RUNRACE : Service & Maintenance Manual - rev. 2.0
Page 3.2
3.1.2. CARDIO RECEIVER
It is connected to the machine’s CPU board and receives the pulses sent by the transmitter. Its
reception area is approximately a circle of 1 meter of radius. If there is electromagnetic noise
(produced by high voltage lines, radio transmitters, monitors, motors, etc.) within its reception area,
the receiver becomes saturated and stops receiving any signal. If there are 2 transmitters within its
area of reception, it will receive signals from both, and may produce an error or irregular reading.
3.1.3. DISPLAY
This is the heart of the machine, which controls all the machine functions by executing the program
stored in EPROM. It receives information from the user (age, weight, etc.) during set-up of the
training session, from the cardio receiver (user’s heart rate), from the inverter interface board and
from the up-down interface board. It controls the speed selected with the “+” “−” keys and the
elevation selected with the “↑” “↓” keys or according to the chosen training program. It receives the
error signal from the inverter interface board and the status signal from the up-down interface board.
It consists of 2 circuit boards:
• CPU board: contains the microprocessor, and all the logic circuits for controlling the machine
and the LCD;
• LED board: contains the circuits pertaining to the display and indicators: LEDs and 7-segment
display.
The CPU board contains 2 banks of 4 dip-switches each, which are used for configuring the
machine.
3.1.4. INVERTER
This is the device which supplies the three-phase belt motor. It receives a DC reference voltage
from the inverter interface board. Variations in this voltage cause corresponding variations in the
operating frequency of the sinusoidal wave provided by the inverter to the motor phases, and hence
change the speed of the tread belt. It handles motor drive errors and, in the event of an error, shuts
down the power supply to the motor and sends an alarm signal through the interface board to the
display. The event which caused the error is memorized as an error code.
The inverter power supply is enabled by the relay activated by the emergency button. When the
button is pressed, the relay contact opens, the power to the inverter goes off and hence the belt
motor stops.
The following inverter models are used on these machines:
• Lenze 644: installed up until serial number 2042;
• Hitachi J100: installed on versions E2, E3, E4 and E5;
• Hitachi SJ100: installed from serial number 0200531.
Each inverter model requires its own special interface board, designated as follows:
• Lenze inverter interface board;
• Hitachi inverter interface board.
