Omron MX2 Series User Manual page 566

10 Troubleshooting
Symptom
The output fre-
quency is unstable.
The output torque is
insufficient.
Removing the Digi-
tal Operator causes
the inverter to trip,
or fall in a free-run
or deceleration stop
state.
The operation/set-
ting via Modbus
communication is
not possible.
10 -
18
Possible cause
The parameter settings are
inappropriate.
The load changes significantly.
The power supply voltage fluc-
tuates.
The parameter settings are
inappropriate.
(During acceleration/constant
speed)
The parameter settings are
inappropriate.
(During deceleration)
The Operation Selection at
External Operator Disconnec-
tion (b165) setting is inappro-
priate.
Changes are not reflected to
the communications parame-
ters.
The 1st/2nd RUN Command
Selection (A002/A202) setting
is incorrect.
The 1st /2nd Frequency Refer-
ence Selection (A001/A201)
setting is incorrect.
The communications speed
setting is incorrect.
The unit number setting is
incorrect or overlaps.
The communications parity set-
ting is incorrect.
The communications stop bit
setting is incorrect.
The wiring is incorrect.
Multi-function Compact Inverter 3G3MX2-EV2 User's Manual (I666-E1)
Remedy
Change the output frequency value slightly
away from the power supply frequency.
Change the 1st/2nd Stabilization Parameter
(H006/H206) value.
Increase the motor/inverter capacity.
Take measure to reduce the fluctuation.
Increase the 1st/2nd Manual Torque Boost
Voltage (A042/A242), 1st/2nd Manual Torque
Boost Frequency (A043/A243) value.
Set the 1st/2nd Torque Boost Selection
(A041/A241) to 01 (Automatic torque boost).
Decrease the Carrier Frequency (b083).
Set the 1st/2nd Control Method (A044/A244)
to 03 (Sensorless vector control).
Increase the value set in the 1st/2nd Deceler-
ation Time 1/2 (F003/F203/A093/A293).
Set the 1st/2nd AVR Selection (A081/A281) to
01 or 02 (OFF).
Use braking resistors or regenerative braking
units.
Set the Operation Selection at External Oper-
ator Disconnection (b165) to 02 (Ignore).
After changing the Communication Speed
Selection (Baud Rate Selection) (C071),
Communication Parity Selection (C074), or
Communication Stop Bit Selection (C075),
cycle the power supply, or reset the inverter
(by turning ON to OFF the terminal RS).
Set the 1st/2nd RUN Command Selection
(A002/A202) to 03 (Modbus communication).
Set the 1st /2nd Frequency Reference Selec-
tion (A001/A201) to 03 (Modbus communica-
tion).
Set a correct communications speed in the
Communication Speed Selection (Baud Rate
Selection) (C071).
Set a correct station number in the Communi-
cation Station No. Selection (C072).
Set a correct parity type in the Communica-
tion Parity Selection (C074).
Set a correct stop bit type in the Communica-
tion Stop Bit Selection (C075).
Connect the wiring correctly to the terminal
RS+/RS− on the control circuit terminal block.
Reference
page
P. 5-23
P. 7-52
−
−
P. 5-59
P. 5-59
P. 7-31
P. 6-3
P. 5-32
P. 7-42
−
P. 7-56
P. 8-5
P. 5-21
P. 5-23
P. 8-5
P. 8-5
P. 8-5
P. 8-5
P. 8-4