Mitsubishi Electric FR-A800, Инструкция по эксплуатации

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Parameters (T) Multi-Function Input Terminal Parameters
FR-A800 5 - 417
5.12.7 Checking of current input on analog input terminal
When current is input to the analog input terminal 2 and terminal 4, operation when the current input
has gone below the specified level (loss of analog current input) can be selected. It is possible to con-
tinue the operation even when the analog current input is lost.
Analog current input loss condition (Pr. 778)
●
When the condition of current input to the terminal 4 (terminal 2) continues to be 2 mA or less
for Pr. 778 setting time, it is considered as loss of analog current input and alarm (LF) signal is
turned ON. The LF signal will turn OFF when the current input becomes 3 mA or higher.
●
For the LF signal, set "98 (positive logic) or 198 (negative logic)" in any of Pr. 190 to Pr. 196 "output
terminal function selection" to assign the function.
Pr. Name Initial value Setting range Description
573
T052
4 mA input check selection 9999
1
Continues the operation with output
frequency before the current input loss.
2
4 mA input fault is activated when the
current input loss is detected.
3
Decelerates to stop when the current
input loss is detected. After it is stopped,
4 mA input fault (E.LCI) is activated.
4
Continues operation with the Pr. 777
setting.
9999 No current input check
777
T053
4 mA input check operation
frequency
9999
0 to 590 Hz
Set the running frequency for current
input loss. (Valid when Pr. 573 = "4")
9999 No current input check when Pr. 573 = "4"
778
T054
4 mA input check filter 0 s 0 to 10 s Set the current input loss detection time.
Fig. 5-202:
4mA input check of current input
I001196E
NOTE Changing the terminal assignment using Pr. 190 to Pr. 196 (output terminal function selection)
may affect the other functions. Set parameters after confirming the function of each terminal.
When the Pr. 573
≠
"9999" and terminal 4 (terminal 2)
is calibrated to 2 mA or less with C2 (Pr. 902)
(C5 (Pr. 904)), analog input frequency that is 2 mA or
less will become input current loss, thus it will not be
as the bias setting frequency.
60 Hz
2 mA
4 mA 20 mA
Normal use range
Analog
input
Current input
decrease detection
When C3 (C6) = 0 %
Set frequency