Charging the DC bus circuit via ECS supply module, controlled
Question:
How is the controller (axis modules) which is connected to the ECS supply module, charged in a controlled way and what must be observed when configuring the axis modules?
Answer:
The ECS supply modules have a thyristor charging circuit for the controlled charging of the DC bus circuit to operate devices without charging circuit in the ECS network.
Basic procedure of mains connection:
Initialising: The DC bus circuit is actively decharged via the brake resistor.
Earth fault test: When the charging relay is open the system tries to charge the DC bus circuit via the thyristor. Charging current and DC bus voltage are monitored.
Charging: If no earth fault was detected the DC bus circuit is charged in a controlled way via the thyristor. The trigger phase of the thyristor is controlled depending on the charging current.
Ready for operation: The +UG relay is then closed and 'Ready for operation' is indicated at the output DO1.
Configuration of current limitation under code C0175 in theECS axis module ECSXA:
C0175 = -1- (current limitation active, default setting): ECS axis modules supplied, e. g. via a controller 9300. The internal current limitationt of the ECS axis module must be activated to avoid an overload of the mains rectifier of 9300.
C0175 = -3- (current limitation inactive, charging relay always closed): ECS axis modules supplied via ECS supply module. This setting allows a faster charge of the DC bus circuit.
