Technogym Run Excite 500 Service Maintenance Manual page 51

RUN EXCITE: Service & Maintenance Manual - rev. 1.5
If the inverter no longer receives the feedback signal from the encoder, it stops with error code EAC
and the machine displays the "SPEED ERROR" message. If the machine is turned off and on again
it will resume operation in open loop mode, that is to say ignoring the encoder signal. Closed loop
operation can only be resumed, obviously after having resolved the problem, by resetting parameter
PAR 13 to 0.
In addition, to protect the motor from overheating, each motor phase has a thermal cut-out
connected in series. If the temperature exceeds the threshold value, the thermal cut-outs open and
interrupt the circuit. This elevation + cut-out board detects this condition as the opening of a NC
external contact. In such a case the elevation + cut-out board changes the state of a signal sent to the
inverter. When the inverter sees this signal going to 0, it halts the motor and outputs an alarm signal
to the digital plan board which displays the "THE EQUIPMENT IS BLOCKED" message.
3.2.3. T
HE SIGNALS INVOLVED
The machine uses the following control signals:
• RS-485 Signal
This is a digital signal exchanged between the inverter and the digital plan board. There is no
way to monitor its state other than through the LED on the Download board.
• Variable frequency VAC signal
This is the variable alternating-voltage signal output by the inverter (pins U-V-W) to supply the
motor. Increasing the frequency of this signal increases the motor speed. The frequency of the
sinusoidal supply voltage sent by the inverter to the motor can be viewed on the inverter
display.
• Thermal cut-out signal
Each motor phase is equipped with a normally-closed thermal cutout which opens when the
temperature exceeds a preset threshold. The 3 thermal cutouts are connected in series and exit
the motor via a 2-wire cable connected to the elevation + cut-out board (pins 4-3 of connector
X3).
The elevation + cut-out board processes this signal and sends it (pin 6-1 connector X1) to the
inverter (pins 3-6). This signal is –23.5 Vdc when the motor is cold, and goes to 0 Vdc if the
motor is overheating.
The inverter receives an external alarm signal on pin 3, which under normal conditions must be
24 Vdc. When this input signal goes to zero the inverter detects the alarm, halts the motor and
sends an alarm signal over the RS-485 line to the digital plan board.
• Encoder Pulses
The encoder is only installed on the 700 / 700E and 900 / 900E models. The rotation of the
motor causes a train of pulses between 0 and 5 Vdc to be sent (pins 3-2 of patch connector H
and pins 3-4 of patch connector H) to the inverter. This provides a feedback signal of the
effective motor speed, which is sent to the inverter (pins 9-10 and 11-12). When measured with
a multimeter, the signal is 4.8 Vdc with the motor halted and 2.6 Vdc when the motor is
running.
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