User's Manual

Table Of Contents
USER MANUAL
12-10
21464-5
NORMARC 7050
MARKER BEACON
Detailed Description ©1999 Navia Aviation AS
The mains input is fused and filtered before it is rectified and smoothed. The first DC/DC con-
verter generates 28VDC output which is filtered in the next block. The filter output serves as
both battery charger and input to the +20V, ±12V and +5V DC/DC converters. V28P is tem-
perature compensated to give 26.4V at 50°C, linearly increasing to 29.6V at -30°C.
The voltage (V28P) from either the AC/DC section or the battery is passed through an on/off
switch and separate fuses to the secondary DC/DC converters. Here +20V, ±12V and 5V are
created in one single and one triple output DC/DC converter. All outputs are lowpass filtered
in LC filters.
The or'ing diodes on the DC outputs makes parallel coupling possible. All RMM voltage mea-
surements are done prior to these diodes to make fault tracking possible. All RMM measure-
ments are multiplexed into A_PS_[P,N] by the AMUX_A[2:0] signals.
The RMM measurements are:
12.1.4 CI1376/PB1378 Connection Interface Module Description
12.1.4.1 General description
CI 1376 is the electrical backplane of NM 7050. The module has four functions:
External connections interface with over voltage protection.
Motherboard for all plug-in boards.
Transmitter change over.
Battery protection against deep discharge
Signal Measurement
I28P_MEAS
Total current in V28PP
IBATT_MEAS
Battery current in V28P
SIGN_I28P
Charge/discharge info to the
SIGN_IBATT
current measurements above
V*_MEAS
Voltage in corresponding V*