Mitsubishi Electric FR-CV-7.5K Instruction Manual page 40

Area of Inspection
Inspection Item
(1) Perform
Control
circuit Operation
check
Protective
circuit
(1) Check for unusual
Cooling
Cooling fan
system
(2) Check for loose
(1) Check if LED
Display
(2) Clean.
Display
Check that reading is
Meter
normal.
Checking the converter module
<Preparation>
(1) Disconnect the external power supply cables (R2/L1, S2/L2, T2/L3, P/L+, N/L-).
(2) Prepare a meter. (Use 100Ω range.)
<Checking method>
Change the polarity of the tester alternately at the converter terminals R2/L1, S2/L2, T2/L3, P/L+, N/L- 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.
<Module device numbers and terminals to be checked>
Tester Polarity
+ -
R2/L1 P/L+
D1
P/L+ R2/L1
S2/L2 P/L+
D2
P/L+ S2/L2
T2/L3 P/L+
D3
P/L+ T2/L3
R2/L1 N/L-
D4
N/L- R2/L1
S2/L2 N/L-
D5
N/L- S2/L2
T2/L3 N/L-
D6
N/L- T2/L3
(Assumes the use of an analog meter.)
Precautions for Maintenance and Inspection
Interval
Periodic
Description
sequence
protective
operation test to
make sure of no
fault in protective
and display
circuits.
vibration and
noise.
connection.
lamp is blown.
Measured Value
Discontinuity
Continuity
Discontinuity
Continuity
Discontinuity
Continuity
Continuity
Discontinuity
Continuity
Discontinuity
Continuity
Discontinuity
Method Criterion
(1) Simulatively
connect or (1) Fault must
disconnect inverter occur because
protective circuit of sequence.
output terminals.
(1) Turn by hand with No unusual
power off. vibration, unusual
(2) Re-tighten noise.
(1) Light indicator
(1) Check that
lamps on panel.
lamps are lit.
(2) Clean with rag.
Must satisfy
Check reading of specified and
meters on panel. management
values.
D1
R2/L1
S2/L2
T2/L3
D4
35
Instrument
Voltmeter,
ammeter, etc.
P/L+
D2 D3
C
D5 D6
N/L-
3