Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 490)

7-6 Troubleshooting
7000L-UM300I-EN-P – June 2013 7000 “C” Frame
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
Current Sens 178 Current Sensor fault – If you have the Line HECS/CT code, the
line current measurement is not what is
expected at this level of dc current.
Either of the CT DC HECS and there
burden resistors may be damaged or
programmed incorrectly. For example,
the DC HECS may actually be 2500:1,
the drawings and parameters indicate
4000:1. Another cause would be an
unplugged DC HECS.
– If you have the CT Phs Seqn code, the
CTs are likely swapped. For example the
CT/wiring for 2U has been switched with
2W.
– If you have the CT Phs/Alpha code, the
rectifier is firing with the wrong firing
angle relative to the angle measured
from the line current. This can occur
when the CTs on an 18-pulse rectifier are
switched between master and slaves.
– If you have the Cap/CT Error code, this
only occurs for PWM rectifiers when
energized and not running. The line
current measured by the CTs does not
match the expected line current based
on the capacitor parameters and
measured voltage. Possible causes are
incorrect capacitor, CT or burden resistor
parameters, and in some cases, blown
TSN fuses.
– If you have the Motor HECS code, this
only occurs when running on the motor in
open loop mode. The drive compares the
motor current to the dc current, and flags
this fault if there is a significant difference.
If there were no Line HECS/CT codes,
then the likely cause of this fault in an
incorrectly programmed motor HECS
value or burden resistor. Other causes
could be a defective or unplugged motor
HECS.
DAN Comm 45 Drive Area network communication fault.
This is applicable to parallel drive only – Check RS485/RS232 converter. Red
LED should be steady, and green and
yellow transmit and receive LEDs should
be flashing.
– Check RS485 cable between drives
– Check RS232 cable between Inverter
Drive Control Board and serial converter