3. DAILY MAINTENANCE AND PERIODIC INSPECTION AND MAINTENANCE
3.1 Maintenance Tools
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3. DAILY MAINTENANCE AND PERIODIC INSPECTION AND
MAINTENANCE
3.1 Maintenance Tools
(1) Measuring
instruments
The following measuring instruments are used to confirm that the voltage is being supplied correctly
to the unit, to confirm that the wiring to the unit is correct, and to carry out simple troubleshooting.
Table 3.1 Maintenance tools
Tool Condition
Application
Tester
To check that the wiring to the PLC unit is correct
before turning the power ON.
AC voltmeter
Measure the AC power voltage.
The tolerable error is
±
2% or less.
To measures 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)
Phase rotation
meter
To check the connection order of the AC 3-phase
input power supply.
Synchroscope
General measurement and simple troubleshooting
Note)
Currently, a high-accuracy 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
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