ABB ACH550-UH User Manual page 574

2-228
Fault
Code
3020 PHASE SEQ
3021 PH A CURR FBK
3022 PH C CURR FBK
3023 BYP COIL
SHORTED
3024 DRV COIL
SHORTED
3027 INVALID SUB
ASM
3028 EXT COMM LOSS
3029 EFB CONFIG
FILE
3030 FORCE TRIP
Diagnostics
Fault Name In
Panel
Sequence of 3 phase
voltage input is such
that bypass operation
will result in motor
rotation opposite of
drive forward
operation.
Fault is generated
when current in Phase
A is detected and the
bypass contactor is
open
Fault is generated
when current in Phase
C is detected and the
bypass contactor is
open
Coil characteristics
are checked only on
power up and coil
current is greater than
allowable values
Coil characteristics
are checked only on
power up and coil
current is greater than
allowable values
Contactor assembly
as recorded in the
RBCU unit does not
match drive
information
communicated via 485
link
Time between fieldbus
messages has
exceeded timeout
interval set with
parameter 3005
Error reading
configuration file for
embedded fieldbus
Fault trip forced by
external fieldbus
ACH550 E-Clipse Bypass User's Manual
Fault Possible Cause
Phase sequence
unknown at time of
wiring
Loose CT connection
Bad RBCU
Bad CT
Loose CT connection
Bad RBCU
Bad CT
Shorted contactor coil
Shorted/damaged
cable
Bad RBCU
Shorted contactor coil
Shorted/damaged
cable
Bad RBCU
RBCU unit from a
different size bypass
used to replace a
defective RBCU.
Parameters not
matched after
Firmware change.
Incorrect
Communication
settings in Group 51 &
53.
Poor Connections
Noise on
Communication Line
Internal Startup error
Overriding Control
System tripped
E-Clipse unit via
fieldbus.
Corrective Action
Swap any two of the
three input wires to the
bypass unit
Check J2 connector
for proper seating
Check connector on
Current Assembly
Replace RBCU
Replace RCSA unit
Check J2 connector
for proper seating
Check connector on
Current Assembly
Replace RBCU
Replace RCSA unit
Replace RBCU
Replace RCSA unit
Replace RBCU
Replace RCSA unit
Contact ABB at
1-800-HELP-365
Option 4
Check Group 51 & 53
Tighten Connections
Check
Communication Cable
Grounding
Cycle Power
Replace RBCU
Check Overriding
Control System