Electrical Protection Devices - Siemens SICHARGE UC 150 Operating Instructions Manual

Routing cables between the charging station and the charge point
The DC charging cables from the charging station to the SICHARGE UC dispenser are installed by the end user. You can find
details on connections, cable types, and dimensioning in the project-specific instructions.
Additional information
You can find more information on connecting and operating charge points together with the SICHARGE UC charging station in
the following documentation:
• SICHARGE UC dispenser operating instructions
• You can find the current documentation in the Siemens Industry Online Support
(https://support.industry.siemens.com/cs/us/en/ps).
3.5

Electrical protection devices

The charging station is equipped with several electrical protection devices.
Overvoltage protection
The charging station has comprehensive protection against overvoltages from the distribution network. Voltage-dependent
resistors with short response times protect each line conductor of the power cable against overvoltages. In addition, the control
system of the charging station constantly monitors the mains voltage. If the mains voltage exceeds or falls below the
permissible limits, the charging station interrupts a charging process in progress or does not start the charging process.
Overload protection
A separate system constantly monitors the input current and the output current in the charging station. The charging station
supplies the system with power directly from the input voltage. This allows the system to monitor currents even when there is
no output voltage.
The controller constantly monitors the input current and the output current. If a measured current value exceeds the preset
limits, the control system opens the main contactor. The open main contactor separates the charging module and the vehicle
electrically. No more charging current flows between the charging station and the vehicle. A fuse at the input protects the
charging station against overcurrent. A fuse also protects the electric vehicle against overcurrent at the output.
Insulation monitoring
To ensure that an electric vehicle is safe, the vehicle's high-voltage electrical system must not be grounded via electrically
conductive material. For this reason, an insulation monitoring device in the charging station constantly monitors the
resistance between the DC+ and DC- contacts to ground. If this resistance falls below the permissible limit, the insulation
monitoring device switches off the output current and disconnects the AC-DC converter from the AC input. In addition, the
insulation monitoring device sends a message to the Siemens control system. For safety reasons, the charging station
switches to the safe Emergency Stop state. In the Emergency Stop state, the charging station can no longer be operated. To
reset the charging station, the user must confirm the alarm. When the alarm disappears, the charging station is ready for
use again.
Operating Instructions | SICHARGE
21