MITSUBISHI ELECTRIC FR-A500L - Manual (Page 48)

PROTECTIVE FUNCTIONS
37
z z z z Checking the inverter and converter modules
(1) Disconnect the external power supply cables (R, S, T)
1
, L
2
, L
3
> and motor cables (U, V, W).
(2) Prepare a tester. (Use 100 Ω range.)
Change the polarity of the tester alternately at the inverter terminals R, S, T, U, V, W, P and N
1
, L
2
, L
3,
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.
Tester Polarity Tester Polarity Measured
Value
Measured
Value
R
1
> P<+> Discontinuity R
1
> N<-> Continuity
D1
P<+> R
1
> Continuity
D4
N<-> R
1
> Discontinuity
S
2
> P<+> Discontinuity S
2
> N<-> Continuity
D2
P<+> S
2
> Continuity
D5
N<-> S
2
> Discontinuity
T
3
> P<+> Discontinuity T
3
> N<-> Continuity
C
onverter m
odul
e
D3
P<+> T
3
> Continuity
D6
N<-> T
3
> Discontinuity
U P<+> Discontinuity U N<-> Continuity
TR1
P<+> U Continuity
TR4
N<-> U Discontinuity
V P<+> Discontinuity V N<-> Continuity
TR2
P<+> V Continuity
TR6
N<-> V Discontinuity
W P<+> Discontinuity W N<-> Continuity
In
verter m
odul
e
TR5
P<+> W Continuity
TR2
N<-> W Discontinuity
D1 D2 D3
D4 D5 D6
TR1 TR3 TR5
TR4 TR6 TR2
U
V
W
R
1
>
S
2
>
T
3
>
C
P<+>
N
<->
Inverter module Converter module