ABB ACH550 series User Manual page 78

76
Fault
Fault Name In Panel
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 and Troubleshooting
E-Clipse Bypass Configurations for ACH550 Drives
Fault
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
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