Charging and discharging the HV circuit capacitors

The HV circuit capacitors in the inverters must be charged and discharged via an external charging device.

The HV circuit capacity is 300 µF in total (75 µF per inverter).

The charging- and discharging device does not part of the RACING KIT and must be designed by the user.

DANGER
	Danger to life from electric shock! After switching off the HV circuit, the buffer capacitors for the DC bus can still have a charge and lead to a life-threatening DC voltage if they are not discharged via an external circuit. Steps to prevent: Prior to all work on the device, the HV power supply is to be separated from the main switch and secured against restarting. After switching off, expect a discharge time of at least 30 minutes. Measure the terminal voltage, e.g. in the HV DC bus between the HV+ and HV- terminals to ensure that the terminal is voltage-free. Caution: A voltage-free state is not signalled! Use external discharge circuit. See 'Calculation example – discharging circuit'.

DANGER

Danger to life from electric shock!

After switching off the HV circuit, the buffer capacitors for the DC bus can still have a charge and lead to a life-threatening DC voltage if they are not discharged via an external circuit.

Steps to prevent:

Prior to all work on the device, the HV power supply is to be separated from the main switch and secured against restarting.
After switching off, expect a discharge time of at least 30 minutes.
Measure the terminal voltage, e.g. in the HV DC bus between the HV+ and HV- terminals to ensure that the terminal is voltage-free.
Caution: A voltage-free state is not signalled!
Use external discharge circuit. See 'Calculation example – discharging circuit'.