Operating instruction and technical description
BA EV tester type 2 - 2.0
©
Walther-Werke Ferdinand Walther GmbH
page 7 of 10
Photos: resistance coding of the charging cable inside the charging plug
The information regarding the cable cross section coding is evaluated inside the charging device and is af-
terwards transmitted to the electric vehicle as PWM signal, together with other parameters. The width of the
PWM signal depends on the preset coding.
Via the same signal also the charging process is controlled by the electric vehicle and the charging current is
switched on or off via the contactor which is integrated in the charging device.
4.4 Checking the PE connection between PWM and vehicle
To check the PE connection, the PE switch has to be operated. Thus the connection between PE and CP is
interrupted and the charging process should be switched off. Now the charging device should no longer react
to operating the switches "communication status EV (connection CP)" B, C or D. Switch A is not assigned.
4.5 Simulation of vehicle status B, C, D
The vehicle status can be simulated by means of different switch positions of the switches "communication
status EV (connection CP) B, C, and D". The switch positions shall have the following meanings:
EV status and switch positions
Status B
Switch B
EIN/ON
Status C
Switch B and C
EIN/ON
Status D
Switch B and D
EIN/ON
Switch A has no function.
Photo: Switch for communication status EV
By operating switch B the vehicle status B is simulated. In this status the electric vehicle is connected to the
charging device and is ready to be charged (PWM signal: 9 V).
