JLG 510AJ Service Manual - Manual (Page 137)

SECTION 3 - CHASSIS AND TURNTABLE
3121181 – JLG Lift – 3-95
Once an active fault has occurred two sets of data are
recorded, fault snapshot and flight data recorder. The fault
snapshot (FSS) is a sample of data taken at the instance the
fault triggered. Variables included in the FSS are defined in the
Snapshot Base and Snapshot Custom Definition fields found
on the Faults Page. A FSS is saved with each of the first eight
(8) faults for the first time the fault becomes active. Conversely,
the flight data recorder (FDR) is a ten-second stream of data
that includes eight-seconds prior and two-seconds after trig-
gering the fault. An FDR is saved for each of the first two (2)
faults for the first time the fault becomes active. Variables
included in the FDR are defined in the Flight Data Base and
Flight Data Custom Definition fields found on the Faults Page. The memory location of the FDR is RAM, therefore this data is
only available if the ECM has not lost battery power. In addi-
tion, if there is a “Dirty Flash Page” in the ECM, the FDR data
will not be available. The memory location of the FSS data is
EEPROM and is retained when the ECM loses battery power.
Both sets of data are accessed from the Historic Fault Informa-
tion interface and can be saved to the PC upon retrieval. Base
variables for FSS and FDR are generally defined by the OEM to
include variables most often referenced during fault diagnosis.
The base definitions are not fault dependent. Additional vari-
ables may be selected for capture during a fault occurrence
through a single, left-click of the custom table and selecting
the desired variables from a list. An example of custom fault
variable definitions is shown in Figure 3-73.
Figure 3-72. Faults Page with Historic Fault Message