ABB ACH550-VCR - Page 67

ACH550 Installation, Operation and Maintenance Manual 67
ACH550 E-Clipse Bypass
3004 BYPASS COIL
OPEN
M2 contactor will not
close when
commanded to do so
Loose J8 connector on
RBCU
Loose wires on
contactor terminals A1
and/or A2
Bad Output on RBCU
Bad Contactor
Verify that J8 connector
is firmly seated.
With incoming power
disconnected, check for
tightness of A1 and A2
terminals
Swap RBCU
Change Contactor/
Assembly
3005 DRIVE COIL OPEN M1 contactor will not
close when
commanded to do so
Loose J8 connector on
RBCU
Loose wires on
contactor terminals A1
and/or A2
Bad Output on RBCU
Bad Contactor
Verify that J8 connector
is firmly seated.
With incoming power
disconnected, check for
tightness of A1 and A2
terminals
Swap RBCU
Change Contactor/
Assembly
3006 UNDERVOLTAGE Message only occurs if
drive is controlling the
motor and the power to
the bypass is removed
before the drive phases
back. Message will
appear in the fault log.
This message will only
appear when drive
contactor opens when
drive is operating
Loose J7 connector on
RBCU unit
Loose input wiring
Incoming power
problems
Check that J7
connector is firmly
seated in RBCU
Check tightness of
incoming connections
Check Parameter 0413
to view voltage level at
time of trip
Check upstream
protection
3008 DRIVE AI2 LOSS Only displayed when in
Supervisory mode.
Indicates that AI2 on
the drive has failed.
Check ACH550 manual
for AI2 loss
Check ACH550 manual
for AI2 loss
3009 MTR OVERLOAD Bypass opens on motor
overload conditions
defined in the drive
Drive Mode:
Bad Motor
Bad CT’s
Bad RBCU
Bypass mode:
Bad motor
Bad CT’s
Bad RBCU
Either mode:
low input voltage
Check if overload
condition exists
Drive Mode:
Refer to 550 manual
for proper
troubleshooting
techniques
Bypass Mode:
Check that J2
connector is firmly
seated in RBCU
Use clamp meter to
verify mtr current vs.
display in parameter
0101
Check input voltage
Fault
Code
Fault Name In
Panel
Fault Possible Cause Corrective Action