11-8. How to Diagnose Trouble in Outdoor Unit

11-8-1. Summarized Inner Diagnosis of Inverter Assembly

Table 11-8-1

Diagnosis/Process flowchart

Item

Contents

Summary

 

 

 

 

 

 

 

 

 

 

 

 

 

Preparation

Turn “OFF” the power supply

 

 

Remove connector

 

 

 

breaker, and remove 3P

 

 

 

 

 

connector which connects

 

 

of compressor.

 

 

 

inverter and compressor.

 

 

 

 

 

 

 

 

If fuse was blown, be sure to

 

 

 

 

 

 

Check 25A fuse

NG

Check

• Check whether 25A fuse

check the electrolytic

 

(Part No.F01).

 

 

 

on the control board

capacitor and diode block.

 

OK

 

 

 

assembly is blown or not.

(DB01)

 

 

 

 

 

 

 

Replace fuse.

Check

(F01)

• Connect discharge

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

resistance (approx. 100Ω ,

 

 

 

 

 

 

 

 

Check

 

 

40W) or soldering iron

 

 

electrolytic

 

 

(plug) between +, –

 

 

capacitor, diode

 

 

terminals of the electro-

 

 

block (DB01),

 

 

lytic capacitor (760µF) of

 

 

etc.

 

 

 

 

 

 

C14 (with printed CAU-

 

 

 

 

 

 

 

 

 

 

 

 

TION HIGH VOLTAGE) on

 

 

 

 

 

 

P.C. board.

 

 

 

 

 

 

 

Discharging position

 

Check

 

 

 

 

 

NG

 

 

(Discharging period

 

terminal voltage

 

 

 

 

 

10 seconds or more)

Plug of

of electrolytic

 

 

 

 

capacitor.

 

 

 

 

 

soldering

 

 

 

 

 

iron

 

OK

Check

 

 

 

 

 

 

 

 

 

 

electrolytic

 

 

 

 

 

 

capacitor, diode

 

 

 

 

 

 

(DB01),

 

 

 

 

 

 

etc.

 

 

 

 

 

 

 

 

 

 

 

 

 

Does outdoor

 

NO

Operation

Turn on the power breaker,

 

 

 

 

fan rotate?

 

 

 

 

 

 

 

 

YES

 

 

 

 

and operate the air condi-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tioner in COOL mode by time

 

 

 

 

 

 

 

 

 

 

 

OK if 760µF →

 

 

 

 

 

 

 

 

 

shortening.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DC280 to 380V

 

 

 

 

 

 

 

 

Measure-

Measure terminal voltage of

 

 

 

 

 

 

 

 

 

 

ment

the electrolytic capacity.

Remove CN300 while

 

 

 

 

 

 

 

 

 

 

 

 

pushing the part indicated

 

 

 

 

 

 

 

 

 

 

760µF:400WV × 3

 

by an arrow because CN300

 

 

 

 

 

 

 

 

 

After operation, turn off the

is a connector with lock.

 

 

 

 

 

Remove connector

Check

 

 

 

 

 

 

 

power breaker after 2

 

 

 

 

 

 

 

CN300 of outdoor fan

 

 

 

 

NG

 

minutes 20 seconds passed,

 

 

 

 

motor, and using a

 

 

 

 

 

 

 

tester, check resistance

 

and discharge the electro-

 

 

 

 

 

 

 

value between every

Stop

lytic capacitor by soldering

 

 

 

 

 

 

 

phases at motor side.

 

iron.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OK

 

Check voltage between

 

 

 

 

 

 

 

 

 

 

 

motor phases.

 

 

 

 

 

 

 

 

 

 

Check

 

 

 

 

 

 

 

Replace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Measure-

• Is not winding between Q-

 

 

 

 

outdoor

 

 

 

 

→

Resistance between

 

 

fan motor.

 

 

 

 

ment

R‚ R-S, or Q-Sopened

 

 

 

 

 

 

 

 

 

or short-circuited?

 

phases should be

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

approx. 55 to 77Ω

A

 

 

 

 

• Is not frame grounded with

 

 

 

B

 

→

Should be 10MΩ or

 

 

 

 

 

 

 

 

 

Q, R, or S?

 

 

 

 

 

 

 

 

 

 

 

 

 

more.

– 75 –

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Toshiba RAS-13GAVP-E How to Diagnose Trouble in Outdoor Unit, Summarized Inner Diagnosis of Inverter Assembly
Page 74 Page 76

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