Servotronix CDHD2S User Manual page 245

Troubleshooting
Drive is not ready:
No SW enabled
Fault exists
FLT4STO fault
Since the drive is enabled and fails, the failure recovery procedure must be performed.
CANopen and EtherCAT
If the drive is enabled and STO power is removed, a fault condition will occur.
Object 603Fh subindex 0 provides the current error error code.
The STO fault code is 12673 (decimal).
STO event recovery
If the drive is disabled while the STO function is in effect, no recovery procedure is required.
Once power is restored to STO, the drive will operate normally.
If the drive is enabled while the STO function is active, the drive will enter a fault state. Since
the drive fault status is blocked, the drive cannot be enabled until the fault status is clearly cleared,
so a fault recovery procedure is required.
After STO power is restored, the fault clearing command must be executed. After successful
fault clearing, the drive works again. Fault clearing can be performed in any of the following ways:
Switching drive enable: This can be done by executing the drive disable (K) command
⚫
followed by the enable (EN) command, or by switching the remote enable line
(REMOTE).
In some systems, specific drive inputs are defined as alarm clearing. In such systems,
⚫
the fault is cleared by switching the input.
Execute the clear fault command (CLEARFAULTS).
⚫
If the STO fault condition no longer exists, the drive will be re-enabled.
STO is forbidden to use
When the STO function is in effect, the STO function shall not be used under the condition that
external influence will cause danger (such as hanging load falling).
The STO function is explicitly prohibited in elevator applications. In these cases, additional
measures (e.g. mechanical braking) are required to prevent any danger.
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