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A Yaskawa drive A32 fault (or A.32) indicates a Braking Transistor Fault , often triggered by excessive regenerative load, a short-circuit in the braking circuit, or failure of the internal braking transistor . Key Troubleshooting Steps: Check Braking Resistor: Ensure the resistor is not damaged, properly connected, and sized correctly for the load. Review Application: Decrease the braking frequency and increase the deceleration time ( ). Check Drive Wiring: Inspect the terminals for short circuits. Check for Internal Failure: Cycle power; if the fault returns immediately, the internal braking transistor may be damaged, requiring repair or replacement.  

The ABB VFD warning A7C1 indicates  Cyclical communication between drive and fieldbus adapter module A or between PLC and fieldbus adapter module A is lost. Cause & Solution Check status of fieldbus communication. See user documentation of fieldbus interface. Check settings of parameter groups 50 Fieldbus adapter (FBA), 51 FBA A settings, 52 FBA A data in and 53 FBA A data out. Check cable connections. Check if communication master is able to communicate.

If your Danfoss VLT 5000 is not running in reverse, check parameter 400 (Direction) to ensure it is not locked to "Forward only" (set to 0), and verify that terminal 19 (or the configured reversing terminal) is receiving a 24V signal . Additionally, check for alarm 60 (external signal missing) or parameter 200/201 which may limit speed to forward Key Troubleshooting Steps: Parameter Settings : Parameter 400 (Direction): Set to 0 (Forward), 1 (Reverse), or 2 (Both). Change to 2 to allow both directions. Parameter 200/201: Ensure there is no speed limit preventing reverse rotation. Wiring/Control Signals : Verify that +24V is connected to terminal 12 (or 13) and bridged to terminal 19 (reverse) via a switch. Check for alarm 60, which indicates a missing or invalid control signal, often causing "auto remote coast". Keypad Check : If running in "Hand" mode, you may need to use the + or - keys to reverse the direction, or change the direction via parame...

To reset a Panasonic servo absolute encoder (clearing alarm AL.450 or 451), replace the battery first with control power ON. Then, use the front panel to navigate to Pr0.0E (Absolute Encoder Setup) , set it to 6 (clear encoder), and restart the drive . If the encoder data is corrupted, clear the alarm via the parameter settings or software Step-by-Step Reset Procedure: Replace Battery: Ensure the servo driver control power is ON to prevent losing data. Replace the battery if voltage is low. Access Parameter Menu: On the servo drive front panel, press the S key , then use the M key to find the parameter setting mode. Navigate to Absolute Encoder Setup: Find Pr 0.0E (or Pr00E). Clear Encoder: Change the value of Pr0.0E to 6 (or 0006 ) to initiate the absolute encoder clear/reset. Save and Restart: Hold down the S key to save, then cycle the main power to the driver (turn off and on). Verify: The alarm should be gone. You may need to perform a machine zero return (homing) opera...

The F30021 fault on a Siemens Sinamics drive (G120, S120, G130) indicates a Power Unit Ground Fault . It means the drive has detected a short circuit to ground on the output side, often caused by damaged motor cables, insulation failure in the motor windings, or a defective motor module/current transformer (CT). Common Causes for F30021 Motor Cable Fault: Short circuit in the motor cable to ground or damaged shielding. Motor Winding Failure: Insulation failure within the motor. Defective Power Unit/IGBT: The inverter module (IGBTs) is damaged. Defective CT/Module: Current Transformers (CT) inside the drive have failed. Environmental Factors: Excessive moisture, dust, or condensation in the terminal box   Troubleshooting Steps Check Motor and Cables: Disconnect the motor cables from the drive and run the drive. If the fault disappears, the issue is in the motor or cable. Use a megger to test motor phase-to-ground insulation. Inspect Connections: Verify that the motor ca...

Is your L&T drive flashing "bb"? Learn what the Base Block signal means, why it inhibits your motor, and how to troubleshoot the wiring and parameters. If you’re working with an L&T Sx2000 or Cx2000 drive and the display is flashing "bb," you might think you’re looking at a fault code. However, in the L&T/Yaskawa ecosystem, "bb" isn't technically a "hard fault"—it is a status indicator for Base Block . In simple terms, "bb" means the drive has cut off the output to the motor. The internal transistors (IGBTs) are turned off, and the motor is allowed to coast to a stop. The drive is essentially in a "safety pause" and is waiting for a signal before it will allow the motor to restart. Let’s find out why your drive is stuck in this mode. Common Causes of the "bb" Signal When an L&T drive shows "bb," it is usually responding to an external command or ...