Mitsubishi Electric AE-200A Service Handbook page 59

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[V Troubleshooting]
Error
Description and method
code
of detection
M-NET communication
error - No ACK return
Error detected by
AHC ADAPTER when
the other party fails to
return the ACK signal
after a command
transmission on
M-NET.
6604
M-NET communication
error - No return of
response frame
Error indicating that
the ACK signal was
returned to
acknowledge receipt
6605
but no response was
returned when a
communication
command was sent
over M-NET.
Communication error -
Transmission processor
communication error
Failure with
communication
between the device
processor on the
6606
board and the
transmission
processor.
Cause
1)
Incorrect initial settings
2)
The address of the other party on the
M-NET transmission line changed
during transmission.
3)
Defective M-NET transmission line
4)
Transmission line or connector
disconnected at the address of the
other party in M-NET communications.
5)
Other party in M-NET communications
is effective
6)
For communications about multiple
refrigerants, the transmission line or
connector is disconnected from the
terminal block for centralized control
(TB7).
7)
For communications about multiple
refrigerants, power is cut to an outdoor
unit.
8)
For communications about multiple
refrigerants, the power connector
(CN40) was not inserted in an outdoor
unit.
9)
For communications about multiple
refrigerants, two or more power
connectors (CN40) were inserted for
centralized control.
10) For communications about multiple
refrigerants, an outdoor unit power
supply system is defective.
11) Transmitted data changed due to noise
on the M-NET transmission line.
1)
Transmission line work was performed
while power is supplied to M-NET.
2)
Transmitted data changed due to noise
on the M-NET transmission line.
3)
Transmission line voltage/signal
attenuation as M-Net transmission line
exceeded its permitted length range.
Remote end: 200 m max.
4)
Transmission line voltage/signal
attenuation due to mismatch in M-Net
transmission line types.
Cable cross-sectional area: 1.25 mm
min.
1)
Error that occurs when data was not
transmitted normally due to an
unexpected erroneous operation of the
controller on which the error occurred.
2)
Failure of the controller on which the
error occurred.
3)
Error due to abnormal data
transmission due to a chance
malfunction of the AHC ADAPTER.
4)
Defective AHC ADAPTER
55
Check procedure and remedy
An AHC ADAPTER No ACK return error was
displayed on the remote controller or centralized
controller.
Follow the procedure below to determine the
address of the unit that caused the AHC
ADAPTER error.
(1) Use the centralized controller or Maintenance
Tool to check for abnormalities in the I/O data
held in Mitsubishi air conditioners set by the
initial settings.
(No value is displayed when data is abnormal.)
→ If an abnormality exists, check for problems
in the unit at the address where the
corresponding data is held and for problems
in the M-NET transmission line connected to
the unit or in the unit itself. (For
communications about multiple refrigerants,
also investigate intermediate outdoor units.)
(2) Check for incorrect remote controller or
centralized controller settings that do not
correspond to (1) above.
→ If incorrect settings are discovered at steps
(1) or (2), use Maintenance Tool to repeat
the initial settings.
If the cause does not correspond to steps (1) or
(2), check for noise in the M-NET transmission
line.
Cut the power supply from the unit (outdoor unit or
power supply unit) that supplies power to AHC
ADAPTER, or reset the error from the remote
controller or centralized controller.
→ If the same error recurs, see causes 3) and 4).
→ If causes 3) and 4) do not apply, check the
transmission waveform and noise in the
transmission line. For details about the check
procedures, refer to the CITY MULTI (Outdoor
Unit) Service Handbook.
2
Causes 1) and 2)
Shut off the AC power of the
AE-200/AE-50/EW-50 and then turn it back on.
→ If the same error occurs again, the controller
on which error occurred has failed.
If the AE-200/AE-50/EW-50 has failed,
replace the AE-200/AE-50/EW-50.
Causes 3) and 4)
Cut the power supply from the unit (outdoor unit or
power supply unit) that supplies power to AHC
ADAPTER, or reset the error from the remote
controller or centralized controller.
→ If the same error recurs, AHC ADAPTER is
defective.

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