Troubleshooting
3-7
7000-TD002A-EN-P – September 2007
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION
RECOMMENDED ACTIONS
Current Sensor
155
This fault is detected in either DC Test Mode
or Open Loop test mode or during auto tune.
This indicates that there is a problem with
the current feedback in the drive. There are
three different current sensors: Line side
CT, DC Link HECS and Motor HECS. To
ascertain the cause of the fault check Cur
Sens FltCode (P764) under Diagnostic
group. Corresponding bit and its
troubleshooting guide should be followed.
– 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.
–
Make sure hardware parameters are
correct and do not exceed the range.
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