SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.

Chapter 4 Explanation of Functions
4.2.62 Running time over and power-on time over signals (RNT and ONT)
The inverter outputs the operation time over (RNT) signal or the
plug-in time over (ONT) signal when the time specified as the
run/power-on warning time (b034) is exceeded.
Item Function code Range of data Description
Disabling the signal output
0.
Setting in units of 10 hours
Run/power-on warning time b034
1. to 9999.
Setting in units of 100 hours
1000 to 6553
(range: 100,000 to 655,300 hours)
(1) Operation time over (RNT) signal
To use this signal function, assign function "11" (RNT) to one of the intelligent output terminals [11] to [15]
(C021 to C025) and the alarm relay terminal (C026).
Specify the run/power-on warning time (b034).
(2) Plug-in time over (ONT) signal
To use this signal function, assign function "12" (ONT) to one of the intelligent output terminals [11] to [15]
(C021 to C025) and the alarm relay terminal (C026).
Specify the run/power-on warning time (b034).
4.2.63 0 Hz speed detection signal (ZS)
The inverter outputs the 0 Hz speed detection signal when the inverter
output frequency falls below the threshold frequency specified as the
zero speed detection level (C063).
To use this signal function, assign function "21" (ZS) to one of the
intelligent output terminals [11] to [15] (C021 to C025) and the alarm relay
terminal (C026).
Related code
b034: Run/power-on warning time
C021 to C025: Terminal [11] to [15]
functions
C026: Alarm relay terminal function
d016: Cumulative operation RUN time
monitoring
d017: Cumulative power-on time monitoring
Related code
A044/A244/A344: V/F characteristic
curve selection, 1st/2nd/3rd motors
C021 to C025: Terminal [11] to [15]
functions
C063: Zero speed detection level
This signal function applies to the inverter output frequency when the V/F characteristic curve selection is
based on the constant torque characteristic (VC), reduced-torque characteristic (1.7th power of VP), free
V/f characteristic, sensorless vector control, or 0Hz-range sensorless vector control. It applies to the motor
speed when the V/F characteristic curve selection is based on the vector control with sensor.
Item Function code Data or range of data Description
Terminal function
C021 to C025
21 ZS: 0 Hz speed detection signal
Alarm relay terminal function
C026
Setting of the frequency to be
Zero speed detection level C063 0.00 to 100.0 (Hz)
determined as 0 Hz
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