Technogym BIOSTRENGTH LINE, Service Maintenance Manual

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BIOSTRENGTH LINE: Service & Maintenance manual - rev. 2.1
Page 3.27
powered (-48 Vdc). Thus the motor moves the seat forward 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 up signal to move the motor:
Figure 3.5.2
•
Motor down signal on (
↓↓↓↓
)
This is the signal generated by the CPU (pins 6-2 on connector K4) to enable the seat motor to
move the seat back. This signal enters the LP driver board (pins 3-6 on connector CN3), 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 (48 Vdc). Thus the motor moves the seat back 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 3.5.3
•
Alarm signal
This is the signal generated by the LP driver board (pins 4-6 on connector CN3) when a
hazardous situation (surge current, short-circuit or blocked rotor) is detected on the motor, or
when a limit switch contact is open. 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