LG Electronics 120S user manual Periodic Inspection, 10-2

Chapter 10 Maintenance

10.3Periodic Inspection

Check the following items once or twice every six months, and perform the needed corrective actions.

	Check Items				Checking		Methods		Judgment
			Ambient					0 ~ 55 °C
			temperature	-. Measure with thermometer and
Ambient
			Ambient Humidity	hygrometer				5 ~ 95%RH
Environment
				-. measure corrosive gas
			Ambience					There should be no
								corrosive gases
			Looseness, Ingress	The	module should be move			The module should be
PLC				the	unit			mounted securely.
Conditions
			dust or foreign	Visual		check		No dust or foreign material
			material
			Loose terminal	Re-tighten screws				Screws	should not		be loose
			screws
Connecting			Distance between	Visual		check		Proper	clearance
			terminals
conditions
			Loose connectors	Visual		check		Connectors		should	not be
								loose.
Line		voltage check		Measure voltage			between input	*85 ~ 264V AC
				terminals				*20~28V DC
			Fuse	Visual		check		No melting		disconnection

Corrective Actions

Adjust to general standard

(Internal environmental standard of control section)

Retighten screws

Retighten

Correct

Retighten connector mounting screws

Change supply power

If fuse melting disconnection, change the fuse periodically because a surge current can cause heat

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