Siemens SICHARGE UC 150 UL Installation And Operation Manual page 29

Installation and Operations Manual | SICHARGE UC 150 UL Plug-in Dispenser
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 with 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, 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 controller that shows the "Ground Fault Detection" alarm message. 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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