Mitsubishi Electric F700 Instruction Manual download pdf (Page 85)

80

Inspection Item

6.1.3 Daily and periodic inspection

Area of

Inspection

Inspection

Item

Inspection Item

Interval

Method Criterion

Instrument

Customer's

check

Daily

Periodic*

1 years

2 years

General

Surrounding

environment

Check ambient

temperature, humidity,

dust, dirt, etc.



Measure 5cm away

from the inverter.

(Refer to page 7.)

Ambient

temperature:

-10°C to +50°C ,

non-freezing.

Ambient humidity:

90% or less, non-

condensing.

Thermometer,

hygrometer,

recorder

Overall

unit

Check for unusual

vibration and noise.



Visual and auditory

checks.

No fault

Power

supply

voltage

Check that the main

circuit voltages are

normal.



Measure voltages

across inverter terminal

block R/L1, S/L2, T/L3

phases.

Within permissible

AC (DC) voltage

fluctuation

(Refer to page 91.)

Teste r,

digital

multimeter

Main

circuit

General

(1) Check with megger

(across main circuit

terminals and earth

(ground) terminal)



(1) Disconnect all

cables from the

inverter and

measure across

terminals R/L1, S/

L2, T/L3, U, V, W

and earth terminal

with megger. (Refer

to page 89.)

(2) Retighten.

(3) Visual check

(1)

5MΩ or more.

(2)(3)

No fault

500VDC

class

megger

(2) Check for loose

screws and bolts.



(3) Check for overheat

traces on the parts.



(4) Clean. 

Conductors,

cables

(1) Check conductors

for distortion.



(1)(2)

Visual check

(1)(2)

No fault

(2)

Check cable sheaths

for breakage



Terminal

block

Check for damage.  Visual check No fault

Inverter

module,

Converter

module

Check resistance

across terminals.



Disconnect all cables

from the inverter and

measure across

terminals R/L1, S/L2, T/

L3, P/+, N/− and U, V,

W, P/+, N/− with a meter

range of 100Ω.

(Refer to page 83)

Analog

tester

Relay

(1) Check for chatter

during operation.



(1) Auditory check.

(2) Visual check

(3) Judge by the inrush

current limit circuit

and the life check of

the relay.

(1)(2) No fault

(2) Check for rough

surface on

contacts.



Smoothing

capacitors

Check for fluid leakage

and crack.



Visual check and judge

by the life check of the

main circuit capacitor.

Control

circuit

Protective

circuit

Operation

check

(1) Check balance of

output voltages

across phases with

the inverter

operated alone.



(1) Measure voltages

across the inverter

output terminals U-

V-W.

(2) Simulatively short or

open the protective

circuit output

terminals of the

inverter.

(1) Phase to phase

voltage balance

is within 4V for

the 200V and

within 8V for the

400V

(2) Fault must occur

because of

sequence.

Digital

multimeter,

rectifier

type

voltmeter

(2) Perform sequence

protective

operation test to

ensure no fault in

protective and

display circuits.



Smoothing

capacitors

Check for fluid leakage

and clack.



Visual check and judge

by the life of the main

circuit capacitor. (Refer

to page 81.)

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