4.2 Functions
Device description
5178 / 03/2021 en
BENNING EV 3-2
16
Rotary switch “CP-Status/State” for vehicle simulation
With the rotary switch “CP-Status/State” you can simulate different vehicle conditions. By means
of the switch position, different resistance values and a diode are switched in the device
between the CP and PE contacts.
The communication signal (CP signal) is intended to control the charging process between the
charging station and the vehicle (EV). For this purpose, the charging station applies a square-
wave signal of 1 kHz to the CP contact of the charging plug. Depending on the operating status,
the PWM (pulse width modulation) signal is loaded differently by the vehicle and its amplitude is
changed.
Switch
position
Simulation
Description
Resistance
(CP-PE)
PWM voltage at
CP contact
A
No vehicle (EV)
connected.
No power supply from
charging station.
Open
±12 V, 1 kHz
B
Vehicle (EV)
connected but not
ready for charging.
Charging station
detects vehicle, but no
power is provided.
2 740 Ω
+9 / -12 V, 1 kHz
C
Vehicle (EV)
connected and ready
for charging.
Ventilation of the
charging area is not
required.
Charging station
provides power supply
for vehicle.
882 Ω
+6 / -12 V, 1 kHz
D
Vehicle (EV)
connected and ready
for charging.
Ventilation of the
charging area is
required.
Charging station
provides power supply
when ventilation of the
charging area is
given.
246 Ω
+3 / -12 V, 1 kHz
E
Error, short-circuit CP-
PE via internal diode.
Charging station stops
the power supply and
unlocks the charging
cable within 30 s.
-
-
Table 5:
Switch positions of the “CP-Status/State” rotary switch
Recommended test sequence
• Switch positions A-B-C: simulation of the charging process without ventilation of the
charging area
• Switch positions A-B-D: simulation of the charging process with ventilation of the charging
area
• Switch position E: error simulation
