Difference between revisions of "Electronic Fundamentals"

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== The PowerControl Ergometer==
 
== The PowerControl Ergometer==
  
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The Power Control Ergometer is the new version of the Power Control and can be used only with the new ergometer control. It receives the HR data displays the measured data, receive the HR data , controlling the eddy current brake and transmitting signals to the computer via a serial cable.  
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The PowerControl Ergometer is the new version of the PowerControl and can be used only with the new ergometer control. It receives and displays the HR data.  
  
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To employ the PowerControl on the Ergometer one has to ensure that the zero offset and slope are correctly entered. All other values such as slope, circumference of tire, etc. are in this case not applicable and has to be changed in the sttings of the ergometer software.  
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To employ the PowerControl on the Ergometer the user has to ensure that the zero-offset is correctly entered. All other values such as slope, circumference of tire, etc. are in this case not applicable and has to be changed in the settings of the ergometer software.  
  
  
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:* Bottom Line: Speed [km/h], Cadence [rpm].
 
:* Bottom Line: Speed [km/h], Cadence [rpm].
 
:If no signal from a sensor is picked up, the display shows “-“ for this data instead of a number (for example “Heartrate -“ if heartrate sensor is not paired/connected).
 
:If no signal from a sensor is picked up, the display shows “-“ for this data instead of a number (for example “Heartrate -“ if heartrate sensor is not paired/connected).
 +
 +
===Sensor Pairing===
 +
You need to pair the PowerControl Ergometer with the heartrate sensors. If you don’t do this, no heartrate data will be received by the PowerControl Ergometer and can't be saved in the ergometer software.
 +
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Please follow these steps:
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:* Connect the ergometer to the power supply.
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:* Switch on heartrate sensor by putting the belt on your chest. Please moisten the electrodes to improve contact.
 +
:* Switch on the PowerControl by pressing the MODE and PRO buttons simultaneously.
 +
:* Select the heartrate sensor you like to pair: Possible heartrate sensors are SUUNTO or the PLUS (the PLUS-SRM heartrate sensor belongs to the ergometer standard accessory)
 +
:* Press SET for searching the heartrate sensor; the search bar of the display shows the progress of the search and the antenna symbol is flashing.
 +
:* If the heartrate sensor is found, the search bar is completed, the antenna symbol is displayed continuously and in the bottom line the sensor’s serial number is displayed.
 +
:* Hold MODE for about 3 seconds to get back in the main display chart, the heartrate should be displayed after a short time.
 +
 +
If no signal is picked up, please check and repeat pairing from the beginning:
 +
:* Damp the heartrate belt at the skin sensors to ensure that the heartrate data can be recorded by the heartrate belt. 
 +
:* If the sensor is working e.g. with another receiver (e.g. heartrate watch, PC8).
 +
:* Check the battery of the hartrate sensor.
 +
:* If it is still not working, please get in touch with the SRM Service Center.
  
 
===Control test with PowerControl keys===
 
===Control test with PowerControl keys===
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:*PRO (long): Test Resume
 
:*PRO (long): Test Resume
 
:*SET (long): Test Stop
 
:*SET (long): Test Stop
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===Sensor Pairing===
 
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You need to pair the PowerControl Ergometer with the power, speed and heartrate sensors.If you don’t do this, no data will be received by the PowerControl Ergometer for any of the sensors that you want to use on your bike.
 
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Pairing the sensors with the PowerControl Ergometer will only be possible if they are switched on.
 
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:* Switch on the PowerMeter by pedaling the crank forward a few times (it will switch on when the sensor in the PowerMeter passes the magnet attached to the bottom bracket).
 
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:* Switch on the speed sensor by spinning the wheel.
 
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:* Switch on heartrate sensor by putting the belt on your chest. Please moisten the electrodes to improve contact.
 
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:* Switch on the PowerControl by pressing the MODE button.
 
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Hold PRO for about 3 seconds to enter Sensor Pairing mode. Press MODE once quickly to select the device you want to pair and press SET once quickly to tell the PC Ergometer to start searching.
 
