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BIOSTRENGTH LINE: Service & Maintenance manual - rev. 2.1
Page 3.14
During the initial reset procedure of the machine, the weight stack motor moves until the zero
sensor reed detects the passage of the magnet connected to the first weight stack pin selection brush.
This position corresponds to the home reference (zero) of the weight stack motor position, and all
other positions will be gauged based on it.
WARNING: on some machines a resistor 0.5Ohm/25W is mounted in series to the motor
in order to reduce the peak current at the starting point.
3.3.3. T
HE SIGNALS INVOLVED
The machine controls weight selection via the CPU board, the Bio servo board and the weight stack
motor as shown in the figure below:
The following signals come into play:
•
Motor up signal on (
↑↑↑↑
)
This is the signal generated by the CPU (pin 3-1 on connector K4) to enable the weight stack
motor to move counter-clockwise, to select a higher weight. This signal enters the Bio servo
board (pins 3-1 on connector CN7), and is processed by the latter to pilot the weight stack motor
with the proper supply voltage.
The control logic states that when the motor up signal is low (~ 0 V) the motor is stopped and
thus not powered (0 Vdc), while when the signal is high (~ 4 V) the motor moves because it is
Pulses
Bio servo board
↓
CPU board
Hall sensor
↑
Alarm
Motor
Zero
switch
3-1/K4
5-1/K4 7-1/K4 9-1/K4
3-1/CN7
5-1/CN7 7-1/CN7
9-1/CN7
1-2/CN1
PT1
4-5-6/CN1
Pulses
3/K5-1/K4
Zero switch
17-1/CN7
1-2/CN4
Содержание BIOSTRENGTH LINE
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