Step 1

1. Disconnect the connection between MDP92A or MDE90A and the energy storage unit, e.g. via the DC contactors using the controller.
2. Disconnect the system from the AC grid. Make sure that you disconnect all relevant connections if there are several AC connections.
3. Make sure that all the connections that are now opened cannot be reconnected during service work.
4. Make sure that the supply unit is de-energized at all poles using a suitable measuring instrument. Perform the measurements at all locations shown in the overview on the inside of the door.
5. For the low-temperature variant and high-temperature variant, you also need to ensure that all poles are de-energized at terminal X10.