Periodic Inspection - YASKAWA CIMR-MX1S Instructions Manual

Periodic Inspection

Check the following items during periodic inspections.
Turn off the medium-voltage power supply, make sure that all LEDs on the front cover of the cell control
board are unlit, and then wait at least 15 minutes before starting inspection.
Touching terminals immediately after turning off the power supply may result in electric shock.
Location
Transformer
Panel,
Power Cell
Panel
Control Panel
Cooling system Cooling fan
-4
8
Table 8.2 Periodic Inspections (Once per Year)
Item
Megger check between the main circuit terminals and ground terminal
Entire Transformer
Check for loose screws, bolts, or connectors.
and Power Cell
Check for trace of overheat on each part.
Panels
Clean inside the panels.
Wires Check for damage or deterioration of cable sheath.
Transformer Confirm primary/secondary voltages are normal.
Check for leakage from the smoothing capacitor for snubber.
Confirm the safety valve of the smoothing capacitor for snubber is not protruding.
Confirm the smoothing capacitor for snubber has not expanded.
Measure the capacitance of the smoothing capacitor for snubber. (The measured
Power cells
capacitance must be at least 80% of the rating.)
Check for loose screws or bolts.
Confirm if the main circuit and control circuit fuses are normal.
Check for accumulated dust and dirt on the heat sink.
Operation Confirm no abnormalities in protective and indication circuits
Confirm smooth operation
Relays Confirm timer operation.
Check for damaged contacts.
Check for abnormal smells and discoloration.
Board
Confirm the power supply voltage.
Check for abnormal vibration and noise.
Confirm the bearing operation.
Inspection