Yaskawa F7 Drive

The speed search function has attempted to retry more times than allowed by the b3-19 parameter. This typically indicates that the speed search settings in b3-17 and b3-18 are not correctly configured for the application, preventing successful speed identification within the set limits.

After initial communication was established, the connection to the option board was lost. This indicates a broken connection or that the master controller stopped communicating, preventing data exchange.

Control data was not received correctly for two seconds, indicating a breakdown in Modbus communication. This fault occurs when H5-05=1 and H5-04=0 to 2, typically due to a broken connection or the master stopping communication.

A torque limit was continuously reached for 3 seconds or longer during a ramp to stop while operating in open-loop vector control. This fault typically indicates that the motor parameters are not correctly set, preventing the drive from controlling torque effectively.

Transmission between the Drive and the Digital Operator was not established within 5 seconds after supplying power. This indicates a potential issue with the Digital Operator cable, the operator unit itself, or a faulty control board within the Drive.

After communication started with the Digital Operator, it stopped for 2 seconds or more. This fault suggests issues with the Digital Operator cable, a defective operator unit, or a fault within the Drive's control board.

A baseblock circuit fault was detected during power-up, indicating a gate array hardware failure within the Drive. This is a critical internal component issue that prevents safe operation of the power stage.

The EEPROM check sum was not valid, indicating data corruption in the non-volatile memory. This can be caused by electrical noise or spikes on the control circuit input terminals, compromising the Drive's configuration data integrity.

A fault in the CPU's internal Analog-to-Digital converter was detected. This issue typically results from noise or electrical spikes on the control circuit input terminals, impairing the CPU's ability to accurately process internal analog signals.

A fault with the external Analog-to-Digital converter was detected. This problem is often caused by noise or electrical spikes on the control circuit input terminals, impacting the accurate conversion of external analog input signals.

The option board was not connected properly or has been damaged, indicating a problem with its physical integrity or functionality. This fault can also suggest damage to the Drive itself affecting the option board interface.

Control circuit failure or damage, specifically within the ASIC's internal RAM. This is a critical internal hardware fault indicating a memory integrity issue that can lead to unpredictable Drive behavior.

Control circuit failure or damage related to the watchdog timer. This critical internal hardware fault means the system's ability to monitor its own operation has failed, which can lead to unsafe conditions.

Control circuit failure or damage involving a mutual diagnosis fault between the CPU and ASIC. This is a critical internal hardware fault affecting the core processing units and indicates a severe internal malfunction.

Control circuit damage, specifically an ASIC version fault. This indicates an incompatibility or corruption within the ASIC firmware or hardware itself, preventing proper drive functionality.

An input fault on the option board or an A/D converter fault on the option card. This indicates a problem with the option board's ability to process analog inputs or a fault with its internal converter, affecting external sensor readings.

A self-diagnosis fault was detected on the option board, potentially due to noise or spikes on the communication line or a defective option board itself. This indicates an internal issue with the option board's CPU, impacting its operation.

An unrecognizable option board was connected to the control board, indicating an incompatible or incorrectly installed option board. The Drive cannot identify or communicate with the attached board, leading to system errors.

An option board was not correctly connected to the control board, or an incompatible option board was attached. This fault indicates a problem with the physical interface or compatibility between the option and control boards, preventing data exchange.

This fault occurs in Flux Vector control (A1-02=3) when the actual motor speed deviates from the reference speed by more than the F1-10 setting for longer than the F1-11 time. It often indicates a locked load or an inability for the motor to follow its command. Unresolved, this can lead to poor process control, mechanical stress on the system, or motor overheating due to sustained effort.

A communication error has occurred when the SI-F/G Option Card is designated as the source for run commands or frequency reference (b1-01=3 and/or b1-02=3), and communication with it is lost. This implies a failure in the communication link or configuration with the SI-F/G card. Without proper communication, the Drive cannot receive critical commands or references, leading to a stop.

