Yaskawa VS-616G5 Variable Speed Drive

This fault occurs when using the SI-B or CP-916 communication options if communication is lost after being established. It signifies a disruption in communication with the option card, which can halt control functions or data exchange, leading to operational stoppage and loss of control.

This fault occurs when communication via MODBUS (MEMOBUS) is interrupted for longer than 2 seconds after initial communication has been established. This indicates a loss of data exchange with the control system or HMI, which can lead to uncontrolled operation, system downtime, or failure to receive critical commands.

This fault indicates an internal malfunction within the inverter's CPU, specifically related to its Analog-to-Digital (A/D) converter. It suggests a problem with the inverter's ability to accurately read analog signals, which is critical for its control functions. Input phase loss detection is disabled under this condition.

This fault occurs when the actual motor speed significantly deviates from the commanded speed, particularly in applications using closed-loop control with a PG (Pulse Generator/encoder). It suggests a problem with the speed feedback device, the motor's ability to follow the command, or a tuning issue in the speed control loop. Unresolved deviation can lead to poor process control or mechanical stress.

This fault may occur when using the SI-F or SI-G communication options if communication is lost after being established. It signifies a disruption in data exchange with the specific option card (SI-F or SI-G), which can halt control functions or data exchange, leading to operational stoppage and loss of control.

This fault indicates an issue with the run command or a conflict in the command source (e.g., local/remote, digital input, serial). It prevents the inverter from starting or continuing operation. This can happen if the run command is unexpectedly lost, or if there's a discrepancy in how the inverter is commanded to run.

This fault indicates an external condition has triggered a protective response from the inverter. The specific action taken by the inverter (e.g., ramp to stop, coast to stop, alarm) is determined by parameter F9-03. This is typically activated by an external safety circuit or process interlock.

This fault indicates that an external protective device or interlock connected to a specific digital input (corresponding to EF3) has been activated, triggering a trip in the inverter. The specific cause depends on the external device wired to that input. This is a safety feature to stop the drive based on external process conditions, preventing damage to the system or injury.

This fault indicates that an external protective device or interlock connected to a specific digital input (corresponding to EF4) has been activated, triggering a trip in the inverter. The specific cause depends on the external device wired to that input. This is a safety feature to stop the drive based on external process conditions, preventing damage to the system or injury.

This fault indicates that an external protective device or interlock connected to a specific digital input (corresponding to EF5) has been activated, triggering a trip in the inverter. The specific cause depends on the external device wired to that input. This is a safety feature to stop the drive based on external process conditions, preventing damage to the system or injury.

This fault indicates that an external protective device or interlock connected to a specific digital input (corresponding to EF6) has been activated, triggering a trip in the inverter. The specific cause depends on the external device wired to that input. This is a safety feature to stop the drive based on external process conditions, preventing damage to the system or injury.

This fault indicates that an external protective device or interlock connected to a specific digital input (corresponding to EF7) has been activated, triggering a trip in the inverter. The specific cause depends on the external device wired to that input. This is a safety feature to stop the drive based on external process conditions, preventing damage to the system or injury.

This fault indicates that an external protective device or interlock connected to a specific digital input (corresponding to EF8) has been activated, triggering a trip in the inverter. The specific cause depends on the external device wired to that input. This is a safety feature to stop the drive based on external process conditions, preventing damage to the system or injury.

This fault occurs when an external fault condition is detected via the CP-916 option card, specifically when the inverter is configured for serial communication using this card. The trip condition (open or closed) is defined by parameter F9-01. This signifies that an external safety or process interlock, monitored by the CP-916, has been triggered, requiring immediate attention.

This fault indicates that an internal fuse in the inverter has blown, likely due to an overcurrent condition, a short circuit, or an internal component failure. A blown fuse often signifies a significant protective event and requires careful investigation before replacement. Operating with blown fuses can lead to further damage to the inverter's internal circuitry.

The ground fault detection circuit monitors output current and activates when one of the inverter output phases is connected to ground, or the grounding current exceeds 50% of the inverter rated current. This condition poses a serious electrical hazard, risks personnel safety, and can damage the inverter and connected motor if not resolved promptly.

This fault occurs when one of the inverter's output phases to the motor is lost, typically detected if the RMS current value for a phase drops below a detection level for 10 seconds. This indicates a potential disconnection, break in motor wiring, or a fuse blown on one phase. Operating with phase loss can lead to motor overheating, vibration, and uneven wear, severely damaging the motor.

