PROTECTIVE FUNCTIONS

Daily and Periodic Inspection

Area of

 

 

 

Interval

 

 

 

 

Inspection

 

 

 

Periodic

 

 

 

Inspec-

Description

 

 

Method

Criterion

Instrument

Item

Daily

 

1

2

tion

 

 

 

 

 

 

 

 

 

 

year

years

 

 

 

 

 

 

 

 

 

 

Disconnect cables

 

 

 

 

 

 

 

 

 

from inverter and

 

 

 

Inverter

 

 

 

 

 

measure across

 

 

 

module,

Check resistance

 

 

 

¡

terminals R, S, T, P, N

(See the following

Analog tester

 

Converter

across terminals.

 

 

 

 

and U, V, W, P, N <L1,

pages)

 

 

module

 

 

 

 

 

L2, L3, +, -, and U, V,

 

 

 

 

 

 

 

 

 

W, +, -> with tester

 

 

 

 

 

 

 

 

 

range of 100Ω.

 

 

 

 

(1) Check for liquid

¡

 

 

 

(1), (2) Visual check.

(1), (2) No fault.

 

 

 

leakage.

 

 

 

 

(3) Measure with

(3) 85% or more

 

 

 

(2) Check for safety

¡

 

 

 

capacity meter.

of rated capacity.

 

 

Smoothing

valve projection

 

 

 

 

 

 

Capacity

 

capacitor

and bulge.

 

 

 

 

 

 

meter

Main

 

(3) Measure

 

 

¡

 

 

 

 

circuit

 

electrostatic

 

 

 

 

 

 

 

 

 

capacity.

 

 

 

 

 

 

 

 

 

(1) Check for chatter

 

 

¡

 

(1) Auditory check.

(1) No fault.

 

 

 

during operation.

 

 

 

 

(2) Visual check.

(2) No fault.

 

 

Relay

(2) Check for rough

 

 

¡

 

 

 

 

 

 

surface on

 

 

 

 

 

 

 

 

 

contacts.

 

 

 

 

 

 

 

 

 

(1) Check for crack in

 

 

¡

 

(1) Visual check.

(1) No fault.

 

 

 

resistor insulation.

 

 

 

 

Cement resistor,

(2) Error should

 

 

 

(2) Check for open

 

 

¡

 

wire-wound

be within

Tester, digital

 

Resistor

cable.

 

 

 

 

resistor.

±10% of

 

 

 

 

 

multimeter

 

 

 

 

 

 

 

(2) Disconnect one

indicated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

end and measure

resistance

 

 

 

 

 

 

 

 

with tester.

value.

 

 

 

(1) Check balance of

 

 

¡

 

(1) Measure voltage

(1) Phase-to-

 

 

 

output voltages

 

 

 

 

across inverter

phase voltage

 

 

 

across phases

 

 

 

 

output terminals U-

balance within

 

 

 

with inverter

 

 

 

 

V-W.

8V for 400V.

 

Control

 

operated

 

 

 

 

(2) Simulatively

(2) Fault must

Digital

circuit

Operation

independently.

 

 

¡

 

connect or

occur

multimeter,

Protective

check

(2) Perform sequence

 

 

 

 

disconnect

because of

rectifier type

circuit

 

protective operation

 

 

 

 

inverter protective

sequence.

voltmeter

 

 

test to make sure of

 

 

 

 

circuit output

 

 

 

 

no fault in

 

 

 

 

terminals.

 

 

 

 

protective and

 

 

 

 

 

 

 

 

 

display circuits.

 

 

 

 

 

 

 

 

 

(1) Check for unusual

¡

 

 

 

(1) Turn by hand with

(1) Smooth

 

 

Cooling fan

vibration and noise.

 

 

 

 

power off.

rotation.

 

 

(2) Check for loose

 

 

¡

 

(2) Re-tighten

(2) No fault.

 

Cooling

 

 

 

 

 

 

connection.

 

 

 

 

 

 

 

system

 

 

 

 

 

 

 

 

Cooling fan

Is the power supply's

 

 

 

 

Measure with a

 

 

 

 

 

 

 

 

 

 

power

 

 

¡

 

24V±2.4V

Tester

 

output voltage correct?

 

 

 

tester.

 

supply

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1) Check if LED lamp

¡

 

 

 

(1) Light indicator

(1) Check that

 

 

Display

is blown.

 

 

 

 

lamps on panel.

lamps are lit.

 

Display

 

(2) Clean.

 

 

¡

 

(2) Clean with rag.

 

 

 

Check that reading is

¡

 

 

 

Check reading of

Must satisfy

 

 

Meter

normal.

 

 

 

 

meters on panel.

specified and

Voltmeter,

 

 

 

 

 

 

 

management

ammeter, etc.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

values.

 

 

 

(1) Check for unusual

¡

 

 

 

(1) Auditory, sensory,

(1), (2) No fault.

 

 

 

vibration and noise.

 

 

 

 

visual checks.

 

 

 

General

(2) Check for unusual

¡

 

 

 

(2) Check for unusual

 

 

 

odor.

 

 

 

 

odor due to

 

 

 

 

 

 

 

 

 

 

Motor

 

 

 

 

 

 

overheating,

 

 

 

 

 

 

 

 

damage, etc.

 

 

 

 

 

 

 

 

 

 

 

 

 

(1) Check with megger

 

 

 

¡

(1) Disconnect cables

(1) 5M Ω or more

 

 

Insulation

(across terminals

 

 

 

 

from U, V, W,

 

500V megger

 

resistance

and ground

 

 

 

 

including motor

 

 

 

 

 

 

 

 

 

 

terminal).

 

 

 

 

cables.

 

 

36

Page 47
Image 47
Mitsubishi Electronics FR-A500L instruction manual Daily and Periodic Inspection