Omron NJ501-1 Series User Manual page 240

6 Inspection and Maintenance
Replacement Procedure
Use the following procedure to replace the battery when the previous battery has become completely
discharged.
Precautions for Safe Use
We recommend replacing the battery with the power OFF to prevent the CPU Unit's sensitive
internal components from being damaged by static electricity. The battery can be replaced with-
out turning OFF the power supply. To do so, always touch a grounded piece of metal to discharge
static electricity from your body before starting the procedure.
After replacing the Battery, connect the Sysmac Studio and clear the Low Battery Voltage event.
1
Turn OFF the power supply to the Controller.
If the CPU Unit has not been ON, turn it ON for at least five minutes and then turn it OFF.
Additional Information
If power is not turned ON for at least five minutes before replacing the battery, the capacitor that
backs up memory when the battery is removed will not be fully charged and memory may be lost
before the new battery is inserted.
2
Open the compartment on the upper left of the CPU Unit and carefully draw out the battery.
Precautions for Safe Use
• Before you replace the Battery, you must first supply power to the Controller for at least 5 min-
utes, and then you must complete this procedure within five minutes at 25C after turning OFF
the power to the CPU Unit to ensure memory backup.
• 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.
• UL standards require that batteries be replaced by experienced technicians. Always place an
experienced technician in charge or battery replacement.
• 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.
6-6 NJ-series CPU Unit Hardware User's Manual (W500)