Discharging the energy storage unit
For safety reasons, energy storage units must be discharged prior to performing any service work. For this reason, SEW-EURODRIVE recommends providing a suitable discharge unit for applications with energy storage units. Select the corresponding discharge unit for your application from the table.
Energy storage unit | Discharge unit | Part number |
|---|---|---|
MDC90A.. capacitor modules and MDC92A.. energy modules | MOVI-DPS® discharge unit, size 1 | 13574949 |
Double-layer capacitors | EKD-003 discharge unit | 28265610 |
A discharge connection socket is required to connect a discharge unit. The energy storage systems which SEW-EURODRIVE offers ready-mounted in a control cabinet as a complete system come equipped with a connection for a discharge unit in their delivery state.
If double-layer capacitors are used when constructing an energy storage system from individual components, always ensure a connection for a discharge unit is provided. In this case, you will need the components listed in the table. When using an MDC90A.. capacitor module and an MDC92A.. energy module, optionally provide a discharge connection.
Required accessories | Part number |
|---|---|
Short circuit and ground fault-proof cable (NSGAFÖU) from the storage unit to the fusing element | – |
Housing including cap with gasket | 09200030306 (Harting) |
Socket insert | 09120023152 (Harting) |
3 crimp contacts | 09320006208 (Harting) |
3 conductors with a cross section of 2.5 mm² in customer-specific length for positive wire, negative wire, and PE, from the fuse to the discharge socket | – |
Short-circuit connector | 28149874 |
You should always protect the connecting facility for the discharge unit with a DC voltage fuse. You can use a miniature circuit breaker with characteristic C or a full range fuse in utilization category gR for this purpose.
In both cases, the following specification must be adhered to:
- Minimum nominal voltage: DC 880 V
- Maximum rated current: 16 A
- Minimum breaking capacity 10 kA
Provide a facility for mechanical attachment of the discharge connection socket in the control cabinet.
