Siemens SICHARGE UC Operating Instructions Manual page 28

Description
3.5 Electrical protection devices
Insulation monitoring
Insulation monitoring is provided by the upstream SICHARGE UC charging station.
To ensure that an electric vehicle is safe, the high-voltage electrical supply system of the
vehicle must not be grounded using an electrically conductive material. An insulation
monitoring device in the upstream SICHARGE UC , therefore, constantly monitors the
resistance between the DC+ and DC- contacts to the protective earth (PE). If this resistance
falls below the permissible limit value, the emergency cable is triggered and the charging
process is stopped immediately. The charging controller displays the alarm message "Ground
fault found". For safety reasons, the charging station switches to the safe EMERGENCY OFF
state. In the EMERGENCY OFF state, the operation of the SICHARGE UC Dispenser is not
possible. When the alarm has been reset, the SICHARGE UC Dispenser is ready for operation
again.
The EMERGENCY OFF state is automatically reset when the insulation fault has been rectified.
Contact the electrician in charge if the EMERGENCY OFF fault persists.
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SICHARGE UC Dispenser
Operating Instructions, 06/2023, A5E50235695-AE