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CHAPTER 2 THEORY OF OPERATION
Effective
09/2005
BALANCER COMPONENTS
UPPER DISPLAY
The upper display is made up of 4 major components. Main processor, Power Supply, Digital Display, Keypad.
The upper display processes all information along with providing all electrical requirements to all sub compo-
nents.
MAIN PROCESSOR PCB
The microcontroller normally takes its instructions from the
FLASH memory. The 40-pin IC socket is merely
used to transfer the program from an EPROM to the FLASH memory. Unlike EPROMs, FLASH memories do
not require windows for UV light in order to delete data - they can be cleared and programmed electrically.
Therefore the chips of the FLASH memories can be incorporated in economical SMD enclosures made of
plastic, which can be soldered onto the PCB. Unless otherwise stated in the program revisions, new program
versions can be installed without the need for adjustment. The main processor receives its power from the
power supply pcb and distributes the power to the encoder, transducers.
POWER SUPPLY PCB
The power supply pcb receives 9VAC from the power adapter. The power then passes through a bridge
rectifier converting it to DC power. This 12VDC is used to stop the shaft via the brake solenoid. The 12VDC
is sent to a voltage regulator that reduces the voltage to a clean steady 5VDC that is used throughout the
balancer.
KEYPAD
The keypad is used to input data into the display pcb. It connects directly to the display pcb via ribbon cable.
DISPLAY PCB
The display pcb receives power directly from the power supply pcb. It passes 5VDC to power the encoders
for both input knobs and the tone generator and the LED display. It receives the information from the main
processor pcb via the power supply pcb. This information is passed back to the processor via the power
supply.
TEMPERATURE SENSOR
The system has a new force guidance structure (patent pending). The forces at the measuring transducers
have been reduced, thus achieving good long-term stability and high measuring accuracy. The pre-
tensioning of the transducers is achieved by two leaf springs. On the vibratory system the measuring trans-
ducers are very close together so that the difference in temperature is only slight. The current vibratory
sensor has a temperature sensor. The transducers can therefore be measured by
one
temperature sensor
and taken into account in a fraction of a second. The temperature sensor is attached to the vibratory plate by
means of a U-shaped spring.
TRANSDUCERS
The transducers are installed such that it forms a virtual transducer on each end of the shaft. This gives the
balancer greater accuracy along with mininmal amount of erroneous readings. Both measuring transducers
are arranged in one plane. The
rear
transducer picks up the alternating forces of the left-hand virtual measur-
ing plane and is supported on the machine housing. The
front
measuring transducer is clamped between the
vibratory tube and vibratory plate, and transforms the alternating forces of the right-hand virtual plane into
electrical signals.
VOLTAGE REGUALTOR
Thebalancer is capable running off of Snapon’s versapack battery packs used to power the hand tools. The
balancer incoporates an internal voltage regulator so that the balancer can accept either the 12 Volt, 14.4 Volt or
18 Volt battery packs. These batteries are rechargeable using Snapon’s external battery charger. The balancer
WILL NOT recharge these batteries.