7-11
7 Inspection and Maintenance
CJ2 CPU Unit Hardware User’s Manual
7-3 Power Supply Unit Replacement Time
7
z Replacement Notification Function Displays
The replacement notification of the Power Supply Unit is shown using three 7-segment display char-
acters.
• At time of purchase “FUL” is displayed. The display changes to “HLF” as the electrolytic capacitor
deteriorates (“HLF” may not be displayed, depending on the operating environment).
• When the time until replacement is required drops below 2 years, the display will change corre-
sponding to the operating time from “1.5” to “1.0” to “0.5” to “0.0”/”A02.” When the remaining ser-
vice life reaches 6 months or less, the display will alternate between “0.0” and “A02” in 2-second
intervals.
Note 1 The time remaining until replacement does not include periods when the power is turned OFF.
2 Until approximately one month of operating time has accumulated, the display will always be “ful” and the
alarm output will remain ON (conducting) due to the estimated deterioration speed.
3 The time remaining until replacement will vary the operating and storage conditions, so periodically check
the display.
4 Fluctuation in the time remaining until replacement may result in the alarm output repeatedly turning ON
and OFF.
5 The precision of the replacement notification function will be adversely affected by applications in which
the power is frequently turned ON and OFF.
6 Due to the service life of the electronic components, replace the Power Supply Unit approximately 15
years after purchase, even if the replacement notification display or output has not indicated that replace-
ment is required.
z Alarm Output (Replacement Notification Output)
The output remains ON until the remaining service life drops below 6 months and then turns OFF.
Note The alarm output will also turn OFF under the following conditions.
• The AC input to the Power Supply Unit is turned OFF.
• An error is detected by the self-diagnostic function.
• The TEST switch is pressed for at least 3 seconds.
Function
Capacity at
time of
manufacture
Replacement
required
Electrolytic
capacitor level
Replacement notification
display (7-Segment)
2.0 yr 1.5 yr 1.0 yr
0 yr
Remaining
life span
Alarm output
(replacement notification output)
Output ON
Output
OFF
The output turns OFF when the remaining
life span reaches 6 months, and the
following display is repeatedly alternated.
0.5 yr
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