Mitsubishi Electric AE-200A Service Handbook page 61

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[V Troubleshooting]
Error
Description and method
code
of detection
Communication error -
No ACK return
Error detected by the
controller on the
transmission side
when there is no reply
(ACK signal) from the
other party after
transmission.
Communication error -
No return of response
frame
When transmission
was performed, there
was an
acknowledgment
(ACK) to notify that the
transmission was
received from the
other party but the
response command
6608
was not returned.
The transmission side
detects an error 10
consecutive times at
3-second intervals.
Communication error -
No return of response
frame
6920
System abnormality -
Attribute setting error
7106
Cause
Address that should not exist
An address that does not exist is set in the
group registration, interlock LOSSNAY
settings, or measurement settings of the
AE-200/AE-50/EW-50.
1)
When work was performed or the
polarity was changed for the
transmission line while the power was
left on, the waveform changed and an
error was detected when the
transmission data collided.
2)
Transmission fails repeatedly because
of, for example, noise.
3)
Attenuation of the transmission line
voltage/signal because the allowable
range for the transmission line wiring
has been exceeded.
Farthest end: 200 m (656 ft) or less
Remote controller line: 10 m (32 ft)
or less
4)
Attenuation of the transmission
voltage/signal because mismatch of
transmission line types.
Wire diameter: 1.25 mm
5)
The set temperature range limit is set in
a system with a remote controller that
does not support the set temperature
range limit connected.
1)
LAN contact failure.
2)
The power of the HUB is not on.
3)
The IP address has not been set.
4)
Is the length of the LAN cable 100 m
(328 ft) or less?
5)
Is the transmission delay time 4
seconds or less round trip?
1)
A unit with a different attribute
(air-conditioning unit or other unit) is set
for the address for which the PI
controller or other device should be set.
2)
The unit address set for the interlock
source in the interlock LOSSNAY
settings is not a LOSSNAY.
3)
The attribute (IC/FU) setting of the OA
Processing unit is not correct.
57
Check procedure and remedy
Check whether the address that does not exist in
the system configuration is set in the group
registration, interlock LOSSNAY settings, or
measurement settings.
If it is set, delete it.
a)
When occurs during test run
Turn off the power of the outdoor units, indoor
units, and LOSSNAY at the same time, leave
it off for at least 5 minutes, and then turn it
back on.
→ If the equipment recovers from the error
normally, the error was detected because
transmission work was performed while
the power was on.
→ If the error occurs again, proceed to b).
b)
Check causes 3) and 4).
→ If you find the cause, fix the problem.
→ If you do not find the cause, proceed to c).
c)
Check the transmission waveform and noise
on the transmission line. Perform the check
in accordance with <Transmission waveform
and noise check procedure>.
If 6608 is occurring, it is very likely
2
or more
to be due to noise.
d)
If the cause is not any of 1) to 4), check the
system operating status and configuration.
→ If you find the cause, reset the remote
controller.
Cause 1) Check that the LAN cables between the
AE-200/AE-50/EW-50 and HUB are
connected.
Cause 2) Check that the power of the HUB is on.
Cause 3) Check the IP address of the
AE-200/AE-50/EW-50.
Cause 5) Check the communication state by
pinging.
For the ping check method, refer to "V [5]
2. About the check method using ping."
If the ping is timed out, check the
following.
・ Are LAN cables of category 5 or better being
used?
・ Is there not connections to four or more layers
using a gateway, router, etc.?
Cause 1) In the case of AE-200/EW-50, change
the setting address of the PI controller,
etc. to the correct address. Alternatively,
delete it.
Cause 2) Change the address set for the interlock
source in the interlock LOSSNAY
settings to the correct address.
Alternatively, delete it.
Cause 3) Switch the attribute with the dip switch.
For details, refer to the installation
manual for OA Processing unit.

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