Omron MX2 Series User Manual

11 Maintenance and Inspection
12 - 11
Multi-function Compact Inverter 3G3MX2-EV2 User’s Manual (I666-E1)
Measure the resistance at the inverter main circuit terminals block R/L1, S/L2, T/L3, U/T1, V/T2, W/T3,
RB, P/+2, and N/− by alternating the polarity of the tester to judge the conduction state.
• Before starting the test, measure the voltage between P/+2 and N/− in the DC voltage range to check
that the smoothing capacitor is sufficiently discharged.
• The tester will show nearly infinite resistance in a no-conduction state. (With conduction, the tester
will show a resistance from a few  to several tens of .)
However, it may not show infinite resistance if a momentary conduction is detected due to the influ-
ence of the smoothing capacitor.
The inverter or converter unit is in good condition if the measured value for each item in the following
table is nearly equal, although it does not match exactly because of the element type, tester type, and
so on.
Test Method
11
11-1 Maintenance and Inspection
11-1-7 Inverter/Converter Unit Test
Tester polarity
Measurement
result
+ (Red)
− (Black)
Converter
unit
D1
R/L1
+1
No conduction
+1
R/L1
Conduction
D2
S/L2
+1
No conduction
+1
S/L2
Conduction
D3
T/L3
+1
No conduction
+1
T/L3
Conduction
D4
R/L1
N/−
Conduction
N/−
R/L1
No conduction
D5
S/L2
N/−
Conduction
N/−
S/L2
No conduction
D6
T/L3
N/−
Conduction
N/−
T/L3
No conduction
Tester polarity
Measurement
result
+ (Red)
− (Black)
Inverter
unit
TR1
U/T1
P/+
No conduction
P/+
U/T1
Conduction
TR2
V/T2
P/+
No conduction
P/+
V/T2
Conduction
TR3
W/T3
P/+
No conduction
P/+
W/T3
Conduction
TR4
U/T1
N/−
Conduction
N/−
U/T1
No conduction
TR5
V/T2
N/−
Conduction
N/−
V/T2
No conduction
TR6
W/T3
N/−
Conduction
N/−
W/T3
No conduction
Regenerative
braking unit
TR7
RB
P/+
No conduction
P/+
RB
Conduction
RB
N/−
No conduction
N/−
RB
No conduction

Omron MX2 Series Specifications

General

Cooling Method	Fan cooling
Output Frequency Range	0.1 to 400 Hz
Control Method	V/f control, Sensorless vector control
Protection Functions	Overcurrent, overvoltage, undervoltage, overload, overheating, short circuit
Communication Options	Modbus RTU
Overload Capacity	150% for 60 seconds
Braking Unit	Built-in
Ambient Operating Temperature	-10°C to +50°C
Enclosure	IP20
Storage Temperature	-20°C to +65°C
Humidity	5 to 95% RH (non-condensing)
Altitude	Up to 1000m
Power Supply Voltage	200-240V AC
Input Voltage	3-phase 200-240V AC