EWWQ090G ÷ EWWQ720L - R410A - Water-cooled scroll chillers
EWLQ090G ÷ EWLQ720L - R410A - Condenser less
EWHQ100G ÷ EWHQ400G - R410A - Heat pump scroll chillers
EWAQ- - R410A - Air-cooled scroll chillers
EWAQ- - R410A - Air-cooled scroll chillers
EWYQ- - R410A - Air-cooled scroll heat pumps
Air and Water cooled scroll chillers & heat pump
EWWQ - EWLQ - EWHQ
EWAQ - EWYQ
Air or Water cooled scroll chiller &
heat pump
D-EOMHW00107-15EN
6.1.4.3 Master Communication Alarm
This alarm, dual to the previous, displayed only on the Slave unit occurs every time that there is
communication error between Master and Slave.
The Slave unit works in local mode.
Bell icon is moving on Slave
controller’s display.
Led on the button 2 of the Slave
External HMI is blinking
String in the alarm list:
+Master CommAlm
String in the alarm log:
Master CommAlm
String in the alarm snapshot:
Master CommAlm
Check for cable integrity
Check the polarity +/- of the
connection cable between Master
and Slave
6.1.4.4 Slave X Missing
This alarm displayed on the Master unit occurs when there is a configuration error in the function
Master Slave
All system Master Slave cannot start
Bell icon is moving on Master
controller’s display.
Led on the button 2 of the Master
External HMI is blinking
String in the alarm list:
+Slave X Missing
String in the alarm log:
Slave X Missing
String in the alarm snapshot:
Slave X Missing
There is more than one unit
configured with the same address and
consequently the address in alarm is
not configured
Check all address assigned to each
unit of the master slave network
The parameter “M/S Num of Unit” is
set incorrectly
Verify that the number of unit set in
this parameter is the same of the
number of unit that really belong to
the Master Slave network
6.1.4.5 Master Missing
This alarm displayed on the Slave unit occurs when there is a configuration error in the function
Master Slave
All system Master Slave cannot start
Bell icon is moving on Slave
controller’s display.
Led on the button 2 of the Slave
External HMI is blinking
String in the alarm list:
+Slave X Missing
String in the alarm log:
Slave X Missing
String in the alarm snapshot:
Slave X Missing
There is more than one unit
configured with the same address and
consequently the address in alarm is
not configured
Check all address assigned to each
unit of the master slave network
The parameter “M/S Num of Unit” is
set incorrectly
Verify that the number of unit set in
this parameter is the same of the
number of unit that really belong to
the Master Slave network
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