Operating principle

Some energy storage units have their own diagnostic interfaces. The diagnostic interfaces are different, but in most cases, they contain the following information:

  • Overvoltage display (digital output)
  • Overtemperature display (digital output)
  • Overtemperature warning (not all)
  • Temperature value (not all)
  • Undertemperature display (not all)

 

Combined energy storage units are referred to as a "storage system" and are defined as follows:

  • A storage system is a collection of energy storage units that form a common DC node.
  • Each energy storage unit can provide its own status information. This status information is displayed in aggregated form for the storage system. Alternatively, system-wide status information can also be determined (using external measuring equipment).
  • Only one storage system with any number of energy storage units can be installed in the DC link (power mode).
  • In energy mode, multiple storage systems can be connected. However, a maximum of one storage system is connected to each MDE90A.

 

Integration

INFORMATION

If an SEW ESS energy storage cabinet is used, the storage diagnostic interfaces are connected to the function block of the energy storage system. The following description applies to all other cases.

The storage diagnostic interfaces are mapped to function blocks of the type StorageManual or to a StorageOCE1n_On_<storage type>. The various function blocks of the type StorageOCE1n_On_<storage type> are variants of the StorageManual function block that can be directly connected with the respective IO modules. These function blocks automatically convert the values. The storage type must correspond to the one in the name and the IO system must be an SEW system with an OCE11C or OCE12C bus coupler. The following code example shows the declaration of 4 energy storage units of a storage system ("PowerMode" may be replaced by the software module used):

VAR

StorageMan :

SEW_MK_PES_PowerMode.StorageManual;

StorageEKS :

SEW_MK_PES_PowerMode.StorageOCE1n_On_SewEKS;

StoragePT :

SEW_MK_PES_PowerMode.StorageOCE1n_On_PTnSensor;

StorageLSMtron :

SEW_MK_PES_PowerMode.StorageOCE1n_On_LSMtron;

Storage_Phoenix_AXLFBKEC_On_LSMtron :

SEW_MK_PES_PowerMode.Storage_Phoenix_AXLFBKEC_On_LSMtron

END_VAR

Alternatively, SEW‑EURODRIVE’s own storage unit (MOVI-DPS® or EKS) can be connected directly via the MDP92A/MDE90A supply units. In this case, the energy storage unit is also configured via the devices. It is also possible to combine the two variants.