RUN MED: Service & Maintenance Manual - rev. 1.0
3.1.5. CARDIO RECEIVER
This board manages the signal received from the telemetric transmitter used by the person
exercising. It receives the power supply signal from the display board and outputs a negative logic
pulse for every heart beat that is detected: the signal level is normally 5 Vdc, with a pulse at 0 Vdc
(having a width of approximately 30 msec) at each heart beat.
The receiver reception area is approximately a circle with a 1 m radius. If there is electromagnetic
noise (produced by high voltage lines, radio transmitters, monitors, motors etc.) within this area, the
receiver becomes saturated and no longer receives any signal.
3.1.6. EMERGENCY SWITCH
This is the user safety device. It consists of 2 microswitches connected in series, which can be
tripped either by pressing the emergency button or by pulling a cord clipped to the garment of the
person exercising.
The emergency switch, which provides a NC contact, acts on both the display board and the AT
driver. When the emergency is tripped the AT driver disables the operation of the tread belt and
elevation motors. The display board also detects tripping of the emergency switch, upon which it
interrupts the exercise and shows the “PRESS ANY KEY…” message on the display.
To resume normal machine operation, it is necessary to press any key on the display.
3.1.7. BELT MOTOR
An asynchronous three-phase motor which, by means of a pulley and poly-v belt, turns the driving
roller of the tread belt. Each motor phase is equipped with a normally-closed thermal cutout which
opens when the temperature exceeds a preset threshold, in order to safeguard the integrity of the
motor. The 3 thermal cutouts are connected in series and reach the AT driver as a NC external input
signal. When this contact opens, the AT driver generates an alarm.
It is equipped with a high inertia flywheel, to permit more gradual deceleration of the tread belt in
the event of a power outage or emergency stop.
ATTENTION: dangerous voltages are present at the motor and flywheel.
With the exception of the 500 model, the motor is equipped with an encoder that provides a
feedback signal of the effective motor speed. This enables a closed-loop speed control, by adjusting
the frequency of the sinusoidal voltage driving the motor.
The tread belt motor has a power of 1.85 kW (2.5 hp).
3.1.8. ELEVATION MOTOR
This is a linear actuator equipped with 24 Vdc motor, integral reduction gear and a rod that is
pushed backward and forward by the motor. This rod acts upon a frame connected to the front
wheels of the machine: when the rod moves so does the frame, thereby lowering raising the
machine.
The actuator has a built-in Hall effect sensor which acts as an encoder, generating pulses when the
motor moves. This furnishes a feedback signal on the motor movements, which is used for tracking
the position of the rod and hence the elevation of the machine.
Page 3.3
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