Mitsubishi Electric 500YEMK-A, Руководство по обслуживанию

Страница: 175 / 208

-172-
Checking
code
6608
Meaning, detecting method Cause Checking method & Countermeasure
No response error
Though acknowledgement of re-
ceipt (ACK) is received after
transmission, no response com-
mand is returned.
Detected as error by transmission
side when the same symptom is
re-peated 10 times with an inter-
val of 3 seconds.
Note:
The address/attribute
shown on remote control-
ler indicates the control-
ler which has detected
error.
1) At the collision of mutual transmis-
sion data when transmission wiring
is modified or the polar ity is
changed while turning the power
source on, the wave shape changes
detecting error.
2) Repeating of transmission error due
to noise.
3) Damping of transmission line volt-
age/signal due to exceeding of the
acceptable range for transmission
wiring.
• Farthest
Less than 200m
• RC wiring Less than 10m
4) Damping of transmission voltage/
signal due to improper type of
transmission line.
• Wire size : More than 1.25mm
2
a) Generation at test run.
Turn off the power sources of OC unit
unit for more than 5 minutes simultaneously,
and make them again.
Returning to normal state means the trouble
detection due to transmission line work while
powering.
b) Check 3) and 4) of the causes left.
c) Investigate the transmission wave shape/noise
on transmission line according to <Investigation
method of transmission wave shape/noise>.
Much possibility of a noise if 6602 is generated.
and IC
Check code Checking method and remedy
6831 MA
communication,
No-reception
error
1. Communication between
2. No proper data has been
received for 3 minutes.
6834 MA
communication,
Start bit error
1. Communication between
2. No proper data has
1) The remote control line of the
MA remote controller or the
indoor unit is in poor contact.
2) All remote controllers are slaves.
3) The wiring specifications are not
observed.
1. Wire lingth
2. Wire thickness
3. Number of remote controllers
4. Number of indoor units
4) After the remote controller is
connected, disconnection of the
remote controller without
resetting the power.
5) Noise enters the transfer path of
the remote controller.
6) The transmission/reception circut
of the remote controller of the
indoor unit is poor.
7) The transmission/reception circut
of the remote controller is
defective.
6832 MA
communication,
Synchronization
recovery error
1. Communication between
6833 MA
communication,
Transmission
/reception
1. Communication between
2. When the transmitted
1) The remote control line of the
MA remote controller or the
indoor unit is in poor contact.
2) It is set on two or more main
remote controllers.
3) The indoor unit addres is set
twice.
4) Noise enters the remote
controller line.
5) The wiring specifications are not
observed.
1. Wire length
2. Wire thickness
3. Number of remote controllers
4. Number of indoor units
6) The transmission/reception
circuit of the remote controller
is defective.
(1) Check the transmision lines of the
(2) Check the power supply to the main
power and remote controller lines.
(3) Check whether the tolerable range
(4) Check the main/slave setting of the
MA remote controller.
(5) Diagnose the remote controller.
Result:
(wiring specifications
check)
[6832, 6833, ERC]:
The noise is the cause.
(6) Check the transmision waveform
(7) If no problem is present in items.
(1) to (6) above, replace the indoor
controller board or MA remote
controller.
The following states can be checked
from LED1 and LED2 on the indoor
controller board.
LED1 is lit at the same time.
The main power is supplied to
the indoor unit.
LED2 alone is lit.
Power is supplied to the MA
remote controller line.
controller
(To (6))
and noise on the transmission
signal of MA remote controller line.
Factor
Meaning and
detection means
hardware error
the MA remote
controller and the
indoor unit is not done
properly.
the MA remote
controller and the
indoor unit is not done
properly.
been received for 2
minutes.
the MA remote controller
and the indoor unit is not
done properly.
2. When transmission is
impossible because the
emptiness of the transfer
path cannot be checked.
Indoor unit:
3 minutes
Remote controller:
6 seconds
the MA remote controller
and the indoor unit is not
done properly.
data is received at the
same time and compared,
the different state
continues 30 times.
indoor unit and MA remote
controller for disconnection and
looseness.
of the MA remote controller line is
exceeded or not.
(Remote controller IM description)
[OK]: No problem in the remote
[NG]: Replace the remote
controller.
•
•