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Chapter 4
4.2.72 Low-current indication (LOC) signal
The inverter outputs the low-current indication (LOC) signal
when the inverter output current falls to the low-current
indication signal detection level (C039) or less.
You can select one of the two signal output modes with the low-current indication signal output mode selection (C038).
In one mode, the LOC signal output is always enabled during the inverter operation. In the other mode, the LOC signal
output is enabled only while the inverter is driving the motor for constant-speed operation.
Item
Terminal function
Alarm relay terminal function
Low-current indication signal
output mode selection
Low-current indication signal
detection level
(*1) When 01 (control circuit terminal) is selected as frequency source setting (A001), there is a case that inverter does
not recognize the speed as constant value due to sampling. In this case, adjusting is to be made by setting C038=00
(valid during operation) or increasing analogue input filter (A016).
Output current (A)
Low-current indication
signal detection level
(C039)
Low-current indication
signal
4.2.73 Inverter ready signal (IRDY)
The inverter outputs the inverter ready (IRDY) signal when it is ready for
operation (i.e., when it can receive an operation command).
- The inverter can recognize only the operation command that is input while the IRDY signal is output.
- If the IRDY signal is not output, check whether the input power supply voltage (connected to the R, S, and T terminals) is within the
range of specification.
- Signal is not output when the power is given only to control power supply.
Item
Terminal function
Alarm relay terminal function
4.2.74 Forward rotation signal (FWR)
The inverter continues to output the forward rotation (FWR) signal while it is
driving the motor for forward operation.
The FWR signal is turned off while the inverter is driving the motor for reverse
operation or stopping the motor.
Item
Terminal function
Alarm relay terminal function
Function code
Data or range of data
C021 to C025
C026
C038
C039
0.0 to 2.0 x rated current (A)
ON
Function code
Data or range of data
C021 to C025
C026
Function code
Data or range of data
C021 to C025
C026
4-69
Explanation of Functions
Related code
C021 to C025: Terminal [11] to [15] functions
C026: Alarm relay terminal function
C038: Low-current indication signal output mode selection
C039: Low-current indication signal detection level
43
LOC: Low-current indication signal
Enabling the signal output during
00
operation
Enabling the signal output only during
01
constant-speed operation (*1
Setting of the threshold current level at
which to output the low-current
indication signal
ON
Related code
C021 to C025: Terminal [11] to [15] functions
C026: Alarm relay terminal function
50
IRDY: Inverter ready signal
Related code
C021 to C025: Terminal [11] to [15] functions
C026: Alarm relay terminal function
51
FWR: Forward rotation signal
Description
Description
Description
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