Mitsubishi Electric FATEC FR-A800 Manual page 36

2
UNDERSTANDING INVERTER SYSTEM
Setting range and setting unit of sampling interval and sampling time

The setting range of the sampling interval and the sampling time are different for high speed
sampling and monitor sampling.
(a) High speed sampling (only for USB connections)
The sampling interval can be about 0.125 [ms] (mask count: 1) to about 20 [ms] (mask count:
30). The sampling time can be set up to "(mask count +1) × 4000". The sampling interval
varies depending on the control mode.
(b) Monitor sampling
The sampling interval and the sampling time change according to the communication
settings. The lower limit of the sampling interval is "number of sampling items × lower limit of
the sampling interval". Refer to the following table for the lower limit of the sampling interval.
For the maximum values, minimum values, and setting units of the sampling interval and
sampling time set under actual measurement conditions, refer to the following table.
Sampling interval
[ms]
Sampling time
[ms]
 If a fault trigger is set, the fault trigger is also counted as a sampling item.
 Even if a sampling time shorter than 3000 [ms] is set, the minimum sampling time of 3000 [ms] applies.
Example: When connecting to the serial port with a communication speed of 19200 bps, and
Communication
Communication
speed
port
[bps]
4800
9600
19200
Serial port
38400
57600
115200
USB -
Maximum value
60000
Sampling interval × 4000
monitoring the output frequency, output current, and output voltage as the data
items to be displayed in a graph.
Lower limit of the sampling interval = 100 [ms]
Maximum value of the sampling interval = 60000 [ms] (60 [s])
Minimum value of the sampling interval = 100 × 3 = 300 [ms]
Maximum value of the sampling interval = 60000 × 4000 = 240000000 [ms] (about
66.67 [h])
Minimum value of the sampling time = 300 × 50 = 15000 [ms] (15 [s])
Lower limit of the
sampling interval
[ms] 
250
150
100
100
50
50
50
Minimum value
Lower limit of the sampling interval
(table above) × number of the
sampling items 
Sampling interval × 50 
2.6 Inverter setup software
1
2
3
4
5
Setting increments
1
6
1
7
8
31