Omron SYSDRIVE MX2 SERIES User Manual page 382

7-2 Troubleshooting
Operation/setting
cannot be
performed via
Modbus
communication
(Modbus-RTU).
The earth leakage
breaker trips when
the Inverter is
operated.
7
DC injection
braking does not
work.
An Undervoltage
Trip (E09) occurs.
Noise enters in the
TV or radio located
near the Inverter.
7-15
Condition Possible cause
Changes to
communication
parameters are not
reflected.
The setting of RUN
Command Selection
(A002/A202) is not correct.
The setting of Frequency
Reference Selection
(A001/A201) is not correct.
The communication
speed is not set correctly.
The station number is not
set correctly or duplicated.
The communication parity
is not set correctly.
The communication stop
bit is not set correctly.
The wiring is incorrect.
The Inverter leak current
is large.
The DC injection braking
power is not set.
The DC injection braking
time is not set.
The voltage drops due to
insufficient power supply
capacity.
Irradiated noise from the
Inverter.
Remedial actions
If the setting of Communication Speed
Selection (C071), Communication Parity
Selection (C074) or Communication Stop
Bit Selection (C075) was changed,
reconnect the power or perform a reset (by
turning the RS terminal ON and then OFF).
Set RUN Command Selection (A002/
A202) to "03: Modbus communication
(Modbus-RTU)".
Set Frequency Reference Selection (A001/
A201) to "03: Modbus communication
(Modbus-RTU)".
Set the correct communication speed in
Communication Speed Selection (C071).
Set the correct station number in
Communication Station No. Selection
(C072).
Set the correct communication parity in
Communication Parity Selection (C074).
Set the correct stop bit in Communication
Stop Bit Selection (C075).
Correctly wire the RS+ and RS− terminals
on the control circuit terminal block.
Decrease the Carrier Frequency (b083).
Increase the sensitivity current of the earth
leakage breaker. Or, replace the earth
leakage breaker with one of higher
sensitivity current.
Set DC Injection Braking Power (A054).
Set DC Injection Braking Time (A055).
Increase the power supply capacity.
Extend as much as possible the wiring
distance from the TV or radio to the
Inverter.
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
Reference
Page
6-3
5-22
5-15
6-3
6-3
6-3
6-3
6-2
5-51
2-17
5-135
5-135
−
−