Technogym BIOSTRENGTH LINE, Service Maintenance Manual

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BIOSTRENGTH LINE: Service & Maintenance manual - rev. 2.1
Page 3.21
Figure 3.4.2
•
Motor down signal on (
↓↓↓↓
)
This is the signal generated by the CPU (pin 6-2 on connector K4) to enable the seat motor to
move the seat back (down). This signal enters the Bio servo board (pin 6-2 on connector CN7),
and is processed by the latter to pilot the seat motor with the proper supply voltage.
The control logic states that when the motor down 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
powered (-24 Vdc). Thus the motor moves the seat back (down) as long as the motor up signal is
high. The motor stops as soon as the signal returns to being low.
The figure below shows the switching of the motor signal to move the seat:
Figure 3.4.3
•
Alarm signal
This is the signal generated by the Bio servo board (pin 8-2 on connector CN7) when a surge
current is detected on the motor.
CAUTION: the board produces this signal when the motor reaches its stroke limits.
This signal is sent to the CPU board (pin 8-2 on connector K4). The CPU board disables the
motor up or motor down command that generated the alarm signal as soon as it is received, to
protect the motor from the consequences of use during a current surge.