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

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