Overload protection

Each EtherCAT P port has overload protection for the output voltages U_S and U_P. If an output voltage is switched off due to overload, all other output voltages remain switched on.

The overload protection comprises two protection mechanisms:

• Overload switch-off, configurable
• Current limitation, not configurable

Above the set nominal current, the status bit "Warning" is set. In this range, the protection mechanisms are active as follows:

• Only the overload switch-off is active between the nominal current and the current limit. It switches off the respective output voltage according to the configured tripping characteristic.
  See chapter Configure overload switch-off.
• The current limitation prevents the output current from exceeding a certain value.
  It switches off the output voltage thermally if the output current has to be limited for too long. The switch-off time depends on the ambient conditions.

You can use the data logger to determine which of the two protection mechanisms has switched off an output voltage. See chapter Troubleshooting with the data logger.

Overload message

If the overload protection has switched off an output voltage, this is reported as follows:

• The status bit "Error Us" or "Error Up" of the port is set.
• The output voltage status LED of the port lights up red.

If an output voltage has been switched off by the overload protection, it can be enabled again by one of the following actions:

• a positive edge on the output variable "DPO Inputs Channel n" > "Reset Ux" of the respective EtherCAT P port
• a positive edge on the output variable "DPO Outputs Device" > "Global Reset"

This also resets the status bit "Error".