Hitachi SJ-P1 Fault Codes List

Troubleshoot your Hitachi SJ-P1 high-performance inverter with our updated guide. Learn to interpret E001-E110 trips, use ProDriveNext, and resolve common hardware faults.

SJ-P1 Fault Codes Reference Table

Below is the complete list of protective functions and alarm codes for the SJ-P1. Please refer to this table to match the alphanumeric code on your display with the specific hardware or load issue.

Hitachi SJ-P1 Fault Codes List

Hitachi SJ-P1 Fault Codes List

Fault Code and Meaning Cause and Remedy
E001

Overcurrent error		 Cause:
  • A steep load change occurred or motor hunting.
  • Insufficient acceleration or deceleration time.
  • Output line short-circuit, ground fault, or motor lock.
  • System environment changes or aging deterioration.

Remedy:
  • Adjust Overcurrent suppression [bA120] or Overload limit [bA122].
  • Increase acceleration time [FA-10] or deceleration time [FA-12].
  • Check wiring and motor insulation.
  • Clean fans/ducts or reduce motor load.
E005

Motor overload error		 Cause:
  • Operation under heavy load continued.
  • Thermal level setting [bC110] is incorrect.
  • Insufficient acceleration torque or load inertia is large.
  • Overvoltage suppression function is active causing current increase.

Remedy:
  • Re-examine operation/load conditions.
  • Adjust motor thermal level setting [bC110].
  • Increase acceleration [FA-10] or deceleration [FA-12] time.
  • Clean cooling fan/ducts if environment is hot.
E006

Braking resistor overload error		 Cause:
  • Insufficient deceleration time.
  • Load inertia is large or capacity of braking resistor is small.
  • Continuous regenerative operation or external force rotating the motor.

Remedy:
  • Set longer deceleration time in [FA-12].
  • Re-examine choice of resistor capacity.
  • Reduce repetition cycle of operation.
E007

Overvoltage error		 Cause:
  • Power supply voltage fluctuation.
  • Large load inertia causing high regenerative power.
  • Motor rotated by external force (fan, crane).
  • Mutual interference from two inverters on the same shaft.

Remedy:
  • Check power supply; consider AC reactor.
  • Enable overvoltage suppression [bA140]/[bA146].
  • Use a braking resistor, braking unit, or regenerative converter.
  • Increase deceleration time [FA-12].
E008

Memory error		 Cause:
  • Noise interference.
  • Power-off occurred during memory access.

Remedy:
  • Install noise shielding plates.
  • Restore data from keypad backup or initialize inverter.
  • If initialization fails, repair is required.
E009

Undervoltage error		 Cause:
  • Power supply voltage decreased or power failure.
  • PS capacity insufficient.
  • Contact fault in circuit breaker.
  • Capacitor deterioration or circuit failure.

Remedy:
  • Re-examine power supply environment.
  • Use retry function if failure was temporary.
  • Check magnetic contactor/breaker. Repair if necessary.
E010

Current detector error		 Cause:
  • Current detector circuit is broken.
  • Noise source is nearby.

Remedy:
  • If error recurs after reset, repair is required.
  • Implement noise countermeasures (shielding).
E011

CPU error		 Cause:
  • Internal CPU malfunction.
  • Noise source nearby.
  • Data inconsistency during writing.

Remedy:
  • Reset, power cycle, or initialize the inverter.
  • If no recovery, CPU is broken (repair required).
  • Use shielding plates against noise.
E012

External trip error		 Cause:
  • External device triggered the trip signal.
  • Terminal logic reversed or wiring wrong.

Remedy:
  • Check external device status.
  • Verify input terminal assignment and A/B contact settings.
E013

USP error		 Cause:
  • Operation command entered immediately upon power ON (within 1-2 seconds).
  • Operation command was not released before power ON.

Remedy:
  • Wait 2 seconds or longer after power ON to enter operation command.
  • Release operation command (switch off) before turning on power.
E014

Ground fault error		 Cause:
  • Ground fault in wires or motor.
  • Motor insulation deterioration.

Remedy:
  • Turn OFF power. Disconnect motor wires. Check motor/wires.
  • Do not turn ON power while ground fault exists.
E015

Incoming overvoltage error		 Cause:
  • Incoming voltage is too high.
  • Power supply has become unstable.

