PROTECTIVE FUNCTIONS

zChecking the inverter and converter modules

<Preparation>

(1)Disconnect the external power supply cables (R, S, T) <L1, L2, L3> and motor cables (U, V, W).

(2)Prepare a tester. (Use 100range.)

<Checking method>

Change the polarity of the tester alternately at the inverter terminals R, S, T, U, V, W, P and N <L1, L2, L3, U, V, W, + and ->, and check for continuity.

Note: 1. Before measurement, check that the smoothing capacitor is discharged.

2.At the time of continuity, the measured value is several to several ten’s-of ohms depending on the module type, circuit tester type, etc. If all measured values are almost the same, the modules are without fault.

<Module device numbers and terminals to be checked>

 

 

Tester Polarity

Measured

 

Tester Polarity

Measured

 

 

 

 

 

Value

 

 

 

Value

module

D1

R<L1>

P<+>

Discontinuity

D4

R<L1>

N<->

Continuity

P<+>

R<L1>

Continuity

N<->

R<L1>

Discontinuity

 

 

D2

S<L2>

P<+>

Discontinuity

D5

S<L2>

N<->

Continuity

Converter

P<+>

S<L2>

Continuity

N<->

S<L2>

Discontinuity

 

 

D3

T<L3>

P<+>

Discontinuity

D6

T<L3>

N<->

Continuity

P<+>

T<L3>

Continuity

N<->

T<L3>

Discontinuity

 

 

 

 

 

module

TR1

 

U

P<+>

Discontinuity

TR4

U

N<->

Continuity

P<+>

U

Continuity

N<->

U

Discontinuity

 

 

TR2

 

V

P<+>

Discontinuity

TR6

V

N<->

Continuity

Inverter

P<+>

V

Continuity

N<->

V

Discontinuity

 

 

TR5

 

W

P<+>

Discontinuity

TR2

W

N<->

Continuity

P<+>

W

Continuity

N<->

W

Discontinuity

 

 

 

 

 

Converter module

P<+>

Inverter module

 

 

 

 

 

 

 

 

 

TR1

TR3

TR5

 

 

 

 

D1

D2

D3

 

 

 

 

 

 

 

R

 

 

 

C

 

 

 

U

 

 

<L1>

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S

 

 

 

 

 

 

 

V

 

 

<L2>

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T

 

 

 

 

 

 

 

W

 

 

<L3>

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D4

D5

D6

 

 

 

 

 

 

 

 

 

 

 

 

TR4

TR6

TR2

 

 

 

 

 

 

 

N

 

 

 

 

 

 

 

 

 

 

<->

 

 

 

 

 

37

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Image 48
Mitsubishi Electronics FR-A500L Preparation, Checking method, Module device numbers and terminals to be checked