Chapter 10 Maintenance

Chapter 10 Maintenance

Be sure to perform daily and periodic maintenance and inspection in order to maintain the PLC in the best conditions.

10.1Maintenance and Inspection

The I/O module mainly consist of semiconductor devices and its service life is semi-permanent. However, periodic inspection is requested for ambient environment may cause damage to the devices. When inspecting one or two times per six months, check the following items.

 

Check Items

 

 

Judgment

 

 

Corrective Actions

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Temperature

 

 

0 ~ + 55°C

 

 

Adjust the operating temperature and humidity with the

 

 

Ambient

 

 

 

 

 

 

 

defined range.

 

 

 

Humidity

 

 

5 ~ 95%RH

 

 

 

 

environment

 

 

 

 

 

 

 

 

 

 

 

Vibration

 

 

No vibration

 

 

Use vibration resisting rubber or the vibration prevention

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

method.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Play of modules

 

 

 

No play allowed

 

 

Securely enrage the hook.

 

 

 

 

 

 

 

 

 

 

 

Connecting conditions of

 

 

No loose allowed

 

 

Retighten terminal screws.

 

 

terminal screws

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Change rate of input voltage

 

 

15% to 10%

 

 

Hold it with the allowable range.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check the number of

 

 

 

 

 

Spare parts

 

 

 

Spare parts and their

 

 

Cover the shortage and improve the conditions

 

 

 

 

 

 

 

Store conditions

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10.2Daily Inspection

The following table shows the inspection and items which are to be checked daily.

 

 

Check Items

 

 

Check Points

 

 

Judgement

 

 

Corrective

 

 

 

 

 

 

 

 

 

Actions

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Connecting conditions

 

 

check for loose mounting screws

 

Screws should not be loose

 

 

Retighten

 

 

 

 

 

 

 

Screws

 

 

of terminal block or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check the distance between solderless

 

 

 

 

 

 

 

 

extension cable

 

 

 

 

Proper clearance should be provided

 

 

Correct

 

 

 

 

terminals

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PWR LED

 

 

Check that the LED is ON

 

 

ON(OFF indicates an error)

 

See chapter 11

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Run LED

 

Check that the LED is ON during Run

 

ON (flickering indicates an error)

 

See chapter 11

 

 

LED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ERR LED

 

 

Check that the LED is OFF during Run

 

 

OFF(ON indicates an error)

 

See chapter 11

 

 

status

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input LED

 

 

Check that the LEO turns ON and OFF

 

 

ON when input is ON,

 

 

See chapter 11

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF when input is off

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Output LED

 

Check that the LEO turns ON and OFF

 

 

ON when output is ON,

 

 

See chapter 11

 

 

 

 

 

 

 

OFF when output is off

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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LG Electronics 120S user manual Maintenance and Inspection, Daily Inspection, Led Err Led