Cleveland Range inverter manual Daily and Periodic Inspection Items, Troubleshooting & Maintenance

Chapter 6 - Troubleshooting & Maintenance

6.7 Daily and Periodic Inspection Items

Inspection Location

Inspection Item

Period

Inspection

Daily

year1

year2

Inspection Method

Criterion

Measuring

Instrument

Ambient

Is there any dust?

Refer to the precautions

Temperature:

Thermometer,

Is the ambient temperature and

-10~+40 no

Hygrometer,

Environ-

humidity adequate?

Ο

freezing.

Recorder

ment

Humidity: Under

All

90% no dew

Equipment

Is there any abnormal oscillation

Ο

Use sight and hearing

No abnormality

or noise

Input

Is the input voltage of the main

Ο

Measure the voltage between

Digital Multi-

Voltage

circuit normal

the terminals R, S, T

Meter/Tester

Megger check (between the main

Ο

Undo the inverter connections

Over 5MΩ

DC 500V

circuit and the ground)

short the terminals R, S, T, U,

No fault

class Megger

All

Are any fixed parts removed?

Ο

Ο

V, W and measure between

Are there any traces of

Ο

these parts and the ground.

overheating at each component’s

Tighten the screws.

cleaning?

Visual check.

Conductor/

Is the conductor rusty?

Ο

Visual check

No fault

Wire

Is the wire coating damaged?

Ο

Terminal

Is there any damage?

Ο

Visual check

No fault

IGBT

Check the resistance between

Ο

Undo the inverter connection

(Refer ‘How to

Digital Multi-

Module

each of the terminals.

and measure the resistance

Check Power

Meter/Analog

Circuit

/Diode

between R, S, T ⇔ P, N and

Components”)

Tester

Module

U, V, W ⇔ P, N with a tester.

Main

Is there any liquid coming out?

Ο

Visual check.

No fault

Capacitance

Smoothing

Is the safety pin out, and is there

Ο

Measure with a capacitance-

Over 85% of the

Measuring

Capacitor

any swelling?

measuring device.

rated capacity

Device

Measure the capacitance.

Ο

Is there any chattering noise

Ο

Auditory check.

No fault

Relay

during operation?

Is there any damage to the

Ο

Visual check.

contact

Is there any damage to the

Ο

Visual check.

No fault

Digital Multi-

resistor insulation?

Error must be

Meter/Analog

Resistor

Is the wiring in the resistor

Ο

Disconnect one of the

within ±10%

Tester

damaged (open)?

connections and measure

the displayed

with a tester.

resistance

Is there any unbalance between

Ο

Measure the voltage between

The voltage

Digital Multi-

each phases of the output

the output terminals U, V and

balance between

Meter/Rectifyi

CircuitControl CircuitProtective

voltage?

W.

the phases for

ng Voltmeter

Operation

200V (800V)

Nothing must be wrong with

Ο

Short and open the inverter

class is under

Check

display circuit after executing the

protective circuit output.

4V (8V).

sequence protective operation

The fault circuit

operates

according to the

sequence.

97