Module bus – fault transmission

The module bus master sends all fault codes, subfault codes, fault messages and the type of the fault that occur to all connected module bus slaves using the module bus. The fault processing in the slave only evaluates the type of the fault. Fault code and subfault code serve only as information. Depending on the type of the fault, the slave triggers the respective fault response.

If the power supply module is configured as module bus master, the faults of the master are transferred to the module bus slaves under the fault group E47.x. The fault group "47 Supply unit" includes 3 stages as to how the faults are classified. The exact fault is signaled as a fault of the subcomponent (index 8365.3 in module bus slave).

These 3 stages include:

  • E47.1 Supply unit – warning
  • E47.2 Supply unit – standard fault
  • E47.3 Supply unit – critical fault

Using parameter "8627.4 Fault transmission mode", you can configure the severity of faults. The following configuration can be selected:

  • Conventional: Slave reacts to the faults of the module bus master with the configured fault response.
  • The faults are classified according to their fault response:
    • E47.1 Supply unit – warning:
    • – Warning
    • – Warning with self-reset
    • E47.2 Supply unit – standard fault:
    • – Emergency stop + output stage inhibit
    • – Emergency stop (+output stage inhibit) with self-reset
    • E47.3 Supply unit – critical fault:
    • – Output stage inhibit with self-reset
    • – Output stage inhibit
    • – Inhibit brake chopper
    • – Disconnect storage unit
  • Warning: The faults of the module bus master are always transferred and treated as a warning independent of their fault level. This setting is required, for example, if the slaves should continue to work in case of a power failure that was detected by the master.

Example power failure:

There are two configuration options if the module bus slaves are to ignore the power failure that was detected in the master:

  1. Parameter 8627.4
  2. Set fault transmission mode to "Warning": All faults of the master are processed as warning.
  3. Only the configurable line faults (line phase failure, power failure and line undervoltage) are set to "Warning" or "No response". Other faults can be treated as standard or critical faults.