Hitachi SJ700-2 - Manual (Page 132)

Chapter 4 Explanation of Functions
4 -
69
4.2.72 Low-current indication (LOC) signal
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
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
Alarm relay terminal function C026
43 LOC: Low-current indication signal
00
Enabling the signal output during
operation
Low-current indication signal
output mode selection
C038
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)
Output current (A)
Low-current indication
signal detection level
(C039)
Low-current
indication signal ON ON
Item
The inverter outputs the inverter ready (IRDY) signal when it is ready for
operation (i.e., when it can receive an operation command). C021 to C0
- The inverter can recognize only the operation command that is input while the IRDY signal is output.
25: Terminal [11] to [15] functions
C026: Alarm relay terminal function
Related code
- 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.
Function code Data or range of data Description
Terminal function C021 to C025
Alarm relay terminal function C026
50 IRDY: Inverter ready signal
4.2.74 Forward rotation signal (FWR)
The FWR signal is turned off while the inverter is driving the motor for
reverse operation or stopping the motor.
The inverter continues to output the forward rotation (FWR) signal while
it is driving the motor for forward operation.
C021 to C025: Terminal [11] to [15] functions
C026: Alarm relay terminal function
Related code
Item Function code Data or range of data Description
Terminal function C021 to C025
Alarm relay terminal function C026
51 FWR: Forward rotation signal