Remedy:
  • Re-examine power supply environment.
  • Check for facility replacements causing voltage changes.
E016

Instantaneous power failure error		 Cause:
  • PS voltage decreased due to power failure.
  • Contact fault in circuit breaker.

Remedy:
  • Check power supply capacity.
  • Check magnetic contactor/breaker.
E019

Temperature detector error		 Cause:
  • Temperature detector circuit disconnected or broken.

Remedy:
  • Repair is required (circuit broken).
E020

Cooling fan rotation speed reduction error		 Cause:
  • Foreign object stuck in fan.
  • Fan end of life.

Remedy:
  • Remove foreign object.
  • Replace cooling fan.
E021

Temperature error		 Cause:
  • High carrier frequency.
  • Clogged heatsink fins.
  • High ambient temperature or poor ventilation.
  • Improper installation.

Remedy:
  • Lower carrier frequency setting.
  • Clean the fins.
  • Improve cooling environment.
  • Install according to manual.
E024

Input open-phase error		 Cause:
  • Input line/motor loose connection.
  • Single-phase input used on 3-phase setting.

Remedy:
  • Check input lines and breaker terminals. Tighten screws.
  • Use three-phase connection.
E030

IGBT error		 Cause:
  • Ground fault, short circuit, or output element failure.
  • Motor rotation locked.

Remedy:
  • Disconnect motor and check wires/insulation.
  • Remove cause of motor lock.
  • If element broken, repair required.
E034

Output open-phase error		 Cause:
  • Output line/motor loose connection or disconnected.
  • Motor insulation breakdown.

Remedy:
  • Check output wiring and motor condition.
  • Re-tighten screws.
E035

Thermistor error		 Cause:
  • Motor overheated (cooling insufficient or heavy load).
  • Inadequate thermistor setting.
  • Thermistor broken or noise interference.

Remedy:
  • Improve cooling or reduce load.
  • Check thermistor settings and wiring.
  • Separate wiring to reduce noise.
E036

Brake error		 Cause:
  • Disconnection of brake check signal line.
  • Brake function setting (timing/logic) incorrect.

Remedy:
  • Check signal wiring.
  • Re-examine brake check waiting time and logic.
E038

Low-speed range overload error		 Cause:
  • Motor load is heavy at low frequency (0.2Hz or below).

Remedy:
  • Reduce load at low-speed range.
  • Select larger capacity inverter if frequent.
E039

Controller (inverter) overload error		 Cause:
  • Operation under heavy load continued.
  • Insufficient acceleration torque.
  • Load inertia is large.

Remedy:
  • Check load condition.
  • Adjust boost function [Hb141] or control method.
  • Increase accel/decel time.
E040

Operator keypad communication error		 Cause:
  • Loose connection/disconnection.
  • Noise interference.

Remedy:
  • Check wiring/connection.
  • Take noise countermeasures (wiring separation).
E041

RS485 communication error		 Cause:
  • Loose connection/disconnection.
  • Noise interference.

Remedy:
  • Check wiring.
  • Take noise countermeasures.
E042

RTC error		 Cause:
  • Keypad battery runs out.

Remedy:
  • Replace battery and set date.
E043

EzSQ illegal instruction error		 Cause:
  • Program not entered or writing error due to noise.

Remedy:
  • Write program after initialization.
  • Avoid noise during writing.
E044

EzSQ nest count error		 Cause:
  • Program structure too complicated (nesting > 8 times).

Remedy:
  • Improve program structure.
E045

EzSQ executive instruction error		 Cause:
  • Program flow inadequate (invalid "for/next/goto").
  • Math overflow/underflow/div by zero.
  • Non-existing parameter accessed.

Remedy:
  • Check program logic and arithmetic operations.
  • Check parameter instructions.
E050 to E059

EzSQ user-assigned errors		 Cause:
  • Program triggered a user-assigned error instruction.

Remedy:
  • Check content of trip instruction in EzSQ program.
E060 to E089

Option 1/2/3 errors		 Cause:
  • Option not securely mounted.
  • Option used incorrectly.

