4 Installation and Wiring
4-4
NJ-series CPU Unit Hardware User’s Manual (W500)
The following table gives the voltage conditions for a power interruption.
The setting ranges for the power OFF detection time are given in the following table.
Execution of the user program is ended if a power interruption exceeds the power OFF detection time,
as shown below. The processing after power interruption confirmation (described below) is performed,
and then the system (i.e., CPU Unit) stops.
As shown in the following figure, the system (i.e. CPU Unit) will stop even if the voltage recovers after
the power interruption detection time.
Power interruption detection time: The time from when the input power supply voltage drops
until a power interruption is detected. The power interrup-
tion is detected by the Power Supply Unit.
Power interruption detection delay time: The standby time from when the Power Supply Unit
detects the power interruption until the CPU Unit starts
processing after the power interruption is confirmed.
Power OFF detection time: The time from when the power supply voltage drops until
the CPU Unit starts processing after the power interruption
is confirmed. The CPU Unit continues to operate normally
until the power interruption is confirmed.
Power Supply Unit model Power supply input Power interruption voltage
NJ-PA3001 100 to 200 VAC 85 VAC max.
NJ-PD3001 24 VDC 19.2 VDC max.
Power supply type Power OFF detection time
AC power supply 30.5 to 45.5 ms
DC power supply 22.5 to 25.5 ms
Operation at Power OFF Operation
Power supply type Time required for a power interruption
AC power supply 45.5 ms or longer
DC power supply 25.5 ms or longer
System reset
Voltage drop
Power interruption
detected.
Executing user program
Processing after power interruption is confirmed
AC: 85 V max.
DC: 19.2 V max.
Power interruption
confirmed.
System stops.
(CPU Unit stops.)
Power OFF detection time
AC: 30.5 to 45.5 ms
DC: 22.5 to 25.5 ms
Power interruption
detection time
AC: 10 to 25 ms
DC: 2 to 5 ms
Power interruption
detection delay time:
20.5 ms (fixed)
System reset
Voltage drop
Power interruption
detected.
Executing user program
AC: 85 V max.
DC: 19.2 V max.
Power interruption
confirmed.
System stops.
(CPU Unit stops.)
Power OFF detection time
AC: 30.5 to 45.5 ms
DC: 22.5 to 25.5 ms
Power interruption
detection time
AC: 10 to 25 ms
DC: 2 to 5 ms
Power interruption
detection delay time:
20.5 ms (fixed)
Voltage recovery
disabled.
Processing after power interruption is confirmed
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