Справочник Пользователя для Mitsubishi Electronics A800



 • Disconnect the external power supply cables (R/L1, S/L2, T/L3) and motor cables (U, V, W). (The inverter and the converter 

unit (FR-CC2) can be measured with those cables connected.)

 • Prepare a tester. (For the resistance measurement, use the 100 

 range.)



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

 • Before measurement, check that the smoothing capacitor is discharged.
 • At the time of electric discontinuity, the measured value is almost ∞. When there is an instantaneous electric continuity, due to 

the smoothing capacitor, the tester may not indicate ∞. At the time of electric continuity, the measured value is several 

 to 

several tens of 

. If all measured values are almost the same, although these values are not constant depending on the 

module type and tester type, the modules are without fault.



(Assumes the use of an analog meter.)

C

onvert

e

r

m

odule

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

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

In

ve

rt

e

r

m

odule

TR1

U

P/+ Discontinuity

TR4

U

N/-

Continuity

P/+

U

Continuity

N/-

U

Discontinuity

TR3

V

P/+ Discontinuity

TR6

V

N/-

Continuity

P/+

V

Continuity

N/-

V

Discontinuity

TR5

W

P/+ Discontinuity

TR2

W

N/-

Continuity

P/+

W

Continuity

N/-

W

Discontinuity

Converter module

Inverter module

D1

D2

D3

D4

D5

D6

TR1

TR3

TR5

TR4

TR6

TR2

U

V

W

R/L1

S/L2

T/L3

C

C

P/+

N/-

P/+

N/-