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E (Emergency Stop) Emergency Stop / Force Stop fault in Toshiba drive Description This is technically not a hardware failure but a status trip. The drive has been commanded to stop immediately via an external safety circuit or a specific logic input assigned to "Emergency Stop." Unlike a standard stop which follows a deceleration ramp, an E-trip usually cuts output immediately (coast to stop) or slams the motor to a halt depending on configuration. Causes 1. External Button: An operator pressed the E-Stop mushroom button. 2. Broken Wire: The safety circuit (normally closed loop) has a loose wire or break, simulating a button press. 3. Logic Conflict: A PLC or automation system sent a contradictory command or a specific logical input programmed as "E" was triggered. 4. Panel Keypad: The Stop key on the keypad was press...

EEP (EEP1, EEP2, EEP3) EEPROM Error / Data Write Error fault in Toshiba drive Description The EEPROM is the memory chip where all your parameter settings are stored. An EEP fault means the data on this chip has become corrupted, or the chip itself has physically failed. It can also occur if power is cut exactly while the user is saving a parameter. EEP1 usually means a data write error, while EEP2/3 can imply initial data corruption or hardware issues. Causes 1. Power Loss during Save: Turning the drive off while the display says "Writing". 2. Electrical Noise: Extreme EMI/RFI noise on the control cables corrupting the data bus. 3. Aging Component: Flash memory has a limited number of write cycles (usually 100,000+), though rare, it can wear out in automated systems that write parameters continuously via comms. 4. Control Board ...

Err (Err1 to Err9) Communication / Connection Error fault in Toshiba drive Description These faults indicate a breakdown in communication between the drive and an external controller (PLC, HMI, SCADA) or between the drive's main board and keypad. Err4 or Err5 are common for CPU errors or Modbus timeouts. It means the drive expected a "heartbeat" signal from the PLC but didn't receive it within the set timeout period. Causes 1. Wiring Issues: Broken RS485 wires, crossed A/B terminals, or loose shielding. 2. Noise/Interference: running communication cables next to high voltage motor cables without shielding. 3. Termination: Lack of termination resistors (120 ohm) at the end of the daisy chain. 4. Parameter Mismatch: Baud rate, Parity, or Station ID does not match the PLC configuration. 5. Timeout S...

UC Undercurrent / Low Current Detection fault in Toshiba drive Description The UC fault indicates that the motor current has dropped below a user-defined threshold for a specific amount of time while the drive is running. Unlike Overcurrent (which protects the drive), Undercurrent is an application protection feature designed to save the mechanical system. It essentially means "The motor is spinning, but it isn't doing any work." This is critical in pumping applications (to prevent cavitation or running dry) and HVAC (to detect broken belts). Causes 1. Pump Dry Run: The intake tank is empty, or there is an airlock in the pipe. The impeller spins freely in air, drawing very little current. 2. Broken Transmission: A drive belt has snapped, or a shaft coupling has sheared. The motor is spinning unconnected to the load. 3. Closed Valve: A discharge val...

Ot Over-Torque Detection fault in Toshiba drive Description Ot is the opposite of UC. While OL (Overload) measures thermal heat accumulation over time, Ot is an instantaneous or short-delay torque limit trip. It acts as an electronic shear pin. It is used to protect machinery from physical damage when a jam occurs, often tripping faster than a thermal overload would. It signifies that the mechanical load has spiked unexpectedly, even if the current hasn't exceeded the absolute drive rating (OC). Causes 1. Mechanical Jam: A conveyor has a rock stuck in it, or a shredder has encountered an unshreddable object. 2. Brake Failure: The mechanical holding brake (on a hoist or elevator) failed to release, and the motor is trying to drag the locked brake. 3. Lubrication Failure: Bearings or gearboxes have seized up. 4. Acceleration settings: ...

E-10 / E-11 / Loss of AI Analog Input Signal Loss fault in Toshiba drive Description This fault occurs when the drive is set to receive a speed reference from an external source (like a PLC providing 4-20mA or 0-10V) and that signal drops below a minimum threshold. For a 4-20mA signal, if the current drops to 0mA or 2mA, the drive infers a "Broken Wire" condition. It is a safety feature to prevent the drive from acting unpredictably when control is lost. E-10 usually refers to the VI input (Voltage) and E-11 to the II input (Current), depending on the model. Causes 1. Broken Wire: The signal cable from the PLC or potentiometer has been cut or disconnected. 2. Source Failure: The PLC analog output card has failed or lost power. 3. Loose Terminal: The screw on the terminal block (CC, VI, II/RR) is loose. 4. Dip Switch Mismatch: T...

Atn (Atn1, Atn2, Atn3) Auto-Tuning Error fault in Toshiba drive Description This fault appears during the commissioning phase when performing an "Auto-Tune." Auto-tuning is when the drive injects current into the motor to measure resistance, inductance, and leakage to build a mathematical model for precise control (Vector Control). The fault means the drive failed to complete this measurement cycle. It is not a hardware failure of the drive, but a procedure failure. Causes 1. Motor Connected to Load: Rotational auto-tuning was attempted while the motor was connected to a heavy load or a gearbox with high friction. 2. Circuit Open: The motor disconnect switch is open, or a wire is loose during the tune. 3. Mismatch: The motor size entered in the parameters is drastically different from the connected motor (e.g., programming a 10HP drive for a 1HP motor)...