E-30 / StOÂ Safe Torque Off (STO) fault in Toshiba drive
E-30 / StO Safe Torque Off (STO) Fault fault in Toshiba drive
Description Modern drives (like the VF-S15 and AS3) come with "Safe Torque Off" safety inputs (usually labeled STO, +SU, or S1/S2 safety channels). This is a hardware-based safety function that physically cuts power to the gate drivers, ensuring the motor cannot generate torque. E-30 indicates a discrepancy in this safety circuit—specifically that the dual channels (Channel A and Channel B) do not match. Causes
1. Uneven Switching: The external safety relay or E-Stop button opened Channel A but left Channel B closed. The drive sees this as a system failure.
2. Jumper Missing: On a new drive, the factory jumper bar (connecting STO terminals to 24V) is missing or loose.
3. Wiring Delay: One safety wire is longer or has higher resistance, causing a timing lag between the two signals arriving at the drive.
4. Hardware Failure: The internal safety monitoring relay on the VFD board has failed. Solution Check the terminal strip (often orange colored on newer models). If you are NOT using the safety function, ensure the factory-supplied metal jumper is securely connecting the STO terminals to the P24/Power terminals. If this jumper is loose, vibration will trip E-30.
If you ARE using a safety relay, check the timing. The drive expects both safety channels to switch within a few milliseconds of each other. If your external safety relay has a "sticky" contact, one channel might drop out later than the other, triggering the fault.
Resetting E-30 often requires a full power cycle (turning the drive completely off and on), as safety faults are designed to latch for security.
Description Modern drives (like the VF-S15 and AS3) come with "Safe Torque Off" safety inputs (usually labeled STO, +SU, or S1/S2 safety channels). This is a hardware-based safety function that physically cuts power to the gate drivers, ensuring the motor cannot generate torque. E-30 indicates a discrepancy in this safety circuit—specifically that the dual channels (Channel A and Channel B) do not match. Causes
1. Uneven Switching: The external safety relay or E-Stop button opened Channel A but left Channel B closed. The drive sees this as a system failure.
2. Jumper Missing: On a new drive, the factory jumper bar (connecting STO terminals to 24V) is missing or loose.
3. Wiring Delay: One safety wire is longer or has higher resistance, causing a timing lag between the two signals arriving at the drive.
4. Hardware Failure: The internal safety monitoring relay on the VFD board has failed. Solution Check the terminal strip (often orange colored on newer models). If you are NOT using the safety function, ensure the factory-supplied metal jumper is securely connecting the STO terminals to the P24/Power terminals. If this jumper is loose, vibration will trip E-30.
If you ARE using a safety relay, check the timing. The drive expects both safety channels to switch within a few milliseconds of each other. If your external safety relay has a "sticky" contact, one channel might drop out later than the other, triggering the fault.
Resetting E-30 often requires a full power cycle (turning the drive completely off and on), as safety faults are designed to latch for security.
Comments
Post a Comment