PROTECTIVE FUNCTIONS

Checking the inverter and converter modules <Preparation>

1)Disconnect the external power supply cables (R, S, T) L1, L2, L3and motor cables (U, V, W).

2)Prepare a meter. (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 Value

 

Tester Polarity

Measured Value

 

 

 

 

 

 

 

module

D1

R L1

P 〈+〉

Discontinuity

D4

R L1

N 〈−〉

Continuity

P 〈+〉

R L1

Continuity

N 〈−〉

R L1

Discontinuity

 

 

 

S L2

P 〈+〉

Discontinuity

 

S L2

N 〈−〉

Continuity

Converter

D2

D5

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

 

 

TR3

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

 

 

 

 

(Assumes the use of an analog meter.)

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

 

 

 

179

Page 193
Image 193
Mitsumi electronic FR-F520-0.75K, 55K instruction manual Checking method, Module device numbers and terminals to be checked