Maeda MK0003, Service Manual, Page: 317 / 348

5-23
Symptom Content of the likely cause Countermeasures
Reference
Unable to run/set
with Modbus
communication. The changes on the communication
parameter are not reflected. If the communication transmission speed selection
(C071), communication parity selection (C074), or
communication stop bit selection (C075) were
changed, restart the power or reset (Turn ON then
OFF on the RS terminal).
The primary/secondary run command
selection (A002/A202) is incorrect. Set the primary/secondary run command selection
(A002/A202) to “03: Modbus communication”.
The primary/secondary frequency
command selection (A001/A201) is
incorrect. Set the primary/secondary frequency command
selection (A001/A201) to “03: Modbus
communication”.
The communication speed setting is
incorrect. Set the correct communication speed on the
communication transmission speed selection
(C071).
The station number setting is incorrect.
Or is overlapping. Set the correct station number on the
communication station number selection (C072).
The communication parity setting is
incorrect. Set the correct communication parity on the
communication parity selection (C074).
The communication stop bit setting is
incorrect. Set the correct stop bit on the communication stop
bit selection (C075).
Incorrect wiring. Route the wires properly to the RS+, RS-
terminal of the control circuit terminal block.
Incorrect address. • Check that the coil address and register address
are correct, and that the value “ − 1” from the
register number is set.
• If the Modbus mapping function is being used,
check that the setting is correct, and fix
accordingly.
The circuit breaker
activates when
running the
inverter. The leakage current of the inverter is
large. Reduce the carrier frequency (b083).
Raise the sensitive current of the leakage breaker.
Or replace with circuit breaker with higher sensitive
current.
DC breaking does
not operate. The DC breaking has not been set. Set the DC breaking (A054).
The DC breaking time has not been set. Set the DC breaking time (A055).
Trips with
insufficient voltage
(E09). Voltage drop due to insufficient power
capacity. Raise the power capacity.
Noise is observed
on television sets
and radio near the
inverter. Noise emitted from the inverter. Place the cables of the inverter as far as possible
from the television set and radio.
Optional units fault
(E60 to E68)
occurs. The optional units detected a failure
and reported them. Refer to the manuals of the optional units.
Inverter failure; the optional unit
connector is not operating normally. If the issue cannot be solved on the optional unit
side, it may be a failure. If the issue cannot be
solved after checking the bad linkage and
contamination of the connection part, replace the
inverter.
Optional units fault
(E69) occurs. Communication cannot be carried out
after the optional unit has been
detected. Optional unit may be loose. Check for bad linkage, contamination of the
connection part of the optional unit connector.
Check that the terminal block cover of the inverter
and the cover of the optional unit are properly
linked, and that the screws are properly installed.
The endian function of the Modbus
mapping function is set improperly. Set Modbus mapping endian selection (P400) to
“00: big endian”.