STO input mismatch (_ecSTO_INPUT_MISMATCH)

Hva betyr 10035 ?

The drive has detected an inconsistency in its internal Safe Torque Off (STO) registers, meaning the two redundant STO inputs are not in the same state. This is a safety fault that can occur whether the drive is enabled or disabled, indicating a potential failure in the safety circuit or a timing issue, which compromises the STO function.

• One of the two redundant STO input signals (e.g., STO_IN1, STO_IN2) transitions state (e.g., from 24VDC to 0VDC) significantly before or after the other.
• Asynchronous operation of external safety relays or contacts supplying the two STO inputs, leading to a momentary state difference.
• A wiring fault or intermittent connection on only one of the STO input terminals (e.g., a loose wire at X12.1 but not X12.2).
• Interference (e.g., EMI) affecting only one of the STO input signal lines, causing a momentary false transition.
• Internal timing discrepancy or component tolerance drift within the STO monitoring circuit of the drive.

Klikk på steg for å spore fremgangen.

1. 1

   Using a dual-channel oscilloscope, monitor both STO input signals (e.g., STO_IN1 at X12.1 and STO_IN2 at X12.2) simultaneously to identify any timing discrepancies during state changes.

2. 2

   Inspect the wiring to both STO input terminals (e.g., X12.1 and X12.2) for any loose connections, damaged insulation, or incorrect termination.

3. 3

   Test the external safety relays or contactors (e.g., K1, K2) providing the STO signals for consistent and simultaneous opening/closing of their contacts.

4. 4

   Ensure adequate shielding for the STO input cables, and route them away from power cables or sources of high electromagnetic interference (EMI).

5. 5

   Confirm that the drive's STO configuration parameters (if any, e.g., P10-01 (STO Delay Time)) are set appropriately for the application and safety component response times.