Hitachi SJ700-2 instruction manual Low-current indication LOC signal, Forward rotation signal FWR

Chapter 4 Explanation of Functions

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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

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		00	Enabling the signal output during
	C038		operation
output mode selection		01	Enabling the signal output only
			during constant-speed operation (*1
Low-current indication signal	C039	0.0 to "2.0 x rated	Setting of the threshold current level
			at which to output the low-current
detection level		current" (A)
			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).

Output current (A)

Low-current indication signal detection level (C039)

Low-currentON indication signal

ON

4.2.73 Inverter ready signal (IRDY)

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The inverter outputs the inverter ready (IRDY) signal when it is ready for C021 to C025: Terminal [11] to [15] functions

operation (i.e., when it can receive an operation command). C026: Alarm relay terminal function

-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.

Related code

C021 to C025: Terminal [11] to [15] functions

C026: Alarm relay terminal function

Item	Function code		Data or range of data	Description
Terminal function	C021 to C025		51	FWR: Forward rotation signal
Alarm relay terminal function	C026
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