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is input to the CPU board. If the user is in difficulty and detaches the "Safety switch" from the
display by pulling the attached cord, the contact opens and the CPU board detects the transition and
the "EMERGENCY ACTIVATED" message appears on the display. In addition, the signal also
passes through the power isolating board which cuts off the power supply to the up-down motor and
the inverter.
The machine is equipped with a larger flywheel than the previous models, to allow for
less abrupt stopping of the tread belt in response to a machine malfunction or the
emergency button being pressed.
3.1.11. D
ECK POSITION SENSOR
This device prevents any movements of the tread belt or machine incline if the running deck is not
opened out in the working position.
It consists of a magnetic sensor on the fixed part of the machine frame and a magnet on the moving
part of the frame comprising the running deck. When the machine is open with the deck in the
working position, the magnet is aligned with the sensor and closes a contact. Otherwise, the sensor
does not detect the presence of the magnet and the contact is open. The CPU which receives these
signals communicates with the power isolating board, which inhibits all machine movements in the
case of an open contact.
3.1.12. P
OWER ISOLATING BOARD
This board cuts off the power supply to the components that actuate the machine movements: up-
down motor and inverter. When an emergency condition occurs, the power isolating board
interrupts the power supply to the up-down motor and to the inverter which drives the tread belt
motor, thereby ensuring that all movements are inhibited by physically isolating the power supply.
This board enhances the safety of the machine, because activating an emergency not only causes the
condition to be signaled via SW to the CPU, but also interrupts the power supply to the two
isolating relay coils on this board, thereby shutting off the power supply to the moving parts.
The power supply to the relay coils is controlled not only by the emergency button contact, but also
by a monostable timer which receives a trigger signal from the CPU to indicate its correct
functioning. If this signal changes frequency or fails to arrive for a certain period, the timer output
changes state, de-energizing the relays.
The power isolating board also provides a feedback signal to the CPU, informing it about the
emergency status. This is simply an indication of the emergency-activated state, confirming to the
CPU that the board has correctly responded to the emergency request.
The power isolating board also includes three LEDs:
• Yellow LED: indicates the status of the 5 Vdc supply, and is illuminated if the voltage is
present.
• Green LED: indicates the status of the 12 Vdc supply, and is illuminated if the voltage is
present.
• Red LED: indicates the emergency status of the machine, and is illuminated if the machine is
not in an emergency condition.
Page 3.4
SPAZIO FORMA: Service & Maintenance manual - rev. 1.0
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