Remedy:
  • Check option mounting.
  • Refer to specific option manual.
E090 to E096

STO path / FS option error		 Cause:
  • Safety function system has problems.

Remedy:
  • Refer to "Functional Safety Guide".
E100

Encoder disconnection error		 Cause:
  • Feedback option error.

Remedy:
  • Refer to P1-FB user's guide.
E104

Position control range error		 Cause:
  • Position counter exceeded range.
  • Improper electronic gear or encoder setting.
  • Slipping due to mounting.

Remedy:
  • Recheck electronic gear/encoder settings.
  • Check encoder mounting.
E105

Speed deviation error		 Cause:
  • Deviation between frequency command and feedback speed.
  • Improper encoder/gear setting.

Remedy:
  • Re-examine load conditions.
  • Check encoder/gear settings.
E106

Position deviation error		 Cause:
  • Position feedback deviation exceeds limit.

Remedy:
  • Re-examine load conditions.
  • Check encoder/gear settings.
E107

Over-speed error		 Cause:
  • Speed exceeded detection level.

Remedy:
  • Re-examine operation/load conditions.
  • Check encoder/gear settings.
E110

Contactor error		 Cause:
  • Wiring defect in intelligent input.
  • Contactor response defect.

Remedy:
  • Check setting and wiring of intelligent input.
  • Check contactor operation and response time.
E112

Feedback option connection error		 Cause:
  • Connection error related to feedback options.

Remedy:
  • Refer to P1-FB user's guide.
 

How to Read SJ-P1 Faults via ProDriveNext & Mobile App

The Hitachi SJ-P1 offers the most advanced diagnostic suite in Hitachi’s lineup. For 2026 maintenance standards, using the digital interfaces provides far more detail than the keypad alone.

  • Trip History (d081 to d090): The SJ-P1 records up to the last 10 trip events. Navigate to parameter d081 to see the most recent fault. Parameters d082 through d090 store previous history.
  • ProDriveNext PC Software: Connect your PC via the built-in USB port. This allows you to view the “Fault Monitor” window, which displays high-resolution data traces of current and voltage 500ms before the trip occurred.
  • Smartphone App: If you have the optional Bluetooth/Wireless keypad, use the Hitachi Inverter Mobile app to scan the drive status and instantly pull up troubleshooting steps on your phone.

General Troubleshooting Steps

Before performing a manual reset on your Hitachi SJ-P1, perform these essential hardware checks:

  1. Overcurrent (E001 – E004): If this occurs during acceleration, check parameter AC1. The SJ-P1 features very fast response times; if the motor is hunting, you may need to adjust the current loop gains.
  2. Overvoltage (E007): Common with high-inertia loads. Check the DC bus voltage in d005. If the load is overhauling, ensure your braking resistor is correctly sized and parameter bA-60 (Braking Resistor Selection) is enabled.
  3. Ground Fault (E014): The SJ-P1 uses advanced sensors to detect output leakage. Disconnect the motor leads and megger the motor. Warning: Repeatedly resetting a ground fault can cause catastrophic damage to the drive’s output power modules.

Frequently Asked Questions (FAQ)

Q: How do I reset a fault on the Hitachi SJ-P1?

A: Once the cause of the trip has been cleared, you can reset the inverter using these methods:

  • Press the Stop/Reset key on the digital operator.
  • Activate the digital input terminal assigned to the RS (Reset) function.
  • Cycle the main input power (Wait for the LCD to turn off and the internal charge light to extinguish before turning power back on).

Q: What is the “USP” error on my Hitachi SJ-P1?

A: USP (Unattended Start Protection) is a safety feature. It prevents the motor from starting automatically if the Run command is already active when the drive receives power. Simply turn the Run command OFF to clear the message.

Q: Why does my drive show “E009” (Under-voltage)?

A: E009 indicates the DC link voltage is below the minimum limit. This is often caused by a lost input phase, a blown fuse, or a sag in the plant’s power grid during heavy machine startups.

Q: Where is the fault history located on the keypad?

A: Navigate to the Monitor (d-group) menu. Parameters d081 through d090 display the 10 most recent faults. Each entry provides a snapshot of the electrical data at the time of the event.

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