Operating Instructions
| SICHARGE UC Dispenser UL
3.5 Electrical protection devices
The SICHARGE UC dispenser is equipped with multiple electrical protection devices.
Note
No EMERGENCY OFF button on the SICHARGE UC dispenser
The EMERGENCY OFF button is installed directly on the connected SICHARGE UC charging station.
On the outside of the SICHARGE UC dispenser, attach a visible map with the location of the connected
SICHARGE UC charging station. All persons in this area must be instructed on how to act in an emergency.
Overvoltage protection
The overvoltage protection is provided by an upstream SICHARGE UC charging station.
The SICHARGE UC charging station offers 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 main voltage exceeds or falls below the permissible limits, the charging
station interrupts the 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 SICHARGE UC dispenser.
The SICHARGE UC dispenser supplies the system with power directly through the input voltage. This allows the
system to monitor currents even when there is no output voltage.
The charge 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 electrically
separates the charging module and the vehicle. The charging current ceases to flow between the SICHARGE UC
dispenser and the vehicle. A fuse at the input protects the SICHARGE UC dispenser from overcurrents.
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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