4Ma Input Check Of Current Input (Pr. 573) - Mitsubishi Electric FR-F740-00023-EC Instruction Manual

Frequency setting by analog input (terminal 1, 2, 4)

3.15.5 4mA input check of current input (Pr. 573)

When inputting 4 to 20mA current to terminal 2 or terminal 4, decrease in analog current input is detected to
Pr.571
enable continuous operation even if input has decreased.
page 81
Pr.575
page 190
Parameter
Number
573 4mA input check selection
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 146.)
Set frequency
60Hz
Current input
decrease detection
*
2mA
* When Pr.573 = "1", input decrease is detected (LF signal output) even if
the analog input value to bias frequency of terminal 2 or terminal 4 is set
to 2mA or less using C2 (Pr. 902) or C5 (Pr. 904) and the value is not as
bias frequency settings.
Output frequency
Analog input
Output frequency
CAUTION
· When terminal assignment is changed using Pr. 190 to Pr. 196 (output terminal function selection), the other functions may be
affected. Please make setting after confirming the function of each terminal.
140
Name
When C3(C6) = 0%
4mA 20mA
Normal use range
During external operation (Pr. 573=1)
20mA
4mA
STF
LF signal
During PID control (reverse action) (Pr. 573=1)
20mA
Set point (fixed)
Measured value
4mA
STF
LF signal
PID signal
Setting
Initial Value
Range
1
9999
9999
(1) Operation at a current input decrease
continues (Pr. 573 = "1")
⋅ When the input current of terminal 4 (terminal 2) falls
2mA or below, output minor fault signal (LF) is output.
⋅ When the current falls below 2mA, the output
frequency (average value) before detection is retained
and operation at the retained frequency continues.
⋅ When the current input increases above 3mA, the
LF signal output is turned off and the inverter
Analog input
operates according to the current input.
⋅ For the LF signal, set "98 (positive logic) or 198
(negative logic)" in Pr. 190 to Pr. 196 (output
terminal function selection) and assign functions to
the output terminal.
⋅ Since turning off the start command clears the
retained frequency, the inverter does not operate at
the retained frequency even if restarted.
Operation
continue
Input current
decrease
2mA
Operation
continue
Input current
decrease
2mA
On during input decrease
Description
When the current input drops to or below 2mA,
the LF signal is output and inverter continues
operation at the frequency (average value) just
before current reaches 2mA.
4mA input is not checked.
Return
3mA
Time
Return
3mA
Time