ABB ACH550-UH HVAC User Manual

72 ACH550 Installation, Operation and Maintenance Manual
ACH550 E-Clipse Bypass
Alarm listing
The following table lists the alarms by code number and describes each.
Alarm
Code
Alarm Name In
Panel
Alarm Possible Cause Corrective Action
4001 INP PHASE A
LOSS
Alarm will occur in drive
mode. In bypass,
alarm will occur if
bypass contactor has
not closed. Unit will trip
on Fault 3010 if the
bypass contactor is
closed
Loose J8 connector
Loose wiring on
Contactor assembly.
Blown upstream fuse
Check J8 connector
Check yellow wire on
input block
Check incoming
voltage, phase to
ground
4002 INP PHASE B
LOSS
Alarm will occur in drive
mode. In bypass,
alarm will occur if
bypass contactor has
not closed. Unit will trip
on Fault 3011 if the
bypass contactor is
closed
Loose J8 connector
Loose wiring on
Contactor assembly.
Blown upstream fuse
Check J8 connector
Check black wire on
input block
Check incoming
voltage, phase to
ground
4003 INP PHASE C
LOSS
Alarm will occur in drive
mode. In bypass,
alarm will occur if
bypass contactor has
not closed. Unit will trip
on Fault 3012 if the
bypass contactor is
closed
Loose J8 connector
Loose wiring on
Contactor assembly.
Blown upstream fuse
Check J8 connector
Check red wire on input
block
Check incoming
voltage, phase to
ground
4004 AUTO TRANSFER Message is displayed
when the drive faults
and the bypass
switches to bypass
mode as configured in
Parameter 1608
Drive fault Check drive
4005 EXT COMM ERR Time between fieldbus
messages has
exceeded timeout
interval set with
parameter 3005
Incorrect
Communication
settings in Group 51 &
53.
Poor Connections
Noise on
Communication Line
Check Group 51& 53
Tighten Connections
Check Communication
Cable Grounding
4006 Selected by PAR
1620:
RUN ENABLE
DAMPER END
SWITCH
VALVE OPENING
PRE-LUBE CYCLE
Alarm will occur when
start order is given and
the “RUN Enable” is not
present
Run Enable condition is
not satisfied.
Bad 24v supply
Bad digital input
Check 24 Volts on
RBCU unit
Check for 24 volts on
respective DI when
condition is satisfied
Check Parameter 0103
for status of digital input
4007 PCB TEMP RBCU unit reached
181 degrees
Fahrenheit, 83 degrees
Celsius
Cabinet cooling has
failed
Ambient conditions too
high
Bad RBCU unit
Stop drive and let cool
down and restart
Add additional cooling
Replace RBCU

ABB ACH550-UH HVAC Specifications

General

Brand	ABB
Model	ACH550-UH HVAC
Category	Controller
Language	English