5. CHECK AND TROUBLESHOOTING
75
General inspection items
Checking
spot
Inspection
Item
Check list
Period
Judgment criteria
Daily
1 year 2 years
All
Environ-
ment
Is there dust around?
Are the ambient temperature and humidity
within the standard ranges?
Is there irregular vibration around?
○
Refer to 1. Environmental
Conditions
Equipment
Is there irregular vibration or noise ?
There should be no problem.
Main/Control circuit
Input
voltage
Is the main circuit's voltage normal?
Is the control circuit's voltage normal?
Refer to 1. Environmental
Conditions
Insulation
resistance
test
Interrupt all power before conducting the insula-
tion resistance test.
Insulate transformer’s 1st phase unit from
grounding bus-bar. When measuring resistance,
disconnect all grounding wires connected to the
grounding bus-bar.
*Low-voltage (600Vac or below)
DC 500V megger test, 5M
Ω
or above
*High-voltage (above 600Vac 7000Vac)
DC 1000V megger test,
30M
Ω
or above
Superheating Is there an superheat mark in any component?
There should be no problem.
Fixed parts
Is there any fixed part missed?
There should be no problem.
Conductors
/Wires
Is there any contamination in conductors?
Is there any damage in wires?
There should be no problem.
Terminal bars Is there any parts damaged?
There should be no problem.
Relays
/Contactors
Is there any vibration during operation?
Is there any damage in contactor?
There should be no problem.
Space
heater
Is there any discoloration in heater element
(starter panel)?
There should be no problem.
Sensors
/Switches
Is there any disconnected or short-circuit wires?
Is there any damage in contacts?
There should be no problem.
Grounding
Is there any rust in the connection parts?
Is there any damage in the grounding conductor?
Is there any noise in the grounding system?
Note: Grounding resistance should be within the
specified range of the code and regulation.
There should be no problem.
Phase
advanced
capacitor
Is there any damaged part?
Is the swelling under the allowable limit?
There should be no problem.
Cooling fan
Is there any irregular noise?(Control panel)
There should be no problem.
Control func-
tion
Safety
function
Does the safety function work normally?
Does the startup sequence work normally?
Does the stop sequence work normally?
Is the extent of temperature control within the
specified limits?
Normal control
Display
Analog
value
Are the displayed values accurate?
Should be within the al-
lowed range
Indication
lamps
Do the indication lamps have the normal bright-
ness?
Lamp should be ON during
operation
ENGLISH
Table 9 General inspection items
Summary of Contents for LCWW
Page 119: ......
