|
OVERVIEW
In
brief, the
system is mainly
formed of a control
cabinet and an oven.
The oven is where 24
UUT are placed at a
time and subjected
to a certain
temperature. The
control cabinet
provides control
over all required
functions.
The control cabinet
contains some main
parts as the four
variacs, four
switches and twenty
four shunts. As test
is initiated by
software installed
to PC, power is put
on and suitable
power is supplied to
blower motor (fan)
that circulates air
inside the oven,
heating resistance ,
variacs and relays.
Four voltage
dividers and twenty
four shunts provide
voltage and current
measurements
respectively, to PC
through signal
conditioner and DAQ
card. Heating
temperature is
specified by the
temperature
controller which has
a digital display
from which you can
set the temperature.
Inside the oven, two
temperature sensors
exist. One is
connected to the
temperature
controller and the
other is connected
to the PC through
signal conditioning
card and DAQ card.
These sensors are to
insure that oven
will be heated to
the specified
temperature.
The oven temperature
will be read by the
software. Maximum of
twenty four UUT can
be placed inside the
arrestors oven before
attempting to test.
When test is started
by software, power
and heater are put
on. ASD controller
puts the four
variacs on and turns
on the heater
(activates the
temperature
controller) to start
heating the oven to
the temperature
specified by
temperature
controller. Due to
the UUT
specifications,
order is conveyed
from software, PC to
the ASD controller.
Measurements are
taken through
voltage dividers and
shunts and fed back
to the PC. |
