maintenance activities
to be scheduled.
A summary of the current pending service status is provided in response to the service status command:
The reply will be as follows:
The service status word is made up of 8 hexidecimal digits. To decode this word, convert each digit into a 4-digit
binary number as described in
Section 5.5.9
.
Each binary digit (bit) represents a flag that is either active (state 1) or not active (state 0). To help decode the
service status word, each bit is numbered (starting with 0 for the least significant to 31 for the most significant) as
shown in
Section 5.5.3
. The meaning of each bit in the service status word is given in
Table 27
.
Table 26 - Flashing service codes
Service flash code
Comments
Actions
LED on 1sec
LED off 1sec
Oil cartridge service recommended
It is recommended that the oil
cartridge is replaced. Refer to
Section 7.2
.
LED on 3sec
LED off 1sec
Bearing and oil cartridge service
recommended
It is recommended that the bearing
and oil cartridge are replaced. Refer
to
Section 7.2
.
LED on 3sec
LED off 3sec
Pump service required
The turbo impeller or controller has
reached its expected life. It is
recommended that the pump is
returned to an Edwards service centre
for service. Refer to
Section 7.2
.
Command
?
V
8
8
1
cr
Reply
=
V
8
8
1 sp
h
h
h
h
h
h
h
h
cr
Table 27 - Service flags
Bit number
Status flag
Active flag means
0
Oil cartridge service due
Set when hours until oil cartridge service due = 0
1
Bearing service due
Set when hours until bearing service due = 0
2
Pump service due
Set when hours until pump service due = 0
or cycles until pump service due = 0
3
Controller service due
Set when hours until controller service due = 0
4
Reserved
-
5
Reserved
-
6
Reserved
-
