32 Rockwell Automation Publication 7000-TG002J-EN-P - March 2015
Chapter 1 Fault Messages
X Master VoltUnbal 120 The measured phase voltages (610) in the master bridge have
exceeded the value set in LineVoltUnbalTrp (P271) for the
duration set in LineVoltUnbalDly (P272).
• 1. CHECK TSN FUSING.
• 2. CHECK TSN FUSING.
• 3. CHECK TSN FUSING.
• Verify the VSB connections and tap settings, and check resistance of VSB board – Megger
board to confirm integrity.
• Check actual voltage values on the operator interface terminal for each bridge and the
total line voltage.
• Check for possible source voltage supply problems.
• Use multimeter and oscilloscope to check voltages on the drive voltage test points.
X Motor Current UB 100 The measured current unbalance on the drive output has
exceeded Mtr CurUnbal Trp (P208) for the duration set in
Mtr CurUnbal Dly (P214).
• Verify the current sensor wiring and burden resistors from the motor current sensors.
• Verify the HECS power.
• Check the output filter capacitors for balanced loading on all 3 phases.
• Investigate the possibility of motor winding or cabling problems.
X Motor Flux UB 99 The measured motor flux has exceeded the value in Mtr
FluxUnbalTrp (P585) for the duration set in Mtr FluxUnbalDly
(P586).
• Verify the VSB resistors are not open and that they are balanced.
• Check for shorted motor output filter capacitors.
• Check for a grounded phase on the drive system using a megger test.
• Verify the low voltage groundings in the low voltage control cabinet.
• Verify if the drive has an output transformer and is tuned for speed and flux regulators
with the transformer.
• Verify the ribbons cables between the voltage feedback and SCBL/SCBM boards.
X Motor Load Loss 104 The drive has detected a loss of load condition. This is
activated as a fault using the parameter Load Loss Detect
(P199), and the necessary setpoints are Mtr LoadLoss Lvl
(P246), Mtr LoadLoss Dly (P231), and Mtr LoadLoss Spd
(P259).
• Verify the parameter settings.
• Ensure that the load should not normally be in an unloaded condition.
• This is designed for applications likely to lose the load (downhole pump – hollow-shaft
motor) and we do not want to run with the loss of load.
X MotorNeut OvrVolt 98 The measured motor neutral to ground voltage in Mtr Neutral
Volt (P347) has exceeded the Mtr NeutVolt Trp (P189) setting.
This fault message indicates a ground fault in the drive
system, such as cable insulation failure or motor winding
insulation failure, DC link reactor, common mode choke
(CMC), Motor Filter Capacitors. The investigation of this fault
is to locate the component(s) which may have an insulation
failure.
• NOTE: In DTD drive the default trip setting MUST not be increased without
consulting with MV Tech Support.
• Remove motor cables from drive, then megger motor cables and motor.
• Verify Parameter settings are appropriate for AC line reactor or isolation transformer
drives, may not be set correctly during commissioning. See tech note PF7000_Gen-04,
Neutral Overvoltage Setup for 6P/PWM Drives
• Verify the integrity of the output filter capacitors, looking for shorts or signs of physical
damage.
• If this application is recently installed, parameter settings should be verified.
• Check each motor filter capacitor; capacitance should be equal to nameplate value.
• With motor cables disconnected, run IDC Test and see if drive still trips on same fault, this
indicates if fault stays with the drive or is at the motor cables or motor.
• It may be necessary to check the CMC and neutral resistor. If the neutral resistor is hot
while running IDC Test, then examine the CMC using tech note PowerFlex 7000_Gen-65
Testing Common Mode Choke
• Megger the input isolation transformer secondaries/input cables to ground.
• If dri
ve is a RPTX, the Isolation Transformer neutral should not be grounded. Check
electrical drawings to see grounding requirements of the system.
All Drive Types
PF7000A
PF7000B
PF7000C
Marine Drive
Heat pipe Drive
Fault Message Fault Code Description Recommended Action(s)
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