MITSUBISHI ELECTRIC FR-S520 - Manual (Page 162)

153
Checking the inverter and converter modules
<Preparation>
(1) Disconnect the external power supply cables (R, S, T) and motor cables (U, V, W).
(2) Prepare a meter. (Use 100
Ω
range.)
<Checking method>
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.
<Module device numbers and terminals to be checked>
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.