Energy storage unit

Parameter group

Description

Energy storage unit

Setting of the energy storage unit and other capacitances permanently installed in the application as the basis for calculations. Internal device capacitances need not be taken into account.

  • DC connection energy storage unit separable – the energy storage unit can be disconnected from the DC link or the connected device on all poles via a corresponding contactor or load-break switch circuit.
  • Default value: No
  • Storage connection type – selection of how the connectable energy storage unit is connected.
  • Default value: Active DC synchronization
  • Electrostatic nominal capacitance – capacitance of the connectable energy storage unit. Only visible if "DC connection energy storage unit separable" has the value "Yes".
  • Default value: 0 F
  • Output stage side – side of the output stage to which the nominal electrostatic capacitance is connected. Only visible if "DC connection energy storage unit separable" has the value "Yes".
  • Default value: A-side
  • Determination of resistance – type of resistance determination of the internal resistance of the storage unit.
  • Default value: Internal calculation
  • Internal resistance – internal resistance of the separable energy storage unit. (Only visible if the "Determination of resistance" parameter is set to "User-defined values".)
  • Default value: 0 mOhm
  • Capacity application fixed (A-side) – capacitance of permanently installed energy storage units on the A‑side of the output stage.
  • Default value: 0 mF
  • Capacity application fixed (B-side) – capacitance of permanently installed energy storage units on the B‑side of the output stage. This option is only available when using MDE90A.
  • Default value: 0 mF

Fuse protection

 

INFORMATION: The parameterized voltage limits are applied to the storage side. If the energy storage unit is connected to the A‑side, the limits apply to the DC link. If the storage unit is connected to the B‑side, the limits apply to the B‑side.

The additional function "Fuse protection" is set using the following parameters:

  • Fuse protection – activate
  • Default value: No
  • Fuse protection – type of fuse protection
  • Default value: Multi-stage fuse concept
  • Fuse protection
    Switching threshold current limitation OFF
  • Default value: 0 V
  • Fuse protection
    Switching threshold current limitation ON
  • Default value: 0 V
  • Multi-stage fuse concept
    Fuse nominal value
  • Information: A permanent load capacity of the fuse of 80% of the nominal value is assumed and applied accordingly as a limit.
  • Default value: 0 A

Modular RCD

The modular residual current device is set using the following parameters:

  • MRCD installed
  • Activates the control and monitoring functions of an installed MRCD.
  • MRCD test interval
  • An MRCD test cycle must be performed within this time. Otherwise, a warning message appears stating that a test must be performed.

Energy storage monitoring

Energy storage monitoring is set using the following parameters:

  • Temperature offset of external energy storage modules
  • Temperature offset for correcting the cooling function of external energy modules. These tend to be a few degrees cooler during operation than storage modules in the middle of the stack since they have large outer surfaces and can therefore dissipate more heat to the environment. This slightly cooler measuring temperature is corrected by the temperature offset so that the temperatures match on average the module temperatures of the modules arranged in the middle of the stack. This prevents an incorrect activation of the check for implausible measured values.
  • Default value: 5 °C
  • Maximum temperature difference of the energy storage modules
  • Maximum difference by which the temperatures of the energy modules may deviate from one another. A larger temperature difference in individual modules compared to the median of the entire measurements indicates, for example, a defective measuring sensor.
  • Default value: 10 °C