39
The voltage drop of the switch is minimal (see chapter 5.1 Technical specifications). The sense inputs are
terminated at the switch, except in pulse 4 applications where the 4 continue through the output connector
on the front panel of the FT 5531.
Upon detailed analysis of this pulse requirement it becomes clear that there is a requirement for the battery
power to switch “ON“ and “OFF“ during pulse generation.
A general block diagram of the CDN 5500 and CDN 5501 unit for the NSG 5500 system could be represented
as follows.
+
-
B
Timer
control
Switch
control
Voltage
sense
B
(Optional most
newer
standards)
Switch
Picture 3-7: Block diagram of the CDN 5500 battery switch unit.
The switch has facilities for being controlled by a voltage sense circuit or a timer circuit. While it is obvious
that the control of the battery switch to the required specification requires complicated timing and monitoring
controls, all of this activity is generally transparent to the user. The control unit in the NSG 5500 manages all
of these requirements internally and automatically, as required, during pulse generation.
