The FC350BJ/110V
Controller
Controller Design
SIEG motor controllers listed have similar design
characteristics. Most of the differences are in the low voltage
power supply and interlock systems. The following description is for
the model with the most features, the FC350BJ/110V.
The line power comes into the DC rectifier. The positive output
of the rectifier goes through terminal 2 to the positive terminal of
the motor. The voltage passes through the motor and is returned to
terminal 1. From terminal 1 it is directed to two power mosfet
switches. When the switches are turned on, power returns to the
negative terminal of the rectifier and power is delivered to the
motor. When they are turned off, no current flows and no power is
delivered to the motor. The switches are controlled by a pulse width
generator. The wider the pulse, the longer the switches are on and
more power is delivered to the motor. The width of the pulse is
basically set by the power adjust potentiometer which can vary it
from zero to full. Within this part of the system are feedback
circuits that stabilize performance with current and voltage
sensing.
There is a current overload system which senses the current
through the motor and shuts down the controller if the current
exceeds a preset level.
Controller
Adjustments
There are 5 on-board
adjustments.
Two of them relate
to the current overload interlock system. One controls the set
point and the other sets the motor current level that will activate
the system.
Three relate the
speed selection and stabilization. Two interact with the current level. One
sets the level for the onset of control and the other sets the
insertion level. The third sets the amount of voltage feedback.
Final Test Program
A controller can be
considered to be functional if: (1) if the speed is stable at
different set levels over a range of load conditions, (2) The
output is stable over an expected range of line voltages, (3) the
output interlock circuits
function properly and (4) is capable of passing a short endurance test.
Each board is fully
tested to these criteria before it is returned to the owner.
A full report of the measurements taken is included with the returned
board.
A pdf of a final
test report can be seen by
clicking
HERE.
The form used and the test limits are different for different models
- each model is thoroughly tested as dictated by it's design.
|
|
