Mitsubishi Electric PUMY-P100VHM Technical & Service Manual page 47

From the previous page.
Display
Meaning and detecting method
6607
6) When the controller of displayed
address and attribute is not recognized
6608
No response
Though there was a reply (ACK) of
having received signal from the other
side, it is the abnormality when the
response command does not return.
The sending side detects the
abnormality continuously six times every
30 seconds.
Note) Address/Attribute displayed on the
remote controller shows the controller,
which did not response.
Causes
2) When synchronized operating with
other refrigerant system lossnay, the
indoor units transmit the signal to the
lossnay after the lossnay and same
refrigerant system outdoor unit is turned
off or turned on again in 2 minutes, and
detects abnormality.
3) Contact failure of lossnay or indoor
unit transmission cable.
4) Indoor unit transmission connector
(CN2M) disconnection.
5) Sending/receiving signal circuit
failure in the indoor unit or lossnay.
1) Since the address switch was
changed with the current passed, the
unit in the last address does not exist.
2) Since the fresh master/ lossnay
address are changed after
synchronized setting of fresh master/
lossnay by the remote controller,
abnormality is detected at
transmitting from the indoor unit.
1) Transmission repeats the failure by
the noise etc.
2) Decline of transmission voltage and
signal by transmission cable tolerance
over.
· The furthest point···200m
· Remote controller cable···(12m)
(Refer to 7-3.)
3) Decline of transmission line voltage
and signal by unmatched kind of cable.
· Shield wire-CVVS,CPEVS
wire diameter···1.25eor more
4) Miss operation of origin controller,
which happens by chance.
47
Check points
1
Check the transmission wave and
noise on the transmission cable.
2
Turn off power supply of outdoor unit,
indoor unit and lossnay for 2 minutes
or more at the same time. Then, turn
on power supply again. It recovers
normally at the malfunction that
happens by chance. When same
abnormality occurs again, it is defective
of displayed address and attribute.