MITSUBISHI ELECTRIC FR-S520 - Manual (Page 162)

153
Checking the inverter and converter modules
(1) Disconnect the external power supply cables (R, S, T) and motor cables (U, V, W).
(2) Prepare a meter. (Use 100
Ω
range.)
Change the polarity of the meter alternately at the inverter terminals R, S,
T, U, V, W, P and N, and check for continuity.
CAUTION
Before measurement, check that the smoothing capacitor is discharged.
At the time of continuity, the measured value is several to several ten's-of ohms
depending on the number of modules, number of parallel modules, 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 P Discontinuity R N Continuity
D1
P R Continuity
D4
N R Discontinuity
S P Discontinuity S N Continuity
D2
P S Continuity
D5
N S Discontinuity
T P Discontinuity T N Continuity
Conv
er
te
r
modul
e
D3
P T Continuity
D6
N T Discontinuity
U P Discontinuity U N Continuity
TR1
P U Continuity
TR4
N U Discontinuity
V P Discontinuity V N Continuity
TR3
P V Continuity
TR6
N V Discontinuity
W P Discontinuity W N Continuity In
v
e
rte
r
modul
e
TR5
P W Continuity
TR2
N W Discontinuity
(Assumes the use of an analog meter.)
Converter
module Inverter module
D1 D2 D3
D4 D5 D6
TR1 TR3 TR5
TR4 TR6 TR2
U
V
W
R
S
T
C
P
N
REMARKS
The FR-S520S-0.1K to 1.5K and FR-S510W-0.1K to 0.75K do not have T, D3 and D6.