Daikin DCOM-LT/MB [5/10] English
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Daikin DCOM-LT/MB [5/10] English

Daikin DCOM-LT/MB [5/10] English
5DCOM-LT/MB Reference Manual
English
INSTALLATION
MOUNTING
21 If using the DIN rail supplied with the DCOM, mount the
DIN rail horizontally using two or more fasteners.
22 Align the module DIN mounting points with the top of the
DIN rail.
23 Pull down the black clip H with a suitable tool, align the
module vertically ush with the DIN rail and release the clip to
x the module to the DIN rail 24.
WIRING
POWER TERMINALS A
Connect the Power Terminals to a regulated power supply.
NOTICE: POWER SUPPLY
The DCOM-LT/MB requires a 15-24VDC regulated
power supply with a minimum supply current of 80mA.
Do not operate the DCOM outside of the specied
voltage range.
INFORMATION
Power terminals are polarity independent. 0V and +V
can be wired to either terminal.
P1P2 TERMINALS E
Connect terminals P1P2 to a compatible Altherma LT Master
Remote Controller, for example an MMI.
ALTHERMA 2 COMPATIBILITY
For Altherma 2 and EKRUCBL* / EKRUHML* the
DCOM can only be used with Remocon if LAN adaptor
is NOT connected.
Refer to Daikin documentation for more details on the
compatibility.
RS485 TERMINALS B
The DCOM RS485 Terminals are connected to an RS485
daisy-chained bus using a stranded twisted pair with overall
shield and drain wire. Terminals ‘+’ and ‘-’ must be connected
to matching terminals on other RS485 devices using the
twisted pair. Terminal ‘C’ must be connected to all other RS485
Common terminals using the drain wire. The shield should only
be earthed at one location.
LEDS AND SWITCHES
DIP SWITCHES J
Switch SW1 consists of 8 switches numbered SW1.1 to
SW1.8. Except for Smart Grid mode, Switches SW1.1 and
SW1.2 select the operating mode, and switches SW1.3 to
SW1.8 select the Modbus Address of the device 34. In the
case of Smart Grid Mode switches SW1.1 to SW1.4 select the
Smart Grid function, and switches SW1.5 to SW1.8 select the
Modbus Address of the device 34.
LES P Q R
LED ashing sequences are dened in 30 to 33.
INFORMATION: LED OPERATION AT POWER-UP
At power-up all LEDs illuminate for 2 seconds. LEDs
P, Q and R change from RED to GREEN and then
revert to the behaviour described in the following
sections for each LED.
Status LED P will then ash Yellow indicating Waiting
for Altherma Master. All other LEDs will initially be
o󰀨, until communications occurs on P1P2 or RS485
network.
STATUS LED P
Colour Pattern Meaning
YELLOW
31
Waiting for Altherma Master
YELLOW
32
Synchronising with Master
RED
31
Timeout Waiting for Master
GREEN
30
Master synchronised, No Fault
RED
30
Master synchronised,
Unit Fault
When the device powers up it starts in the Waiting for
Altherma Master status and the Status LED will ash
YELLOW slowly 31. When the Altherma master is detected
the Status LED will ash YELLOW fast 32 while synchronising
with the Altherma Master. When synchronisation is complete
the Status LED is GREEN or RED depending if a fault
condition exists, the LED will be o󰀨 for 1 second every 5
seconds to indicate normal operation 30.
Synchronisation can take up to 8 minutes. When synchronised,
if communications fails for 60 seconds then the DCOM reverts
to Waiting for Altherma Master status.
If synchronisation takes more than 10 minutes then the DCOM
will revert to Waiting for Altherma Master status and wait for
synchronisation to restart. If the DCOM remains in Waiting for
Altherma status for more than 3 minutes then the DCOM will
switch to Timeout Waiting for Master status and the Status
LED will ash RED 31.
ACNET LED Q
Colour Pattern Meaning
GREEN
33
Normal Communication
RED
33
Communications Errors
RED
30
Communications Failure
The ACNET LED will ash GREEN at irregular intervals when
a message is received to indicate normal communications 33.
If a communications error occurs the error will be indicated by
the LED ashing RED on each error. If the communications are
permanently in error then the LED will ash RED continuously
30.
RS485 LED R
Colour Pattern Meaning
GREEN
33
Normal Communication
RED
33
Communications Errors
RED
30
Communications Failure
The RS485 LED will ash GREEN at irregular intervals when
a message is received to indicate normal communications 33.
If a communications error occurs the error will be indicated by
the LED ashing RED on each error. If the communications are
permanently in error then the LED will ash RED continuously
30.

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