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Maintenance of the NT31/NT31C Section 7-3
The battery life is about 5 years if the NT31/NT31C is used in a location where
the ambient temperature is 25
°C. If the temperature at the location of use is
higher than this, the battery life will be shorter. Change the battery at suitable
intervals in accordance with the operating environment of the NT31/NT31C.
It is advisable to keep a spare battery so that the battery can be replaced
immediately when replacement becomes necessary.
Battery Type
3G2A9-BAT08 (for both NT31 and NT31C)
Guide to Replacement
Replace the Battery in the following cases.
If the power supply to the PT is left turned OFF after a low battery voltage has
been detected, the memory backed up by the battery may be corrupted.
Replace the Battery within 5 minutes of turning OFF the power supply to the
PT.
• When 5 years have passed since the installation of a new battery.
• When the RUN LED is lit in orange (during operation) or in red (when
stopped).
• When the message The voltage is lowered. is displayed on switching on
the power or resetting the NT31/NT31C.
• When The voltage is lowered is displayed in the Battery check in the bat-
tery check menu of the Maintenance mode.
Battery Replacement Method
Replace the battery by following the procedure given below.
To protect the contents of the memory, the battery must be replaced within 5
minutes.
Procedure
1,2,3... 1. Keep the power ON for at least 5 minutes and then turn it OFF.
Reference: Unless the power is kept ON for at least 5 minutes, the memory contents can-
not be retained for more than 5 minutes without a battery.
2. Insert a flat blade screwdriver at the top of the battery cover located at the
left of the rear face of the NT31/NT31C and pull it toward you.
3. Remove the battery that is secured under the battery cover, grip the cable,
and pull the connector straight out.
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