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Getting the INVT inverter OL2 fault? This motor overload alarm means your motor is drawing too much current. Learn how to check your load, motor parameters, and inverter settings.   If your INVT inverter suddenly stops and displays OL2 on the keypad, it is signaling a Motor Overload fault. This means the motor connected to the inverter has been drawing current in excess of its rated value for a duration that exceeds the drive's thermal capacity. The INVT drive uses an internal inverse-time thermal model to protect the motor. The OL2 fault is your drive’s way of saying: "The motor is running too hot, and if I don't stop now, the motor windings will be damaged." Common Causes of OL2 Mechanical Overload: The machine is physically jammed, the load is too heavy, or the bearings are seizing. Incorrect Motor Data: The motor’s rated current (found on the nameplate) is not correctly entered into the inverter’s parameters. Low-Speed Operation: The m...

Getting the oFC00 error on your Yaskawa drive? This indicates an option card incompatibility in port CN5-C. Learn how to verify compatibility, check card seating, and resolve the error.   If your Yaskawa drive suddenly displays the oFC00 error, the drive has detected a hardware mismatch. Specifically, this error indicates an Option Card Connection Error occurring in the CN5-C port . In simple terms, the drive recognizes that an option card is plugged into the slot, but it either doesn't recognize the card type or knows that the card is incompatible with the drive's firmware/hardware version. This is a protective fault designed to prevent electrical damage or control errors caused by attempting to run the drive with an unsupported or incorrectly installed accessory. What Triggers the oFC00 Error? Incompatibility: The option card installed in the CN5-C slot is not supported by your specific drive model or firmware version. Physical Misalignment: The ...

Siemens SINAMICS drive showing Fault F30027? Learn why your DC link failed to pre-charge on time, how to check your line contactor, and how to verify input voltage stability. In a Siemens SINAMICS drive, the "pre-charging" stage is a critical safety routine. When you first apply power, the drive must charge its internal DC link capacitors slowly through internal resistors to prevent a massive, damaging inrush of current. If the drive takes too long to reach the required voltage, it triggers Fault F30027: Precharging DC link time monitoring. Think of this as the drive saying: "I’m trying to wake up, but the power isn't getting into my capacitors fast enough." Here is how to find out why the charging circuit is failing. What Triggers Fault F30027? This fault occurs when the drive does not detect the DC link reaching a healthy voltage level within the expected timeframe. Common causes include: Missing Line Supply: The main AC input...

Getting the Mitsubishi VFD E.OC1 error? This overcurrent alarm happens during acceleration. Learn how to check motor load, ramp times, and output cables to get your drive running smoothly.   The Mitsubishi Inverter is designed to protect itself from excessive current. If your keypad displays E.OC1 , the drive has detected an Overcurrent condition during the acceleration phase . In simple terms, the drive is trying to speed up the motor, but the motor is demanding more current than the drive's output transistors (IGBTs) can safely supply. If the drive did not stop, these internal components would likely burn out. Here is a systematic approach to identifying and fixing the cause of this trip. Common Causes of E.OC1 Ramp-Up Time Too Short: The drive is trying to force a heavy load (high inertia) to reach full speed too quickly. Mechanical Stalling: The driven load (conveyor, pump, or fan) is physically jammed or experiencing high starting torque. Short Circu...

Getting the PGO error on your Yaskawa G7 VFD? Learn how to troubleshoot PG disconnection, check encoder wiring, and verify power supply to your feedback device.   The Yaskawa G7 is a highly reliable drive often used in demanding applications requiring closed-loop speed control. When the drive displays the PGO (PG Disconnection Detected) error, it means the drive is trying to control the motor speed but has lost the "pulse" signal from the Pulse Generator (Encoder) that tells it exactly how fast the motor is turning. Without this feedback loop, the G7 cannot accurately regulate speed and will stop the drive immediately to prevent an uncontrolled motor runaway. Here is your step-by-step guide to finding the break in the loop. What Triggers the PGO Error? The PGO error occurs when the drive detects that it is outputting a frequency to the motor, but it sees zero corresponding pulses coming back from the encoder. The most common causes are physical...

Siemens S120 drive showing Fault F31885? This cyclic data transfer error means your encoder and Control Unit are out of sync. Learn how to check cables, shielding, and DRIVE-CLiQ connections.   In high-precision motion control applications using the Siemens SINAMICS S120 , the DRIVE-CLiQ interface is the digital "nervous system" that connects your motor encoders to the Control Unit (CU). If you are seeing Fault F31885 , this system has been compromised. Fault F31885 indicates a Cyclic data transfer error . Essentially, the Control Unit and the Sensor Module (encoder) are no longer "shaking hands" in perfect synchronization. The drive has detected that the data telegrams are missing, arriving out of order, or failing to acknowledge the "sign-of-life" bit that ensures a safe, continuous connection. Common Causes of F31885 This fault is almost always related to the physical integrity of the DRIVE-CLiQ communication path. Common culpr...