Phase Sequencing Error
Phase sequencing error occurs when the servo drive detects incorrect motor phase connection order or timing mismatch between commanded and actual motor rotation direction. This fault prevents proper motor commutation and can cause reverse rotation, reduced torque, or drive protection activation. The error typically involves power module output stages and motor connection verification circuits.
Error Code
247
Severity
Warning
Equipment
Servo Drive
Manufacturer
Schneider Electric
Drive fault display shows F013 or phase sequence error code with drive entering safe stop mode
Motor rotates in opposite direction to programmed command despite correct position reference input
Servo drive power module status LEDs show alternating red-yellow fault pattern indicating phase protection active
AC voltmeter measurements between motor phases U-V, V-W, W-U show unbalanced readings beyond ±5% tolerance
Drive current monitoring displays asymmetrical phase currents with one phase reading 20-30% higher than others
Motor exhibits reduced torque output and excessive vibration during acceleration/deceleration cycles
Incorrect motor phase wire connections at drive output terminals U, V, W due to installation error
Motor cable phase conductor swap or cross-connection in junction boxes or cable routing
Power module IGBT gate driver failure causing incorrect switching sequence on one or more phases
Drive parameter configuration error with incorrect motor pole count or commutation angle settings
Encoder feedback signal phase relationship error due to mounting misalignment or wiring transposition
Internal drive firmware corruption affecting commutation timing algorithms and phase control logic
Apply LOTO isolation procedures - disconnect all power sources and verify zero energy with calibrated test equipment
Verify correct motor phase connection sequence by checking U-V-W wire colors and terminal markings against drive manual
Measure motor phase-to-phase resistance using precision ohmmeter - all three readings should be within 2% of each other
Test power module output using oscilloscope to verify proper 120-degree phase-shifted PWM signals during slow jogging
Check and correct drive motor parameters including pole pairs, rated current, and encoder resolution settings
Replace power module assembly if IGBT gate driver circuits show failure or if phase output voltages are incorrect
Perform drive auto-tuning sequence to verify correct phase relationship and commission system with test movement
Safety First: Always isolate power and follow LOTO (Lockout/Tagout) procedures before working on electrical components. If unsure, contact a certified repair technician.
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