This fault indicates that the inverter's output current has exceeded its safe operating limit, often due to a sudden increase in motor load, a short circuit in the motor wiring, or rapid acceleration. Excessive current can damage the inverter's power components (IGBTs) and the motor windings if sustained. It triggers a protective shutdown to prevent hardware failure.

The OH condition indicates that the inverter's heatsink temperature has risen above the set OH Pre-Alarm Level (L8-02). This is a warning that the inverter is approaching an over-temperature condition. If the temperature continues to rise, the inverter will likely trip to protect its internal power components.

The electronic thermal overload function estimates motor temperature based on inverter output current and time. When this function is activated, an OL1 error occurs, shutting OFF the inverter output to prevent excessive motor overheating. Persistent overload significantly reduces motor lifespan and can cause winding insulation failure.

This fault indicates the inverter itself is experiencing an overload condition, likely due to excessive output current over time. It triggers a shutdown to protect the inverter's power components (IGBTs, rectifiers) from damage. Persistent inverter overload can lead to component failure, overheating, and reduced lifespan of the drive.

The OL3 alarm indicates that the motor's current or torque has exceeded the programmed Overtorque Detection 1 Level (L6-02) for a duration longer than the Overtorque Detection 1 Time (L6-03). This suggests an excessive mechanical load or an obstruction in the driven equipment.

The OL4 alarm or fault signifies that the motor's current or torque has surpassed the Overtorque Detection 2 Level (L6-05) under conditions defined by L6-04. Depending on the L6-04 setting, the inverter might continue running (alarm) or coast to a stop (fault). This secondary detection allows for different responses to specific overtorque scenarios.

This fault indicates that one or more parameters in the inverter have been set to an invalid value or are inconsistent with other critical settings, preventing proper operation. This can occur due to incorrect manual input, a corrupted parameter download, or an incompatible configuration for the selected control mode. It prevents the inverter from starting or operating safely.

This fault is triggered when the motor's actual speed exceeds a pre-set overspeed detection level (F1-08) for a specified time (F1-09). This can occur due to an incorrectly set speed reference, loss of load, a faulty speed feedback device, or the motor being driven externally by the load. Sustained overspeed can cause mechanical damage to the motor and coupled equipment.

This fault occurs when the DC bus voltage inside the inverter exceeds a permissible threshold. It is commonly caused by regenerative energy from the motor during rapid deceleration, an unstable input power supply, or a malfunctioning braking resistor. Sustained overvoltage can damage the inverter's DC link capacitors and power components.

The PF fault occurs when the inverter detects the loss of one or more incoming AC power phases. This is determined by monitoring the DC bus voltage ripple; if the voltage difference (∆V) exceeds a threshold for 0.5 seconds, the fault is declared, and the motor coasts to a stop to prevent damage.

This fault indicates a loss or disconnection of the Pulse Generator (PG) signal, which is used for speed feedback in closed-loop control modes. It signifies that the inverter is no longer receiving reliable motor speed information from the encoder. This will prevent accurate speed control and can lead to unpredictable motor behavior if not addressed.

The RH fault signifies that the dynamic braking (DB) resistor has overheated, detected when its duty cycle exceeds 3% as monitored by the inverter's software. This protection mechanism prevents damage to the resistor from excessive braking energy, causing the inverter to coast to a stop.

This fault occurs when a short circuit is detected in the motor windings or the cabling between the inverter and the motor. It represents an immediate and severe electrical overload. The inverter quickly shuts down its output to prevent catastrophic damage to its power semiconductors (IGBTs) and potentially the motor.

This fault (PUV) indicates that the input DC bus voltage has dropped below a safe operating level. This can be caused by a momentary power loss, a significant voltage sag in the incoming AC supply, or issues with the input power supply circuit. An undervoltage condition prevents the inverter from adequately controlling the motor and can lead to unstable operation or damage to internal components.

This fault indicates that the internal control power supply voltage within the inverter has dropped below its acceptable level. This often points to an issue with the inverter's internal power supply board or auxiliary power components. When the control circuit loses stable power, the inverter cannot operate reliably or safely, leading to a complete shutdown.

This fault typically indicates an issue with the feedback signal from a Motor Contactor (MC) or output contactor. If the inverter expects a contactor to close or open and does not receive the corresponding feedback signal within a set timeframe, this fault is triggered. This protects against situations where the motor may not be properly connected or disconnected, which could lead to unsafe operation.

This fault indicates an issue with the regenerative braking transistor or its control circuit within the inverter. The regenerative transistor is responsible for dissipating excess energy from the motor during deceleration into a braking resistor. A fault here means the inverter cannot safely handle regenerative power, which can lead to overvoltage trips or damage to the DC bus capacitors.