216
7-3. Maintenance
7-3. Maintenance
Although programmable controllers have been designed in such a way to minimize maintenance and offer trouble-
free operation, several maintenance aspects should be taken into consideration. If preventive maintenance is
performed periodically, you will minimize the possibility of system malfunctions.
1. Preventive Maintenance
2. Replacement of Backup Battery
1) Battery Life
• When the voltage of the backup battery lowers, special internal relays R9005 and R9006 turn ON and the ERR.
LED turns ON. Replace the backup battery within a month after this battery error is detected.
Caution:
• Never throw batteries into a fire. Do not dispose of them in trash that will be incinerated.
Control Units
C24, C40, C56, and
C72 standard types
C24C, C40C, C56C,
and C72C types
Battery life (at 25˚C/77˚F ambient temperature)
Approx. 53,000 hours (approx. 6 years)
Approx. 27,000 hours (approx. 3 years)
Item
Power supply voltage
Environment
I/O power supply voltage
Mounting condition
Backup battery
Check point
Check the power supply condition by
measuring it at the power supply
terminals of the programmable controller.
Ambient temperature
(e.g., temperature in the control box)
Ambient humidity
(e.g., humidity in the control box)
Is dirt and dust present?
Measure the operating voltage
at the input/output terminals.
Are all of the units firmly fixed in place?
Are all the terminal screws securely
tightened?
Are wiring and terminals being properly kept?
Is the backup battery being periodically
replaced?
•
•
•
•
•
•
•
•
•
Criteria for judgement
AC type:
85 V AC to 264 V AC
DC type:
20.4 V DC to 26.4 V DC
Ambient temperature:
0˚C to 55˚C/32˚F to 131˚F
Ambient humidity:
30 % to 85 % RH
(no condensation)
Refer to page 43.
Refer to the following.
(Part number: AFP1801)
Summary of Contents for FP1
Page 1: ...PROGRAMMABLE CONTROLLER FP1 is a global brand name of Matsushita Electric Works Hardware ...
Page 28: ...20 ...
Page 98: ...90 ...
Page 150: ...142 ...
Page 208: ...200 ...
Page 226: ...218 ...
Page 280: ...272 ...