Reject Management

The reject management function automatically repairs or ends failed steps in the tightening process.

At each synchronization point, the system checks the status of the tightening.

  • If the status is OK, the system starts the next step in the tightening program.

  • If the status is NOK, the system performs one of the following actions:

    • Repair the step

    • End the step

    • Stop the tightening program

The reject management function is used for automatic repair or termination of failed steps. At each synchronization point the status of the tightening is evaluated. If the status is OK the next part of the tightening program starts. If the status is NOK, an action is taken to repair, terminate or end the tightening program.

The repair path from each synchronization point is defined in the repair area of the tightening program. The termination path from each synchronization point is defined in the termination area of the tightening program.

Status at a synchronization point

When all tools have reached a synchronization point the status of each tool and the total status is evaluated.

Status Type

OK

NOK

Not repairable

Fatal

Tool

Everything is OK so far.

The step(s) before the synchronization point has an error detected by a monitor. For these errors a repair is possible to do.

The step(s) before the synchronization point has an error detected by a restriction.

The step(s) before the synchronization point has a fatal error. Reasons for this can be:

  • Hardware errors in tool or drive

  • Max time in program restriction Time was reached

  • Max torque in program restriction Torque was reached

Repair group

All the tools in the repair group reached the synchronization point with status OK.

At least one of the tools in the repair group reached the synchronization point with status NOK (and none had the status Not repairable or Fatal).

At least one of the tools in the repair group reached the synchronization point with status Not repairable (and none had the status Fatal).

At least one of the tools in the repair group reached the synchronization point with status Fatal.

Total status

All the tools reached the synchronization point with status OK. The execution of the program continues with the next step in the tightening.

At least one of the tools reached the synchronization point with status NOK (and none had the status Not repairable or Fatal).

At least one of the tools reached the synchronization point with status Not repairable (and none had the status Fatal).

At least one of the tools reached the synchronization point with status Fatal.

Calculate action if total status at a synchronization point is NOK

If total status at a synchronization point is NOK, the applicable action is calculated. The action is decided based on the triggers set. The first trigger that is fulfilled decides the action to be taken:

  1. Maximum number of failing steps exceeded

    If the total number of failing steps in the whole tightening exceeds the Max number of failing steps the Action of exceeded is used. If the same step fail more than once it still only counts as one failing step.

  2. Maximum number of repairs exceeded

    If the total number of repairs started from the current synchronization point exceeds the Repairs in the Number of repairs trigger the Repair action is used.

  3. Maximum number of failing groups

    If the number of failing groups (groups that have status NOK) exceed the NOK groups in the Number of NOK channels trigger the NOK group action is used.

  4. Maximum number of failing tools

    If the number of failing tools (tools that have status NOK ) exceed the NOK channels in the Number of NOK groups trigger the NOK channel action is used.

  5. Default failing action

    If none of the conditions above are fulfilled, the setting in Default failing action is used.

In this Section