E6581090

14.2Periodical inspection

Make a periodical inspection at intervals of 3 or 6 months depending on the operating conditions.

Danger

Before inspection, perform the following steps.

 

Shut off all input power to the inverter.

Mandatory

Wait for at least 15 minutes and check that the charge lamp is no longer lit.

 

Use a tester that can measure DC voltages (800V DC or more), and check that the

 

voltage to the DC main circuits (across PA-PC) does not exceed 45V.

 

Performing an inspection without carrying out these steps first could lead to electric shock.

Never replace any part.

This could be a cause of electric shock, fire or bodily injury. To replace parts, call the local

Prohibited

sales agency.

Check items

1.

Check to see if all screwed terminals are tightened firmly.

If any screw is found loose, tighten it

 

 

again with a screwdriver.

 

2.

Check to see if all crimped terminals are fixed properly.

Check them visually to see that there

 

 

is no trace of overheating around any of them.

 

3.

Check visually all cables and wires for damage.

 

4.

With a vacuum cleaner, remove dirt and dust, especially from the vents and the printed circuit

 

 

boards. Always keep them clean to prevent an accident due to dirt or dust.

5.

When leaving the inverter unused for a long time, check it for functioning once every 2 years or

 

 

so by supplying it with electricity for at least 5 hours with the motor disconnected. It is

 

 

advisable not to supply the commercial power directly to the inverter but to gradually increase

 

 

the power supply voltage with a transformer.

 

6.

If the need arises, conduct an insulation test on the main circuit terminal board only, using a

 

 

500V insulation tester. Never conduct an insulation test on control terminals other than

 

 

terminals on the printed circuit board or on control terminals. When testing the motor for

 

 

insulation performance, separate it from the inverter in advance by disconnecting the cables

 

 

from the inverter output terminals U, V and W. When conducting an insulation test on

 

 

peripheral circuits other than the motor circuit, disconnect all cables from the inverter so that no

 

 

voltage is applied to the inverter during the test.

 

14

 

 

 

(Note) Before an insulation test, always disconnect all cables from the main circuit terminal board

and test the inverter separately from other equipment.

 

 

 

 

 

R/L1

S/L2

T/L3

 

U/T1

V/T2

W/T3

 

 

 

 

 

 

 

 

 

 

 

500V insulation tester (megger)

7.Never test the inverter for pressure. A pressure test may cause damage to its components.

8.Voltage and temperature check

Recommended voltmeter:

 

 

Input side____

Moving-iron type voltmeter

( )

Output side __

Rectifier type voltmeter (

 

 

)

It will be very helpful for detecting a defect if you always measure and record the ambient temperature before, during and after the operation.

N-2

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Toshiba VF-nC1 instruction manual Periodical inspection, Check items