3 After removing an old battery, install a new battery.
4 Press in the battery harness and attach the battery cover.
Precautions for Safe Use
• Before you replace the Battery, you must first supply power to the Controller for at least 5 mi-
nutes, and then you must complete this procedure within 5 minutes at 25°C after turning OFF
the power to the CPU Unit to ensure memory backup. If power is not supplied for at least 5 mi-
nutes, the retained clock data may be lost.
• Never short-circuit the battery terminals; never charge the battery; never disassemble the bat-
tery; and never heat or incinerate the battery
. Doing any of these may cause the battery to leak,
heat, ignite, or rupture.
• Never use a battery that has been dropped on the floor or otherwise subject to shock. It may
leak.
Precautions for Correct Use
Turn ON the power after replacing the battery for a CPU Unit that has been unused for a long time.
Leaving the CPU Unit unused again without turning ON the power even once after the Battery is
replaced may result in a shorter Battery life.
Additional Information
The Low Battery Voltage
event is cleared automatically the next time the Controller is turned ON
after replacing the Battery.
Battery Service Life and Replacement Period
The service life of a battery is five years. Generally, the service life of a battery varies depending on
the ambient temperature and the power ON time rate. The NX1P2 CPU Unit
, due to low power con-
sumption, ensures a battery life of 60 months (five years), which is equivalent to the battery service
life.
Make a plan to replace the Battery so that the service life of the Battery will not exceed the minimum
lifetime under the normal product usage condition.
The Battery service life when power ON time rate is 0% (i.e., power OFF)
Unit model number
Approx. minimum lifetime [month]
*1
25°C 40°C 55°C
NX1P2-£££££££
60
*1. This is the life expectancy which Omron guarantees, based on the calculation worst value of the part's specification of the
product.
Low Battery Indicators
If the Controller Setup has been set to detect a low-battery error, the ERROR indicator on the front of
the CPU Unit will flash when the battery is nearly discharged.
If the ERROR indicator flashes, connect the Sysmac Studio, and then check the CPU Unit’s Battery
connection if the Sysmac Studio shows a Low Battery V
oltage or Real-Time Clock Stopped event. If
the Battery is properly connected, replace the Battery with a new one as soon as possible.
7 Inspection and Maintenance
7-7
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
7-2 Replacing the Battery
7
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