M-Net Communication Error - Mitsubishi Electric PUHZ-RP3VHA Technical & Service Manual

<M-NET communication error>
Error Code Meaning of error code and detection method
Address duplicate definition
This error is displayed when transmission
from the units of same address is detect-
ed.
A0
Note) The address and attribute displayed
(6600)
at remote controller indicate the con-
troller that detected abnormality.
Hard ware error of transmission
processor
Transmission processor intended to trans-
mit "0", but "1" appeared on transmission
wire.
Note) The address and attribute display at
A2
remote controller indicate the con-
(6602)
troller that detected abnormality.
BUS BUSY
1. Over error by collision damage
Abnormal if transmitting is not possible
for 8-10 minutes continuously because
of collision of transmission.
2. Data could not reach transmission wire
for 8-10 minutes continuously because
of noise or etc.
Note) The address and attribute displayed
at remote controller indicate the con-
A3
troller that detected abnormality.
(6603)
Communication error with communica-
tion processor
Defective communication between unit
processor and transmission processor
Note) The address and attribute display at
A6
(6606) remote controller indicate the con-
troller that detected abnormality.
(Note) "Indoor unit" in the text indicates M-NET p.c. board in outdoor unit.
Case
1 There are two or more same
address of controller of out-
door unit, indoor unit, FRESH
MASTER, or LOSSNAY.
2 Noise has entered into trans-
mission signal and signal was
transformed.
1 Error is detected if waveform is
transformed when wiring works
of transmission wire of outdoor
unit, indoor unit, FRESH MAS-
TER or LOSSNAY are done,
or polarity is changed with the
power on and transmission
data collide each other.
2 Defective transmitting receiv-
ing circuit of transmission
processor
3 Transmission data is changed
by the noise on transmission.
1 Transmission processor could
not transmit because short
cycle voltage of noise and the
like have entered into trans-
mission wire continuously.
2 Transmission quantity has
increased and transmission is
not possible because there
was wiring mistake of terminal
block for transmission wire
(TB3) and terminal block for
central control (TB7) in out-
door unit.
3 Transmission are mixed with
others and occupation rate on
transmission wire rose
because of defective repeater
(a function to connector or dis-
connect transmission of con-
trol and central control system)
of outdoor unit, then abnormal-
ity is detected.
1 Data of transmission proces-
sor or unit processor is not
transmitted normally because
of accidental trouble such as
noise or thunder surge.
2 Address forwarding from unit
processor is not transmitted
normally because of defective
transmission processor hard-
ware.
34
Judgment and action
Search the unit with same address as abnor-
mality occurred. If the same address is found,
shut of the power supply of outdoor unit and
indoor unit and FRESH MASTER or LOSSNAY
at the same time for two minutes or more after
the address is corrected, and put the power on
again.
Check transmission waveform or noise on
transmission wire.
1 If the works of transmission wire is done with
the power on, shut off the power supply of
outdoor unit and indoor unit and FRESH
MASTER or LOSSNAY at the same time for
two minutes or more, and put the power on
again.
2 Check transmission waveform or noise on
transmission wire.
1 Check if transmission wire of indoor unit,
FRESH MASTER, LOSSNAY, or remote con-
troller is not connected to terminal block for
central control (TB7) of outdoor unit.
2 Check if transmission wore of indoor unit,
FRESH MASTER or LOSSNAY is not con-
nected to terminal block for transmission
wire of outdoor unit.
3 Check if terminal block for transmission wire
(TB3) and terminal block for central control
(TB7) is not connected.
4 Check transmission waveform or noise on
transmission wire.
Shut of the power supply of outdoor unit and
indoor unit and FRESH MASTER or LOSSNAY
at the same time for two minutes or more, and
put the power on again. System returns nor-
mally if abnormality was accidental malfunction.
If the same abnormality generates again,
abnormality-generated controller may be defec-
tive.