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The Antenna symbol blinking on the right of the display shows that the searching process has started. The search bar in the middle of the display shows the progress of the search.
 
−
 
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If no signal is picked up, please check:
 
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:* If the sensor is switched on.
 
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:* The position of the magnet.
 
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:* Depending on the total miles/km your PowerMeter battery might be empty.
 
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:* If it is still not working, please get in touch with the SRM Service Center.
 
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When a sensor is found, the PC Ergometer will show “Found” in the top line, alternating with the sensor’s serial number.
 
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If the pairing fails, please repeat pairing from the beginning.
 
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To pair another sensor, press MODE once quickly to get back to the device selection Menu. Continue with pairing the heart rate sensor and speed sensor.
 
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Hold MODE for about 3 seconds to leave the device pairing menu and go back to the main menu.
 
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It is also possible to program the sensor identification numbers in the SRM Windows Software. Then manual pairing is not necessary.
 
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=== Plugs ===
 
−
 
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In the following list you find the technical meanings of the plugs at the rear of the PowerControl. Please consider that the number of plugs can distinguish between the different model types. And please be careful in handling the plugs, because the pins inside the plugs are very sensitiv. 
 
−
 
−
:'''Plug of the PowerControll Ergometer'''  ([[Media:PCIV-2-ports-plug01.jpg|s. picture]])
 
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:* male, 4 pins
 
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:* Eddy current brake instructions from PowerControl to the power supply
 
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:* Charging
 
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:* Speed
 
−
:
 
  
 
<br />
 
<br />
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[[File:SRM Ergometer_Netzteil 2.jpg|thumb|Power Supply]]
 
[[File:SRM Ergometer_Netzteil 2.jpg|thumb|Power Supply]]
  
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The power supply has been especially designed to suit the SRM Performance Ergometer. The power supply changes the magnetic field in the eddy current brake very rapidly to ensure a constant rotational speed in isokinetic mode. In the isokinetic mode it is necessary to reduce the braking power to near zero when the cranks are in vertical position. In horizontal position the braking power has to be up to 4000 watts. This is necessary to maintain the predetermined rotational pedaling speed. This means that at a cadence of 120 rotations per minute the magnetic field in the brake has to be established and abolished four times per second.
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The power supply has been especially designed to suit the SRM Performance Ergometer. It supplies power to the ergometer, including the PowerControl Ergometer. The operating mode of the power supply is indicated by a blue LED display.  
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+
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The power supply operates with 220 Volts, and incorporates fuses of 1.3 A. The power point which is used for the power supply has to be well earthed (grounded) in order to avoid that the athletes become electrostatically charged. WARNING: Operation of the ergometer through an unsatisfactorily earthed power point can damage the health of the athlete and the physiologist and can also lead to wrong ECG readings.
+
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+
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The operating mode of the power supply is indicated by a green LED display. The yellow LED display indicates the operation of the brake. The yellow LED has to flash during isokinetic mode.
+
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+
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Place the power supply in dry, well aired condition. Avoid switching the power supply on and off in quick succession. Never clean the power supply with water or other fluids, the electronics will be damaged.
+
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+
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The current transmitted by the power supply is +/- 24 Volt. The power supply charges the PowerControl unit. If the PowerControl is not charged over a period of about 3 months, it may lose the programmed operating parameters. In this case the user has to charge up the PC via the dedicated charger and enter all operating parameters again with the software SRMWIN.  
+
  
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The power supply does usually not need any maintenance. Wipe with a dry cloth and be sure that no moisture gets into it.
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Place the power supply in dry, well aired condition. Avoid switching the power supply on and off in quick succession. The power supply does not need any maintenance.
  
 
==Light Barrier==
 
==Light Barrier==
  
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The light barrier measures the speed of the fly masses. She is a necessity for the power measurement. If speed is not measured correctly, the power measurement is not correct either. The displayed speed values in the SRMWin-Software - e.g. during a performance test – do not correspond to real speed values.
+
The light barrier measures the speed of the fly masses. It is a necessary for the power measurement. If speed is not measured correctly, the power measurement is not correct either. The speed values are displayed in the SRM ergometer software and on the PowerControl Ergometer. The speed data do not correspond to real speed values.
  
