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8.2
Traceback
The drive unit features a traceback function that saves the status of the drive before and after fault occurrence.
Traceback data is useful for failure cause analysis. The inverter (TMdrive-30) and converter (TMdrive-P30) can
save traceback data for up to 7 fault occurrences, respectively.
Each traceback data consists of high-speed traceback 14 channels, standard traceback 28 channels, and long
traceback 8 channels, and sequence trace.
Table 8.2.1 lists the characteristics of high-speed, standard, and long traceback data. Figure 8.2.1 shows the
data collection time for each traceback data.
Table 8.2.1 Characteristics of Traceback Data
Type
Quantity of Sampling Sampling cycle
No. of
channels
Signals to be saved
High-speed
traceback
256 items
(30 items after fault
occurrence)
Current control cycle
(When the carrier
frequency is 1536Hz,
325µs)
14ch
IU_F, IW_F, IQ_REF, ID_REF,
IQ_FBK, ID_FBK, EQ_R, ED_R,
E1_R, VU_REF, VV_REF,
VW_REF,
VU_REF_B, VV_REF_B
Standard
traceback
256 items
(30 items after fault
occurrence)
1ms 28ch
Set by $TRB01_OP_AS ~
$TRB28_OP_AS
Long
traceback
256 items
(items for 500ms after
fault occurrence)
Set by
$TRB_TIME_LONG
(standard: 10ms)
8ch
Set by $TRB_L1_OP_AS ~
$TRB_L8_OP_AS
Sequence traceback records the change of fault sequence for up to 400ms after the change of the first occurred
fault sequence.
Fig. 8.2.1 Traceback Data Collection Time
The recorded traceback data can be displayed and saved using the maintenance tool.
By adjusting the timer of the drive unit from the maintenance tool immediately after the fault occurrence and
before absorbing data, the fault occurrence time to be recorded as traceback data can be corrected to more
accurate time.
Fault occurrence point
Time
Long traceback
Standard traceback
High-speed traceback
Sequence trace
7.2 ~ 9.8ms
400ms
30ms
500ms
55.2 ~ 73.6ms
226ms
$TRB_TIME_LONG
×256 - 500ms
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