Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
64/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
Reset
Notes
Local HMI
Network
Auto
6.3.10 OptionCtrlrCommFail (A/C units only)
This alarm is generated in case of communication problems with the AC module.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped immediately.
Bell
icon is moving on controller’s display.
String in the alarm list:
OptionCtrlrCommFail
String in the alarm log:
OptionCtrlrCommFail
String in the alarm snapshot
OptionCtrlrCommFail
Module has no power supply
Check the power supply from the
connector on the side of the module.
Check if LEDs are both green.
Check if the connector on the side is tightly
inserted in the module
Module address is not properly set
Check if module’s address is correct
referring to the wiring diagram.
Module is broken
Check if LED are on and both green. If
BSP LED is solid red replace the module
Check if power supply is ok but LEDs are
both off. In this case replace the module
Reset
Notes
Local HMI
Network
Auto
6.3.11 Power Fault (only for A/C units with the UPS option)
This alarm is generated when the main power is Off and the unit controller is powered by the UPS.
Resolution of this fault requires a direct intervention on the power supply of this unit. Direct intervention on the
power supply can cause electrocution, burns or even death. This action must be performed only by trained
persons. In case of doubts contact your maintenance company.
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped immediately. Bell
icon is moving on controller’s display.
String in the alarm list:
Power Fault
String in the alarm log:
Power Fault
String in the alarm snapshot
Power Fault
Loss of one phase.
Check voltage level on each of the phases.
Not correct sequence connection of
L1,L2,L3.
Check sequence of L1, L2, L3 connections
according indication on chiller’s electrical
scheme.
Voltage level on the unit’s panel is not in the
allowed range (±10%).
Check that voltage level on each phases is
into the allowed range that is indicated on
the chiller label.
Is important to check the voltage level on
each phases not only with chiller not
running, but mainly with chiller running
from minimum capacity up to full load
capacity. That's because voltage drop can
occur from a certain unit cooling capacity
level, or because of certain working
condition (i.e. high values of OAT);
In these cases the issue can be related
with the sizing of power cables.
There is a short-circuit on the unit.
Check for correct electrical isolation
condition of each unit’s circuit with a
Megger tester.
Reset
Notes
Local HMI
Network
Auto
6.3.12 PVM alarm (A/C units only)
This alarm is generated in case of problems with the power supply to the chiller.
Resolution of this fault requires a direct intervention on the power supply of this unit.
Direct intervention on the power supply can cause electrocution, burns or even death. This action must be
performed only by trained persons. In case of doubts contact your maintenance company.