STL1 (Channel H1 Abnormal):
A fault or internal hardware circuit error may have occurred in channel H1. The solution is to replace the STO switch. If the issue persists, contact the manufacturer.

STL2 (Channel H2 Abnormal):
A fault or internal hardware circuit error may have occurred in channel H2. The solution is to replace the STO switch. If the issue persists, contact the manufacturer.

STL3 (Internal Circuit Abnormal):
A fault or internal hardware circuit error may have occurred in both H1 and H2 channels simultaneously. In this case, you should contact the manufacturer.

CrCE (Safety Code FLASH CRC Control Error):
An error may have occurred during the STO safety code FLASH CRC control. In this case, contact the manufacturer.

LL (Electronic Low Load Fault):
The inverter will trigger a low load pre-alarm based on the set value. As a solution, check the load and the low load pre-alarm point.

STO (Safe Torque Off):
The STO function is operating normally.

STO Alarm Description:

    When the Hundreds Digit of Parameter P11.16 is Set to 0:
    The STO alarm is locked. As shown below, when H1 and H2 signals are "OFF" (when the safety function is required), the drive enters safety mode and stops the output. The STO alarm will disappear only when a reset operation is valid. An external operation command must be reset so that the drive can execute the restart command.

    When the Hundreds Digit of Parameter P11.16 is Set to 1:
    The STO alarm is unlocked. As shown below, when the alarm is not locked, the STO alarm will automatically disappear when the condition returns to normal and does not require a reset operation. Once the external operation command is reset, the drive will execute the restart command.

STL1 Fault:
As shown below, when hardware circuit 1 in the safety circuit is abnormal, but the H2 signal is normal (i.e., H1 signal is abnormal during operation when the safety function is required), the drive will enter safety mode and stop the output. Despite the reset commands, the drive will not execute the operation command again, and the STL1 alarm will remain locked.

STL2 Fault:
As shown below, when hardware circuit 2 in the safety circuit is abnormal, but the H1 signal is normal (i.e., H2 signal is abnormal during operation when the safety function is required), the drive will enter safety mode and stop the output. Despite the reset commands, the drive will not execute the operation command again, and the STL2 alarm will remain locked.

Other Conditions:

    PoFF (System Power Off):
    The system power may be off, or the DC voltage may be low. In this case, check the power supply.