Daily Inspection; Cleaning; Periodic Inspection; Periodic Function Test For Safety Function (Sto) - Hitachi WJ Series User Manual

Chapter 16
16.1.1

Daily Inspection

 Check that the following abnormalities are not observed during operation.
No.
1 Motor operation is not abnormal.
2 There is no abnormality in the environment where the device is installed.
3 There is no abnormality in the cooling system.
4 No abnormal vibration or sound is observed.
5 No abnormal overheat or discoloration is observed.
6 No abnormal smell is observed.
 While the inverter is running, check the input voltage of inverter using a multimeter, etc.
No.
1 There is no frequent occurrence of variation of power supply voltage.
2 Three-phase AC voltage keeps a good balance.
16.1.2

Cleaning

 Keep the inverter in a clean condition.
No.
When cleaning the inverter, use a soft cloth soaked in neutral detergent to gently wipe up
1
the dirtied parts.
Do not use solvents such as acetone, benzene, toluene, or alcohol as they may melt the
2
surface or strip the coating of the inverter.
3 Do not use detergents or alcoholic cleaners to clean the keypad displays.
16.1.3

Periodic Inspection

 Check sections that cannot be inspected unless operation is stopped and sections requiring
periodic inspection.
 Please contact your supplier or local Hitachi inverter sales office for periodic inspection.
No.
1 Check that there is no abnormality in the cooling system and clean the air filter, etc.
Check the tightness and retighten if necessary.
2
Due to effects of vibration or temperature change, tightened portions of screws or bolts
may loosen. Make sure to carefully check and perform the work.
3 No corrosion or damage is observed on the conductors and insulators.
4 Measurement of insulation resistance
5 Checking and replacing the cooling fan, smoothing capacitor, and relay
16.1.4

Periodic Function Test for Safety Function (STO)

 When handling the WJ-C1 as a functional safety certified product, be sure to perform the
following items. For details, refer to the separate volume "WJ series C1 Safety Function Guide
(NT3612*X)".
 A periodical STO functional test must be performed at least once in a year to maintain the
intended safety performance level of the STO function. This periodical STO function test is one
of the conditions for the STO function of WJ-C1 to meet PL e of ISO13849-1 and SIL 3 of
IEC61800-5-2.
Maintenance and Inspection
Description
Description
Description
Description
16-1-2
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