Mitsubishi Electric FR-A700 EC, Instruction Manual

Page: 714 / 826

Useful functions Parameter
6 - 534
Setting of the Pr. 555 "Current average time"
The average output current is calculated during Hi output of start bit (1s). Set the time taken to
average the current during start bit output in Pr. 555.
Setting of Pr. 557 "Current average value monitor signal output reference current"
Set the reference (100%) for outputting the signal of the current average value. Obtain the time
of the low pulse after a fixed start pulse of 1s from the following calculation.
Note that the output time range is 0.5 to 9s, and it is 0.5s when the output current average value
is less than 10% of the setting value of Pr. 557 and 9s when it exceeds 180%.
Output of Pr. 503 "Maintenance timer"
After the output current average value is output as low pulse shape, the maintenance timer value
is output as high pulse shape. The output time of the maintenance timer value is obtained from
the following calculation.
Note that the output time range is 2 to 9s, and it is 2s when Pr. 503 is less than16000h and 9s
when it exceeds 72000h.
Fig. 6-269:
Signal output time for the current average
value
I001266E
Example
쑴
When Pr. 557 = 10A and the average value of output current is 15A, the current average
value monitor signal is output as low pulse shape for 7.5s.
쑶
Fig. 6-270:
Signal output time for the maintenance output
value
I001267E
Output current average value
Pr. 557
-----------------------------------------------------------------------------
5s (output current average value 100 %/5s)
×
Signal output
time
(s)
Output current average value
Signal output time
15A
10A
----------
5s
×
7.5s = =
Pr. 503
40000h
--------------------
5s (Maintenance timer value 100%/5s)
×
Signal output
time
(s)
Maintenance timer value
(h)