SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
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Chapter 4 Explanation of Functions<br />
4.2.72 Low-current indication (LOC) signal<br />
The inverter outputs the low-current indication (LOC)<br />
signal when the inverter output current falls to the<br />
low-current indication signal detection level (C039) or<br />
less.<br />
Related code<br />
C021 to C025: Terminal [11] to [15] functions<br />
C026: Alarm relay terminal function<br />
C038: Low-current indication signal output mode selection<br />
C039: Low-current indication signal detection level<br />
You can select one of the two signal output modes with the low-current indication signal output mode<br />
selection (C038). In one mode, the LOC signal output is always enabled during the inverter operation. In<br />
the other mode, the LOC signal output is enabled only while the inverter is driving the motor for<br />
constant-speed operation.<br />
Item Function code Data or range of data Description<br />
Terminal function<br />
C021 to C025<br />
43 LOC: Low-current indication signal<br />
Alarm relay terminal function C026<br />
Enabling the signal output during<br />
00<br />
Low-current indication signal<br />
operation<br />
C038<br />
output mode selection<br />
Enabling the signal output only<br />
01<br />
during constant-speed operation (*1<br />
Setting of the threshold current level<br />
Low-current indication signal<br />
0.0 to "2.0 x rated<br />
C039<br />
at which to output the low-current<br />
detection level<br />
current" (A)<br />
indication signal<br />
(*1) When 01 (control circuit terminal) is selected as frequency source setting (A001), there is a case that<br />
inverter does not recognize the speed as constant value due to sampling. In this case, adjusting is to be<br />
made by setting C038=00 (valid during operation) or increasing analogue input filter (A016).<br />
Output current (A)<br />
Low-current indication<br />
signal detection level<br />
(C039)<br />
Low-current<br />
indication signal<br />
ON<br />
ON<br />
4.2.73 Inverter ready signal (IRDY)<br />
Related code<br />
The inverter outputs the inverter ready (IRDY) signal when it is ready C021 to C025: Terminal [11] to [15] functions<br />
for operation (i.e., when it can receive an operation command). C026: Alarm relay terminal function<br />
- The inverter can recognize only the operation command that is input while the IRDY signal is output.<br />
- If the IRDY signal is not output, check whether the input power supply voltage (connected to the R, S, and T<br />
terminals) is within the range of specification.<br />
- Signal is not output when the power is given only to control power supply.<br />
Item Function code Data or range of data Description<br />
Terminal function<br />
C021 to C025<br />
50 IRDY: Inverter ready signal<br />
Alarm relay terminal function<br />
C026<br />
4.2.74 Forward rotation signal (FWR)<br />
The inverter continues to output the forward rotation (FWR) signal<br />
while it is driving the motor for forward operation.<br />
The FWR signal is turned off while the inverter is driving the motor for<br />
reverse operation or stopping the motor.<br />
Item Function code Data or range of data Description<br />
Terminal function<br />
C021 to C025<br />
51 FWR: Forward rotation signal<br />
Alarm relay terminal function<br />
C026<br />
4 - 70<br />
Related code<br />
C021 to C025: Terminal [11] to [15] functions<br />
C026: Alarm relay terminal function
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