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BIOSTRENGTH LINE: Service & Maintenance manual - rev. 2.1
Page 3.3
3.1.8. D
ISPLAY
This is the “brain” of the machine, and manages all functions according to the instructions received
from the program recorded in the EPROM. The TGS interface (TLCBR and key reader) is built-in
to read exercise data and write exercise feedback on a TGS key, via RS 232 serial port. It controls
all external devices (encoder, weight stack motor, solenoid for the additional weight and, where it is
available, the seat motor) using the Bio servo board to set up the machine as request and shows the
exercise data (weight lifted, speed and power).Upon choosing the exercise, it receives information
from the user via keyboard or via TGS.
If the machine is not used for a time interval specified by the user, it carries out a reset procedure,
during which it tests the efficiency of the external devices connected and sets the motors to their
default values. This reset procedure is also the first to take place each time the machine is switched
on.
It comes complete with buffer battery to provide constant power to a memory containing the
machine configuration data.
3.1.9. B
IO
S
ERVO
B
OARD
It is the board that interfaces the CPU boards to the electronic components.
The board receives continuous power from the power supply, and sends it to the display and
encoder. A green SMD LED, situated in the FPGA section, lights when the board is receiving power
correctly. The board also receives, as input, the 18Vac/10A secondary power from the transformer,
which stabilizes at 24 Vdc for the solenoid, the weight stack and, where available, the seat motor
and 12 Vdc for the internal logic. It is equipped with a 12A fuse to protect it from any short-circuits
on the input voltage.
It has 4 independent sections and each of those manages the electronic components. The 4 sections
are easy identifiable from the position of the connectors to which the electronic components will be
connected:
3.1.9.1. FPGA
section
This is the section that receives the encoder signals and processes them. The processed data, that
represents the top plate position, are sent to the CPU via a RS-232 serial connection.
3.1.9.2.
Solenoid interface section
This is the section that manages the interface between the CPU board and solenoid. It receives the
solenoid command signal from the CPU board, and based on this signal either supplies or cuts off
working voltage to the solenoid. It generates a status signal as feedback for the command received.
3.1.9.3.
Weight stack motor section
This is the section that manages the interface between the CPU board and weight stack motor. It
receives the motor command signal from the CPU board, and based on this signal either supplies or
cuts off working voltage to the motor. It generates an alarm signal if any problems occur on the
motor (overcurrent). It receives the motor encoder signal, which it filters, squares and sends to the
CPU board.
The board uses to power the motor 2 16A relays mounted on a socket.
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