Lg Electronics 120S 사용자 설명서
Chapter 10 Maintenance
10-1
Chapter 10 Maintenance
Be sure to perform daily and periodic maintenance and inspection in order to maintain the PLC in the best conditions.
10.1 Maintenance 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
Humidity
5 ~ 95%RH
Adjust the operating temperature and humidity with the
defined range.
defined range.
Ambient
environment
environment
Vibration
No vibration
Use vibration resisting rubber or the vibration prevention
method.
method.
Play of modules
No play allowed
Securely enrage the hook.
Connecting conditions of
terminal screws
No loose allowed
Retighten terminal screws.
Change rate of input voltage
− 15% to 10%
Hold it with the allowable range.
Spare parts
Check the number of
Spare parts and their
Store conditions
Spare parts and their
Store conditions
Cover the shortage and improve the conditions
10.2 Daily Inspection
The following table shows the inspection and items which are to be checked daily.
Check Items
Check Points
Judgement
Corrective
Actions
check for loose mounting screws
Screws should not be loose
Retighten
Screws
Screws
Connecting conditions
of terminal block or
extension cable
of terminal block or
extension cable
Check the distance between solderless
terminals
terminals
Proper clearance should be provided
Correct
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
ERR LED
Check that the LED is OFF during Run
OFF(ON indicates an error)
See chapter 11
Input LED
Check that the LEO turns ON and OFF
ON when input is ON,
OFF when input is off
OFF when input is off
See chapter 11
LED
status
status
Output LED Check that the LEO turns ON and OFF
ON when output is ON,
OFF when output is off
OFF when output is off
See chapter 11