Mitsubishi Electric FR-A820-00046 Instruction Manual page 814

(A) Application parameters
Selection of trace mode (Pr. 1021)
● Select how to save the trace data which results from sampling the inverter status.
● There are two trace data save methods, memory mode and recorder mode.
Pr. 1021
setting
0
1
2
Tab. 5-259: Selection of trace mode
NOTES When the trace function is used in the recorder mode, use a USB memory device having at least
1 GB of free space.
Data transferred to USB is saved in the "TRC" folder under the "FR_INV" folder.
Up to 99 sets of trace data can be saved in the USB memory device. When data transfer to USB
memory device reaches 99 sets of trace data, data is successively overwritten starting with the
older data.
Setting of sampling cycle (interval) and number of sampling channels (Pr. 1022, Pr. 1023)
● Set the sampling cycle (interval).
The shortest cycle in the recorder mode is 1 ms. When the recorder mode is set, sampling is
performed at a sampling cycle of 1 ms even if "0, 1" is set to Pr. 1022 "Sampling cycle".
● When the memory mode is set, the number of analog channels to sample can be set in the Pr.
1023 "Number of analog channels". Start setting from the smaller channel number. Up to eight
channels can be set. The sampling time becomes shorter the more channels are set.
The number of channels is always 8 when the recorder mode is used or when digital channels are
used.
● The sampling time differs according to the sampling cycle and number of sampling channels.
Number of channels
Tab. 5-260: Memory mode sampling time
5 - 612
Mode Description
Memory In this mode, trace data is saved sequentially to internal RAM on the inverter.
mode
If automatic transfer is set, the trace data in internal RAM is transferred to USB memory device
when the trigger is being generated.
Memory
Data can be transferred to a USB memory device as long as data is held in internal RAM.
mode
Trace data in internal RAM is cleared when the power supply is turned OFF or when the inverter
(automatic
is reset.
transfer)
In this mode, trace data is saved directly to USB memory device.
Recorder
Sampling data is fixed at eight analog channels and eight digital channels.
mode
The sampling cycle in this mode is longer than in the memory mode. (1 ms or longer)
Minimum (Pr. 1022 = "0")
1
2
3
4
5
6
7
8
Memory mode sampling time
213 ms
160 ms
128 ms
106.5 ms
91.8 ms
80.0 ms
71.8 ms
60 ms
Parameters
Maximum (Pr. 1022 = "9")
1704 s
1280 s
1024 s
852 s
728 s
640 s
568 s
512 s