Mitsubishi Electric PU-P71VHA 2.UK Series Service Manual page 52

From the previous page.
Ch eck cod e Meaning of ch eck cod e and d etection meth od
5. If displayed address or attribute is
FRESH MASTER,
Indoor unit detects abnormality when
indoor unit transmitted to FRESH
MASTER and there was no reply (ACK).
6. If displayed address or attribute is
LOSSNAY ,
Indoor unit detects abnormality when
indoor unit transmitted to LOSSNAY and
there was no reply (ACK).
A7
(6607 )
7 . If displayed address or attribute is non-
ex i stent
M-NET• NO RESPONSE
Abnormal if a message was transmitted
and there were reply (ACK) that message
was received, but response command
does not return. Transmitting side detects
abnormality every 30 seconds, six times
continuously.
Note) The address and attribute displayed
at remote controller is indicate the
controller that did not reply (ACK).
OC37 9 J
Case
1 During seq uential operation
of indoor unit and FRESH
MASTER of other refrigerant
system, if indoor unit transmits
to FRESH MASTER while
outdoor unit power supply
of same refrigerant system
with FRESH MASTER is off
or within 2 minutes of restart,
abnormality is detected.
2 Contact failure of transmission
wire of indoor unit or FRESH
MASTER
3 Disconnection of transmission
connector (CN2M) of indoor
unit or FRESH MASTER
4 Defective transmitting receiving
circuit of indoor unit or FRESH
MASTER
1 If the power supply of
LOSSNAY is off, indoor unit
detects abnormality when it
transmits to LOSSNAY .
2 During seq uential operation
of indoor unit and LOSSNAY
of other refrigerant system,
if indoor unit transmits to
LOSSNAY while outdoor
unit power supply of same
refrigerant system with
LOSSNAY is off or within 2
minutes of restart, abnormality
is detected.
3 Contact failure of transmission
wire of indoor unit of LOSSNAY
4 Disconnection of transmission
connector (CN2M) of indoor
unit
5 Defective transmitting
receiving circuit of indoor unit
or LOSSNAY
1 The unit of former address
does not ex i st as address
switch has changed while the
unit was energized.
2 Abnormality is detected
when indoor unit transmit-
ted because the address
of FRESH MASTER and
LOSSNAY are changed after
seq uential operation of FRESH
MASTER and LOSSNAY by
remote controller.
1 Transmitting condition is
repeated fault because of
noise and the like.
2 Ex tension of transmission wire
voltage and signal is caused by
over-range transmission wire.
• Max i mum distance ........ 200m
• Remote controller line .... (12m)
3 Ex t ension of transmission wire
voltage and signal is caused by
type-unmatched transmission
wire.
Type .....
With shield wire-
CV V S, CPEV S
With normal wire (no shield)-
V CTF, V CTFK, CV V
CV S, V V R, V V F, V CT
2
Diameter.....1.25mm or more
4 Accidental malfunction of
abnormality-generated
controller
52
J ud gment and action
Same as mentioned in " A 7" of th e prev ious
page
1 Check transmission waveform or noise on
transmission wire.
2 Turn off the power supply of outdoor unit
and indoor unit and FRESH MASTER or
LOSSNAY at the same time for 2 minutes or
more, and turn the power on again. If mal-
function was accidental, the unit returns to
normal. If the same abnormality generates
again, controller of displayed address and
attribute may be defective.