Overload protection

Each supply voltage output X60 ... X63 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
• Starting current limitation, not configurable

If an output current exceeds the nominal current (factory setting 4 A), the status bit "Warning" is set. In this range, the protection mechanisms are active as follows:

• Below 4.4 A, only the overload switch-off is active. It switches off the respective output voltage according to the configured tripping characteristic.
  See chapter Configure overload switch-off.
• At 4.4 A, the starting current limitation limits the current.
  Now the overload switch-off and starting current limitation are active at the same time. The output voltage is either switched off by the overload switch-off according to the switch-off characteristic or by the starting current limitation in the event of thermal overload.

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 output is set.
• The output voltage status LED of the output 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 at the output variable "DPO Inputs Channel n" > "Reset Ux" of the respective supply voltage output.
• a positive edge at the output variable "DPO Outputs Device" > "Global Reset"

The status bit "Error" is also reset as a result.