w w w . i n n o v a i r . c o m
DELUXE
Inverter
Service
M
anual
(7) E5(5E) -Internal and external communication error
Explanation of
error
Cause:
The frequency converter needs internal and external communication.
When the
communication
is not effective
, the internal and external units will indicate “internal
and
external communication error”.
Three elements are related to communication:
“main internal control panel
"
,
"
connecting cable
"
and
"
main external control panel”
but sometimes the communication error will be indicated when the external unit has
no power and the internal unit cannot connect with the external unit due to other
errors, then such situation shall be distinguished from “pure communication error”
and treated in a different way.
Inspection path:
Check if the external unit can power on and work (normally,
the indicator light will turn off after lighting for several seconds, relay picks up, and
PTC won’t
over
heat)
.
1. Can power on and work: Are the internal unit and external unit matched→is the phase
sequence of connecting wires of internal and external units correct (the live wire of the
internal unit connects with that of the external unit, the null wire of the internal unit
connects with that of the external unit)→Connecting wires touched well→Main
internal control panel replacement→Main external control panel replacement
2. Cannot power on and work: Can AC 220V be delivered to the terminal block of the
external unit→Can the bridge rectifier and module panel generate DC 310V→Can the
main external control panel generate a low voltage power supply of DC 5V→Does the
main external control panel show the status of periodical reset.
Tools required
for inspection
Multimeter, main internal control panel in normal condition
Frequent
problematic part
Connecting wire phase sequence and contact, main internal control panel, main external
control panel, module panel
Inspection
procedure and
key points
1. First, the IDU and the ODU should be matched and connected properly.
2. Observe the main external control panel, turn on the air conditioner, three lights are
all li
t
up then off and the relay pulls in. If not,
there
is
a
power supply problem.
3. Connect the black signal line S to terminal N of ODU. Turn on the A/C, if "E5" is
still reported, the main external control panel need
s
to be replaced. If "E5" is
still
reported at this time, go to step 4.
4. Change a new main internal control panel, if the error code E5 remains, then the
problem should be on the main external control panel.
Special attention
When the e
x
ternal unit
does
not power on:
If the internal terminal board does not
transmit 220V power, replace the main internal control panel; if the external terminal
board has 220V power, first check if (fuse, reactor and bridge rectifier) are normal.
If
t
here is still something wrong, replace the whole set of external control unit; for the
control unit composed of several function boards, try disconnecting the weak-current
data wires among several control boards and then power the external unit on, if the
main control panel can be powered on and initialized successfully, then it’s the
module panel
's
problem; if the main external control panel still cannot be powered on
and initialized, replace the main external control panel.
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