Mitsubishi Electric FR-E540 Instruction Manual download pdf (Page 192)

PROTECTIVE FUNCTIONS

178

Interval

Periodic

*

Area of

Inspec-

tion

Inspection

Item

Description

Daily

1

year

2

years

Method Crlterlon Instrument

Inverter

module,

Converter

module

Check resistance

across terminals.

$

Disconnect cables

from inverter and

measure across

terminals R, S, T,

↔

P, N and U, V, W,

↔

P, N

〈

L

1

, L

2

, L

3

↔

+

,

−

and U, V, W,

↔

+

,

−〉

with a meter range of

100

Ω

.

(Refer to page 179) Analog meter

Relay

(1) Check for chatter

during operation.

(2) Check for rough

surface on contacts.

$

$

(1) Auditory check.

(2) Visual check.

(1) No fault.

(2) No fault.

Main

circuit

Resistor

(1) Check for crack in

resistor insulation.

(2) Check for open

cable.

$

$

(1) Visual check.

Cement resistor,

wire-wound

resistor.

(2) Disconnect one

end and measure

with a meter.

(1) No fault.

(2) Error should

be within

±

10%

of indicated

resistance

value.

Meter, digital

multimeter

Control

circuit

Protec-

tive circuit

Operation

check

(1) Check balance of

output voltages

across phases with

inverter operated

independently.

(2) Perform sequence

protective operation

test to make sure of

no fault in protective

and display circuits.

$

$

(1) Measure voltage

across inverter

output terminals U-

V-W.

(2) Simulatively

connect or

disconnect inverter

protective circuit

output terminals.

(1) Phase-to-

phase voltage

balance within

4V(8V) for

200V(400V).

(2) Fault must

occur because

of sequence.

Digital

multimeter,

rectifier type

voltmeter

Cooling

system

Cooling fan

(1) Check for unusual

vibration and noise.

(2) Check for loose

connection.

$

$

(1) Turn by hand with

power off.

(2) Visual check

No unusual

vibration, unusual

noise.

Display

(1) Check if LED lamp

is blown.

(2) Clean.

$

$

(1) Light indicator

lamps on panel.

(2) Clean with rag.

(1) Check that

lamps are lit.

Display

Meter

Check that reading is

normal.

$

Check reading of

meters on panel.

Must satisfy

specified and

management

values.

Voltmeter,

ammeter, etc.

General

(1) Check for unusual

vibration and noise.

(2) Check for unusual

odor.

$

$

(1) Auditory, sensory,

visual checks.

(2) Check for unusual

odor due to

overheating,

damage, etc.

(1), (2) No fault.

Motor

Insulation

resistance

Check with megger

(across terminals and

ground terminal).

$

Disconnect cables

from U, V, W,

including motor

cables.

5M

Ω

or more 500V megger

Note: Values in parentheses are those of the 400V class.

*For periodic inspection, consult Mitsubishi.

5

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