Omron MX2 Series - Page 576

11 Maintenance and Inspection
11 - 8
Multi-function Compact Inverter 3G3MX2-EV2 User’s Manual (I666-E1)
Inspection
category
Inspection
item
Inspection
point
Inspection
frequency
Inspection method
Criteria
Meter
Daily
Periodic
1 year
2 years
Main
circuit
Inverter
unit
Converter
unit
(including
resistors)
Check resis-
tance between
terminals.

Disconnect wires from
the inverter main circuit
terminal block and mea-
sure the resistance
between the terminals
R/L1, S/L2, T/L3 and the
terminals P/+2, N/−, and
between the terminals
U/T1, V/T2, W/T3 and the
terminals P/+2, N/− with a
tester in the 1  range.
Refer to 11-1-7
Inverter/Converter
Unit Test on page
11-10.
Inverter unit replace-
ment interval:
10
6
start-stop cycles
*3
Analog
tester
Smoothing
capacitor
*1
Check that there
is no liquid leak-
age.

Perform visual inspec-
tion.
No faults
Capacity
meter
Check that the
safety valve
does not come
out and that
there is no
bulge.

Relay
Check for chat-
tering sound
during opera-
tion.

Perform acoustic inspec-
tion.
No faults
Check for rough
contact surface.

Perform visual inspec-
tion.
No faults
Control
circuit,
protection
circuit
Operation
check
Check output
voltage balance
between phases
during
stand-alone
inverter opera-
tion.

Measure the line voltage
between the inverter
main circuit terminals
U/T1, V/T2, and W/T3.
Phase-to-phase volt-
age balance
200-V class: 4 V max.
400-V class: 8 V max.
Digital
multimeter
Rectifier
Voltmeter
Check that there
is no error in
protection and
display circuits
through
sequence pro-
tection function
test.

Short-circuit or open the
inverter protection circuit
output under simulated
conditions.
Error is found in the
sequence.
Cooling
system
Cooling
fan
Check for
abnormal vibra-
tion and sound.

Rotate the fan manually
with the power off.
Smooth rotation, no
faults
*2
Check for loose
connections.

Perform visual inspec-
tion.
Cooling
fin
Check for clog-
ging.

Perform visual inspec-
tion.
No clogging