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