Connecting a discharge resistor to the DC link

There are two ways of discharging an energy storage unit of type MDC90A-0120-.. using a discharge resistor. The discharge resistor can either be connected to the brake chopper of the MDP92A power supply module or directly to the DC link. The advantage offered by the connection to the DC link is that a discharge can also take place if the brake chopper is not available due to a device defect or if there is no supply voltage.

When connecting a discharge resistor to the DC link, make sure there is a way of connecting and disconnecting the resistor to/from the DC link manually or by using a controller.

To discharge 1-2 energy storage units of type MDC90A-0120-.., use the discharge resistor from the following table. To discharge 3-4 energy storage units of type MDC90A-0120-.., use two discharge resistors of this type connected in series.