Technogym BIOSTRENGTH LINE, Service Maintenance Manual

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BIOSTRENGTH LINE: Service & Maintenance manual - rev. 2.1
Page 3.30
3.6. WIRE ENCODER MANAGEMENT
3.6.1. M
ECHANICS
The wire encoder is located inside the weight stack, attached to a later column, with the wire
fastened to the first plate in the weight stack to measure its position.
Figure 3.6.1-1
Moving the weight stack shortens or lengthens the wire, and the encoder outputs a number of pulses
to the Bio servo board in proportion to the linear movement of the wire.
3.6.2. C
ONTROLS
The pulses produced by the encoder are read by the Bio servo board and this, using the FPGA,
converts them into a RS232 serial signal that is sent to the CPU board. The CPU board uses this
serial signals to detect the top plate position and hence to show the ROM, reps, sets and power of
the exercise in progress.
The section has a 4-position dip-switch, used to select (in binary mode) the number of pulses the
encoder produces for each mm the wire is moved.
CAUTION: Keep these dip-switches set to position 0100, which corresponds to 2
pulses/mm.
Each time the power supply is switched on, the CPU board sends a reset signal to the Bio servo
board to reset the initial value of top plate position counter.
3.6.3. T
HE SIGNALS INVOLVED
The machine controls the top plate position via the CPU board, the Bio servo board and the encoder
as shown in the figure below: