User's Manual Part 1

AT7400 Owner Manual Rev. 2.0 – October 2006-10-23 ANNEX A Section 7 - 6/9
Fig. 7.7: Manual bi-polar energizer breaker and the manual start switch, both located on the bottom of the front panel.
When the POWER ON/OF switch is press, the 2.5s timer is activated energizing the coil of the secondary breaker. In
sequence the 2 rush resistors are connected in series with the AC mains. 2.5s pass by and the breaker is disabled
opening its contacts protection the rush resistors. At this point on time, the rush peak current is over and was avoided
to cause over current stress over the mains, sometime activating the protection circuits
On long term the secondary breaker is no longer activate, leaving the main breaker is series with the R, S, T phases
for when the command comes relay the 208Vac to the power drawer, module 4445.
I-Rush circuit can be energized on two different ways:
(a) 2 phase of 120Vac, when the equipment is wired up for 3 phases 208Vac, or
(b) With one 208/220Vac phase plus neutral, in case the equipment is wired up for 360Vac.
7.2.4. Module 4147: Battery Charger, DC-DC Converter, Fuses Sensor
The sub-module 4147 is responsible for the DC supply to the MCU, main control unit, module 4459. The sub-module
4147 is powered by either (a) +32V out from the exciter drawer, module 4452, or (b) from the 12V/7A battery located
at the bottom of the rack transmitter.
The voltages delivered to this module are: +15V and +8V, both generated out from the DC-DC converter, the battery
charger is also located on the same module. The +15V is also routed to power the 2 directional couplers, module
4166 and module 4429.
The fuse sensor detects if the 3A fuse is not open. This fuse protects the fan located on the top of the transmitter
rack. When it is detected open, the MCU shut down the transmitter and alarm.