30 Rockwell Automation Publication 7000-TG002J-EN-P - March 2015
Chapter 1 Fault Messages
XLine Capacitor
Failure
136 The drive has detected a possible line capacitor failure. This
fault cannot be reset unless a specific code is entered. This is
to ensure that before re-energizing the drive, all necessary
checks and troubleshooting steps have been carried out as
described in the user manual.
• Check the integrity of the line filter capacitors (applies to AFE drives only) by following the
test procedure as described in the user manual.
• For detailed instructions on capacitor testing and the procedure to reset the line capacitor
fault:
– Firmware 9.002 and higher – use link to access Knowledgebase ID 221486 (http://
rockwellautomation.custhelp.com/app/answers/detail/a_id/221486)
– Firmware 7.00x and 8.00x – use link to access Knowledgebase ID 66655
(http://rockwellautomation.custhelp.com/app/answers/detail/a_id/66655)
• See Tech Note PF7000_Gen-99, Resetting Line Filter Capacitor (LFC) Fault
Throughout all Firmware Revisions, which provides a summary of reset procedures for
Classic and Forge, for all revision level of software.
• For drives which are RPTX, upgrading to firmware 9.002 and higher may introduce this
lockout fault. Line CT location should be examined. Review tech note Nuisance Line Filter
Cap fault in PowerFlex 7000 Drives with Isolation Transformer—RPTX
PF7000_4GEN_GEN-27
• Check the CT connections (J2) are not reversed and properly installed (no offset)
• Check the CT open circuit resistance value. For a 1000:1 CT the open circuit resistance
should be 3.9. The tolerance is 1%. If one CT or both CTs are below this value, replace
the CTs to correct the unbalance.
• After resetting the line capacitor lockout, the Fault Queue must be cleared, otherwise, the
line capacitor lockout will be triggered every time the control power is cycled.
• Line overcurrent will trigger this lockout protection; investigate possible causes of
overcurrent such as a short circuit, multiple rectifier SGCTs failing.
• Firmware 9.003 and higher. XIO Input #2 is dedicated to the LFC protection. If this
input is at logic 0, then LFC Lockout will occur. Examine how this input is used in the drive
application and modify as necessary. In firmware 9.003 and higher this input is dedicated
to line filter capacitor protection and must be logic 1 to inhibit the fault from occurring.
• Firmware 9.004 and higher. Check line current against line to neutral trip current,
which is estimated using the filter cut-off frequency (P192) and line cap pu (P133) values.
If the drive trips on a nuisance Line Capacitor Failure from high line to neutral current
during energization, then the unbalance ratio (P951) can be increased to 2 in order to
increase the delay time of the logic.
X Line Harmonic OV 119 The drive has detected a steady-state resonance-induced
overvoltage on the line (P683). This is defined at the level set
in Harmonic VoltTrp (P675) for the delay Harmonic VoltDly
(P676) (on top of normal line voltage) for 1 second. The drive
only detects the 5
th
harmonic to eliminate nuisance faults
from capacitor charging events.
• Verify waveforms show excessive harmonics using oscilloscope on ACB unfiltered voltage
testpoints.
• Investigate sources for excessive harmonics on customer power system.
• P675 Harmonic VoltTrp has a default of 15% for the trip setting, it can be increased to 30%
in multi drive applications
• Contact factory for possible re-tuning of input filter.
X LineNeut OvrVolt 118 The line side neutral voltage (calculated from line to ground
voltages for SCR rectifiers and measured from the capacitor
neutral point for PWM rectifiers) displayed in LineNeutral Volt
(P589) has exceeded the trip settings. Verify parameter
settings. Check the system grounding and megger the input
cables to ground.
• Insulation Failure – Megger the motor insulation/motor cables/drive insulation to ground.
• If the grounding network is NOT connected to the line cap neutral then the trip level can
be increased from default 0.4 pu to a higher value.
• NOTE: In DTD drive the default trip setting MUST not be increased without
consulting with MV Tech Support.
• Verify the integrity of the input grounding network if applicable.
• Megger the input isolation transformer secondary/input cables to ground.
• Verify Parameter settings are appropriate for AC line reactor or isolation transformer
drives. See tech note PF7000_Gen-04, Neutral Overvoltage Setup for 6P/PWM Drives
All Drive Types
PF7000A
PF7000B
PF7000C
Marine Drive
Heat pipe Drive
Fault Message Fault Code Description Recommended Action(s)
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