216NG62A HESG441634R1/K HESG216876 processor module

In order to supply the electronic units with power the protection must be connected to an external auxiliary d.c. supply (station battery). The auxiliary d.c. supply unit 216NG61, 216NG62 or 216NG63 (DC/DC converters) steps the station battery voltage down to 24 V and provides electrical insulation between input and output voltages. The 24 V supply is distributed to the units inserted in the protection equipment rack via the B448C parallel bus. The 216NG61, 216NG62 or 216NG63 power supply unit also supplies the electronic circuits on the I/O units. A 216MB66 equipment rack can be equipped with just one or with two redundant 216NG61, 216NG62 or 216NG63 auxiliary d.c. supply units. Redundant units can be connected to the same or to two different station batteries. All software configuration, i.e. selection and setting of the protection functions and the assignment of signals to the inputs and outputs, is performed via the RS-423 serial interface on the 216VC62a processing unit. The corresponding connector is the 25 pin socket X2 on the front of the unit, to which a personal computer is connected.