Mitsubishi FR-A800

(T) Multi-Function Input Terminal Parameters
PARAMETERS
427
5
GROUP
T
Analog current input loss condition (Pr.778)
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.
Continue operation at analog current input loss (Pr.573 = "1, 4", Pr.777)
• When Pr.573 = "1", operation is continued with the output frequency before the current input loss.
• When Pr.573 = "4" and Pr.777  "9999", operation is continued with frequency set in Pr.777.
• When the start command is turned OFF during the input current loss, deceleration stop is immediately performed, and the
operation is not restored even if start command is input again.
• When the current input is restored, the LF signal is turned OFF, and operation is performed according to the current input.
• External operation
• PID control (reverse action)
NOTE
• When the setting is changed to continuously operate after the input current loss (Pr.573 = "1, 4"), the motor will operate as
the frequency before loss is 0 Hz.
 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.
• 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 assigns the function.
4mA2mA
60Hz
20mA
∗1
Set frequency
Analog input
When C3 (C6) = 0%
Normal use range
Current input
decrease detection
2mA
3mA
STF
20mA
4mA
LF signal
Analog input
Pr.573=1 : Operation continued with the frequency before being lost
Pr.573=4 : Operation continued with Pr.777 setting
Return
Time
Input current
decrease
Output frequency
20mA
4mA
2mA
3mA
On during input decrease
Return
Input current
decrease
Set point (fixed)
Measured value
PID signal
LF signal
Time
Output frequency
Pr.573=1 : Operation continued with the frequency before being lost
Pr.573=4 : Operation continued with Pr.777 setting
STF