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4. DAILY MAINTENANCE AND PERIODIC INSPECTION AND MAINTENANCE
4.1 Maintenance Tools
II - 23
4. DAILY MAINTENANCE AND PERIODIC INSPECTION AND
MAINTENANCE
4.1 Maintenance Tools
(1) Measuring instruments
The following measuring instruments are used to confirm that the voltage is being supplied correctly
to the NC unit, to confirm that the wiring to the NC unit is correct, and to carry out simple
troubleshooting.
Table 2.1 Maintenance tools
Tool Condition Application
Tester To check that the wiring to the NC unit is correct
before turning the power ON.
AC voltmeter Measure the AC power voltage.
The tolerable error is ±2%
or less.
To measure the AC power voltage being
supplied to the external 24VDC power supply
unit.
DC voltmeter Max. scale 30V.
The tolerable error is ±2%
or less.
To measure the DC power voltage.
External power supply 24V (control section,
machine input/output interface)
Battery voltage
HR851 SA output
Synchroscope General measurement and simple
troubleshooting
Note 1) Currently, a high precision digital multi-meter is commonly used as a tester. This digital
multi-meter can be used as both an AC voltmeter and a DC voltmeter.
(2) Tools
Screwdriver (large, medium, small)
Radio pliers
4.2 Maintenance Items
Maintenance is categorized into daily maintenance items (items to be carried at set intervals) and
periodic maintenance (replacement of parts when life is reached).
Some parts will not function in a hardware manner when the life is reached, so these should be
replaced before the life is reached.
Table 2.2 List of maintenance items
Class Name Life Inspection/replacement Remarks
Daily
maintenance
Escutcheon
(when using
communication
terminal)
Once/two months
(Accordingly when dirty)
Refer to
section 4.2.1.
Periodic
maintenance
Battery
(lithium battery)
Cumulative data
holding time
45,000h
When battery drop
caution alarm occurs
(Guideline: approx. 5
years)
Refer to
section
4.3.2 (1).
Cooling fan
(control section)
30,000h Refer to left. Refer to
section
4.3.2 (2).
LCD display unit
(when using
communication
terminal)
10,000h
(Specified by the
power ON time that
the brightness drops
to less than 50%.)
Replace when backlight
darkens.
Refer to
section 4.2.2.