Rockwell Automation Publication 7000-TG002J-EN-P - March 2015 17
Fault Messages Chapter 1
X 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.
X DAN Comm Loss 456 This is applicable to parallel drive systems. Drive Area
Network (DAN) communication fault. The communication
between drives used in a parallel drive system communicates
over the DAN link. This fault indicates a loss of the DAN link for
a drive acting as a Slave. This would result in the slave drive
stopping.
• 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 ACB board and serial converter.
• Previous issue required the replacement of the RS232 to RS485 converter (MOXA)
All Drive Types
PF7000A
PF7000B
PF7000C
Marine Drive
Heat pipe Drive
Fault Message Fault Code Description Recommended Action(s)
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