Technogym BIOSTRENGTH LINE, Руководство по техническому обслуживанию

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BIOSTRENGTH LINE: Service & Maintenance manual - rev. 2.1
Page 3.24
3.5. SEAT MOTOR MANAGEMENT FOR LEG PRESS
3.5.1. M
ECHANICS
The seat position on the Leg Press is selected using a mechanism such as the one schematically
illustrated in the figure below.
Figure 3.5.1
To adjust the seat position, the entire seat a moves freely along two bars b by means of plastic
wheels c . The seat is connected to the motor d , which has an output reducer e that drives a gear f on
a rack g , connected to the machine frame h . When the motor moves, the gear turns on the fixed
rack, thereby moving the motor and the entire seating unit. A photocell-based encoder h is
connected to the motor. On the rack are two plugs i , which activate the two normally-closed limit
switches l at the ends of the motor stroke.
3.5.2. C
ONTROLS
To adjust the seat position, the CPU board sends the motor up signal (to move the seat forward) or
the motor down signal (to move the seat back) to the LP driver board through Bio servo board. The
LP servo board powers the motor properly, which in turn moves. Due to the movement of the
motor, the photocell produces the pulses that enter the LP driver board through Bio servo board.
This cleans and filters the signal received, and sends it to the CPU board. The CPU board counts the
pulses received. As soon as the number of pulses corresponds to the desired position, it disables the
motor command signal.
The board is equipped with a microprocessor (ST6) that also contains the operating program for the
board. This board makes it possible to check the following working conditions of the motor: