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