This fault indicates a consistency error in received control data or a synchronization problem between the master controller and the Drive when using an SI-T option card. It signifies a breakdown in reliable communication, which can lead to unpredictable Drive behavior or complete loss of control. Such errors require immediate attention to restore stable operation.

An external fault condition has been detected by an installed option board. This indicates a problem originating from equipment connected to or monitored by the option board, rather than an internal Drive issue. If ignored, the external issue could damage the connected equipment or compromise system safety.

This fault is triggered when an external condition connected to multi-function digital input terminal S3 activates the Drive's external fault function. The Drive will stop according to its programmed response (ramp, coast, or fast stop). This indicates an issue with the external device or process monitored by S3, potentially leading to unsafe operation if misconfigured.

This fault is triggered when an external condition connected to multi-function digital input terminal S4 activates the Drive's external fault function, causing the Drive to stop. It indicates an issue with the external device or process monitored by S4, which could lead to machine downtime or safety risks if misidentified.

This fault is triggered when an external condition connected to multi-function digital input terminal S5 activates the Drive's external fault function, causing the Drive to stop. It indicates an issue with the external device or process monitored by S5, which could lead to machine downtime or safety risks if misidentified.

This fault is triggered when an external condition connected to multi-function digital input terminal S6 activates the Drive's external fault function, causing the Drive to stop. It indicates an issue with the external device or process monitored by S6, which could lead to machine downtime or safety risks if misidentified.

This fault is triggered when an external condition connected to multi-function digital input terminal S7 activates the Drive's external fault function, causing the Drive to stop. It indicates an issue with the external device or process monitored by S7, which could lead to machine downtime or safety risks if misidentified.

This fault is triggered when an external condition connected to multi-function digital input terminal S8 activates the Drive's external fault function, causing the Drive to stop. It indicates an issue with the external device or process monitored by S8, which could lead to machine downtime or safety risks if misidentified.

This auto-tuning fault indicates an error in the motor data input, a mismatch between motor output and rated current, or an issue with no-load current vs. input motor rated current during vector control auto-tuning. Incorrect motor data prevents the Drive from accurately characterizing the motor, potentially leading to inefficient operation or damage from improper control.

An alarm has been detected during the Auto-Tuning process, signaling a potential issue with the tuning setup or the motor/load configuration. While not a critical fault that stops the Drive, it warns of an incomplete or inaccurate auto-tuning result, which could lead to suboptimal motor performance or control issues.

This Auto-Tuning fault indicates that the process could not complete within the specified time, or the resistance measurement result fell outside the acceptable parameter range. This typically points to issues with motor wiring, motor integrity, or an active mechanical load during tuning. Inaccurate resistance data will compromise motor control and efficiency.

During Auto-Tuning, this fault signifies that the process did not complete within the specified time or the measured no-load current was outside the expected range. This can be caused by incorrect motor data, wiring issues, or a connected load influencing the no-load measurement. An incorrect no-load current value will lead to suboptimal motor parameterization and control.

This Auto-Tuning fault means the process did not complete within the specified time, or the calculated rated slip value was outside the parameter setting range. It can also occur if the motor rated voltage setting (T1-03) is higher than the Drive's actual input voltage. Incorrect slip data will negatively impact motor speed regulation and torque control.

This fault occurs during rotational Auto-Tuning if the motor fails to accelerate within the specified time (C1-01 + 10 seconds). It suggests insufficient torque, an excessive mechanical load, or incorrect acceleration parameters preventing the motor from reaching its target speed during the tuning sequence. Failure to accelerate properly will prevent accurate motor parameter identification.

Detected during rotational Auto-Tuning in vector control (A1-02=2 or 3), this fault indicates that the torque reference exceeded 100% during acceleration. This typically points to an issue with acceleration time, incorrect PG (encoder) pulse data, or an excessive mechanical load on the motor. Exceeding torque limits during tuning will lead to inaccurate motor parameterization and potentially inefficient operation.

