Hitachi SJ700-4000HFU2

Chapter 4 Explanation of Functions
4-69
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
Function code
Data or range of data
Description
Terminal function
C021 to C025
43
LOC: Low-current indication signal
Alarm relay terminal function
C026
Low-current indication signal
output mode selection
C038
00
Enabling the signal output during
operation
01
Enabling the signal output only during
constant-speed operation (*1
Low-current indication signal
detection level
C039
0.0 to 2.0 x rated current (A)
Setting of the threshold current level at
which to output the low-current
indication signal
(*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).
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
Function code
Data or range of data
Description
Terminal function
C021 to C025
50
IRDY: Inverter ready signal
Alarm relay terminal function
C026
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
Function code
Data or range of data
Description
Terminal function
C021 to C025
51
FWR: Forward rotation signal
Alarm relay terminal function
C026
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
Related code
C021 to C025: Terminal [11] to [15] functions
C026: Alarm relay terminal function
Related code
C021 to C025: Terminal [11] to [15] functions
C026: Alarm relay terminal function
Related code
Output current (A)
Low-current indication
signal detection level
(C039)
Low-current indication
signal
ON
ON