Mitsubishi Electric FR-S500 Series, Instruction Manual

Page: 198 / 222

188
Precautions for maintenance and inspection
3.3.7 Checking the inverter and converter module
<Preparation>
(1) Disconnect the external power supply cables (R, S, T) and motor cables (U, V, W).
(2) Prepare a tester. (Use 100
Ω
range).
<Checking method>
Change the polarity of the tester alternately at the inverter terminals R, S, T, U, V, W, P
and N, and check for continuity.
Module device numbers and terminals to be checked
(Assumes the use of an analog meter.)
CAUTION
•
Before measurement, check that the smoothing capacitor is discharged.
•
At the time of discontinuity, the measured value is almost
∞
. When there is an
instantaneous continuity, due to the smoothing capacitor, the tester may not
indicate
∞
. 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
Process
value
Tester Polarity
Process
value
C
onver
ter
M
odul
e
D1
R P Discontinuity
D4
R N Continuity
P R Continuity N R Discontinuity
D2
S P Discontinuity
D5
S N Continuity
P S Continuity N S Discontinuity
D3
T P Discontinuity
D6
T N Continuity
P T Continuity N T Discontinuity
Inver
te
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
REMARKS
The FR-S520SE-0.1K to 1.5K and FR-S510WE-0.1K to 0.75K do not have T, D3 and D6.
Converter module Inverter module
D1 D2 D3
D4 D5 D6
TR1 TR3 TR5
TR4 TR6 TR2
U
V
W
C
R
S
T
P
N