This fault occurs during Auto-Tuning when the motor current exceeds its rated value or an open phase is detected on the U/T1, V/T2, or W/T3 output terminals. It suggests an issue with the motor connection, wiring, or an attempt to tune a loaded motor, which can skew current measurements.

Auto-Tuning failed to complete within the expected time frame or the resulting leakage inductance value fell outside the acceptable parameter range. This indicates an inconsistency with the motor's electrical characteristics as measured during tuning, likely due to incorrect input data or motor wiring problems affecting the measurement.

A fault with the Drive's internal cooling fan has been detected, leading to the activation of Drive overload protection due to excessive internal thermal value. This typically occurs when the fan stops running and the Drive continues operating under load, causing heat to build up. Unresolved, this will lead to repeated overheating faults and potential damage to the Drive's power components.

This fault occurs when PID Feedback Loss Detection is enabled (b5-12=2) and the PID feedback signal drops below the defined level (b5-13) for a specified time (b5-14). It signifies that the PID feedback source (e.g., transducer, sensor, building automation signal) is either incorrectly installed, malfunctioning, or disconnected. Loss of PID feedback means the Drive cannot maintain accurate process control, potentially causing system instability.

The Drive has detected an output grounding current exceeding 50% of its rated output current (L8-09 = 1 enabled), indicating a current leakage to ground. This is typically caused by a short in the motor leads, motor windings, or a defective internal current sensor. A persistent ground fault poses a safety risk and can lead to damage to the motor or Drive components.

An open-phase condition has been detected at the Drive's output, where the output current imbalance exceeds 5% (L8-07=1 enabled). This is commonly caused by a broken wire in the motor cable, a broken winding in the motor, or loose output terminal connections. Operating with an open phase can cause motor damage due to imbalanced currents and vibrations, as well as reduced performance.

The Drive's output current has exceeded its overcurrent detection level, typically around 200% of the Drive's rated output current. Common causes include phase-to-phase shorts in the motor or cables, a locked rotor, an excessively heavy load, or insufficient acceleration/deceleration times. Repeated overcurrent can cause damage to the Drive's power components or the motor.

The temperature of the Drive's heatsink has exceeded the programmed setpoint (L8-02, L8-03=0 to 2), indicating inadequate cooling or excessive ambient temperature. This can be caused by a nearby heat source, dirt buildup on fans/heatsink, or high room temperature. Persistent overheating will lead to nuisance trips, reduced performance, and can significantly shorten the Drive's lifespan.

The motor position moved more than 10,000 revolutions during zero servo operation, indicating a loss of position control. This can be caused by an excessively small torque limit, an overly large load torque, or a fault within the control circuit, possibly due to electrical noise interfering with position feedback.

The drive detected that its output current was continuously below the threshold set in L6-02 for longer than the time specified in L6-03, when L6-01 was configured for undertorque detection. This fault indicates that the connected motor is operating under an unexpectedly low load, potentially due to a mechanical issue or process change.

Similar to UL3, this fault indicates the drive's output current was below the L6-05 threshold for longer than L6-06, with L6-04 set for undertorque detection. It signifies a motor running under an unexpectedly light load condition, potentially indicating a process issue or mechanical failure that needs investigation.

The DC bus voltage inside the drive has fallen below the trip point (e.g., 190Vdc for 240V AC input or 380Vdc for 480V AC input), which is adjustable via L2-05. Common causes include insufficient incoming AC power, excessively short acceleration times leading to voltage sag, or significant fluctuations in the input voltage quality.

An undervoltage condition was detected in the drive's internal control circuit while it was operating. This fault typically points to either an excessive load being drawn by external control wiring connected to the drive's power supplies, or an internal electrical fault, such as a short circuit, on the power or gate drive PCB.

The pre-charge contactor, responsible for managing the initial charging of the DC bus capacitors, opened unexpectedly while the drive was running. This often indicates a mechanical issue with the contactor itself, such as dirty or worn contacts, preventing proper mechanical operation or causing premature opening.