PROTECTIVE FUNCTIONS
179
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Checking the inverter and converter modules
<Preparation>
(1)Disconnect the external power supply cables (L
1
, L
2
, L
3
) 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 L
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 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
L
1
+
Discontinuity
L
1
−
Continuity
D1
+
L
1
Continuity
D4
−
L
1
Discontinuity
L
2
+
Discontinuity
L
2
−
Continuity
D2
+
L
2
Continuity
D5
−
L
2
Discontinuity
L
3
+
Discontinuity
L
3
−
Continuity
Conv
er
te
r
m
odule
D3
+
L
3
Continuity
D6
−
L
3
Discontinuity
U
+
Discontinuity
U
−
Continuity
TR1
+
U
Continuity
TR4
−
U
Discontinuity
V
+
Discontinuity
V
−
Continuity
TR3
+
V
Continuity
TR6
−
V
Discontinuity
W
+
Discontinuity
W
−
Continuity
In
v
e
rt
er
m
odule
TR5
+
W
Continuity
TR2
−
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
L
1
L
2
L
3
C
+
−
Note:
The FR-E520S-0.4K to 2.2K do not have L
3
, D3 and D6.
