Product Description:
The control unit includes the following main blocks:
- Micro controller 80C198 for controlling and firing
- Actual DC current measurement with an ACcurrent transformer.
- RS485 interface to the converter's controller board SDCS-CON-x.
The software for the field current control is stored in the ROM memory of the 80C198. The control is done by using a PI structure for the current controller. All parameters needed for the control or for scaling reasons (selection of burden resistors) are stored in the non-volatile memory of the armature converter and transferred to the field controller during each initializing process via the RS485 link.
The Node number is always fix coded to Node number = 1. The output Iact represents the actual field current,
which is measured via the AC transformer, then rectified and transferred into a voltage signal with burden resistors. The burden resistors, as mentioned before, are adapted by the board itself depending on the setting of the nominal field current The resulting burden voltage can be measured at test terminals beside X14:. The 2.2 KΩ resistor allows a short circuit at the terminals; the external measuring device should have an internal resistance higher than 1MΩ.
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