Troubleshooting - Omron MX2 Series User Manual

10-2 Troubleshooting

If you feel that the inverter operation is strange or that the inverter does not operate as intended, use
the following information as a reference, even if the inverter displays no alarm indication.
If the inverter trips with an alarm indication, refer to 10-1 Alarm Display and Remedies on page 10-2.
Symptom
The power supply is
not turned on. (The
POWER LED on
the inverter is not
lit.)
The RUN command
is input, but the
motor does not
rotate.
Multi-function Compact Inverter 3G3MX2-EV2 User's Manual (I666-E1)
Possible cause
The short-circuit bar between
the terminal +1 and P/+2 is
removed, or no DC reactor is
connected.
Input wiring is disconnected.
The 1st RUN Command Selec-
tion (A002) setting is incorrect.
The 1st Frequency Reference
Selection (A001) setting is
incorrect.
The frequency is set to 0 Hz.
No multi-function input termi-
nal is allocated for the RUN
command.
The Multi-function Input 1 to
7 Selection (C001 to C007)
are set to 02 (CF1) to 05 (CF4)
and those terminals are ON to
enable the Multi-step speed
setting.
Both the forward and reverse
input terminals are ON.
Remedy
Install the short-circuit bar, or connect a DC
reactor.
Check the input wiring.
Set the 1st RUN Command Selection (A002)
correctly.
Set the 1st Frequency Reference Selection
(A001) correctly, then set the frequency
according to the selected frequency reference
input method.
When the 1st Frequency Reference Selection
(A001) is set to 01 (Control circuit terminal
block), input the analog voltage or current sig-
nal corresponding to the frequency to the ter-
minal O or OI. For details on switching
between the analog voltage and current sig-
nals, refer to 5-5-1 Frequency Reference
Selection on page 5-23.
When the 1st Frequency Reference Selection
(A001) is set to 02 (Digital Operator), input the
frequency in the Output Frequency Set-
ting/Monitor (F001).
Set the frequency according to the 1st Fre-
quency Reference Selection (A001) setting.
(The input frequency will be displayed in the
Output Frequency Setting/Monitor (F001).)
For the multi-step speed operation, set the
frequency to the Multi-step Speed Reference
0 to 15 (A020 to A035, A220).
To input the RUN command via a multi-func-
tion input terminal, set the Multi-function Input
1 to 7 Selection (C001 to C007) to 00 (FW) or
01 (RV).
To input the RUN command via the 3-wire
input function, set them to 20 (STA), 21
(STP), and 22 (F/R).
Disable the Multi-step speed setting. When
this setting is enabled, multi-step speed oper-
ation is performed, so the motor does not
rotate if the frequency values in the Multi-step
Speed Reference 1 to 15 (A021 to A035) are
0 (default).
To input the RUN command via the for-
ward/reverse input terminal, turn ON either of
them.
10 Troubleshooting
Reference
page
P. 2-12
P. 2-28
P. 5-21
P. 5-23
P. 5-48
P. 5-47
P. 5-53
P. 5-48
P. 5-47
10 - 13
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