 
==Adjustments==
 
==Adjustments==

Latest revision as of 11:22, 27 January 2021

The interaction between the electrical components of the SRM – High Performance Ergometer allows precise power control for performance diagnostic examination and scientific data acquisition.

  • The SRM - PowerMeter Science

  • Reading slope and serial number

  • The Power Control IV, abbreviated as PC on the handlebars in the photo

  • Connecting the Ergometer (Ports)

  • Connecting the Ergometer (Ports)

  • |Connecting the Ergometer (Ports)

  • The PowerControl Ergometer

  • The PowerControl Ergometer

  • Rear PowerControl Ergometer with one connection

  • Power supply

  • The gearbox

  • Connecting the Dexlan Ethernet hub

  • Plug PowerControl

  • Grounding


The PowerMeter

The PowerMeter is the central part of the ergometer. It is responsible for measuring the power output. The PM transmits a particular frequency (500 - 12.000 Hz) proportional to the actual torque and also a frequency proportional to the actual angular velocity via a transmitter to a receiver located on the frame. The signal is digital to eliminate transmission errors. Power supply of the PM is by a Lithium battery lasting 1800 hours.

Important: If there is no torque on the chain, the PM does not measure any frequency, which means the angular velocity is zero. Setting this zero offset correctly is important to receive the right measurement of power output.

In the factory we calibrate all SRM PowerMeters in order to determine the frequency change of PowerMeter when changing the torque on the cranks. This frequency is called slope. This slope, measured in Hz/Nm, has to be entered initially into the PowerControl. The slope only has to be reentered if a different PowerMeter is employed, which normally has also a different slope.

  • The SRM - PowerMeter Science

  • Reading slope and serial number


Connecting the Ergometer (Ports)

  1. Power Supply
  2. Serial Port
    The serial port is only for the external control by CPX/CPET, EKG or other medical devices by the so called “ergoline” protocol. The idea is to specify the protocols in the CPX/CPET or EKG software to be independend of the SRM Ergometer software.
    Please connect the SRM ergometer via the serial port and the USB-to-Serial Adapter to the controlling computer.
    Please note: If you like to control the protocol by an external device don’t start the performance diagnostics in the SRM ergometer software. The SRM ergometer software are dominant.
  3. Torque Analysis
  4. Ethernet Ergometer


  • Connecting the Ergometer (Ports)

  • Connecting the Ergometer (Ports)

  • Connecting the Ergometer (Ports)

Ethernet hub

An Ethernet hub is a network hardware device for connecting multiple Ethernet devices together and making them act as a single network segment. If, for example, a notebook has only 1 Ethernet port this offers a solution. Because if you want to you use both the Ergometer and the Torque Analysis you will need 2 Ethernet ports. It is most likely is does not matter which Ethernut hub you will use but we recommend to take the Dexlan Ethernet hub because is has been tested with the SRM Ergometer.

  • Front view of the Dexlan Ethernet hub

  • Top view of the Dexlan Ethernet hub

  • Connecting the Dexlan Ethernet hub

The PowerControl Ergometer

The PowerControl Ergometer is the new version of the PowerControl and can be used only with the new ergometer control. It receives and displays the HR data.

To employ the PowerControl on the Ergometer the user has to ensure that the zero-offset is correctly entered. All other values such as slope, circumference of tire, etc. are in this case not applicable and has to be changed in the settings of the ergometer software.


  • The Power Control IV, abbreviated as PC on the handlebars in the photo

  • The PowerControl Ergometer

  • The PowerControl Ergometer

  • Rear PowerControl Ergometer with one connection


Main menu

The main menu shows real-time data as the athlete trains.

Real-time Training Data Menu:
  • Top Line: Time - total training time [h:min:sec].
  • Middle Line: Power [Watt], Heartrate [bpm].
  • Bottom Line: Speed [km/h], Cadence [rpm].
If no signal from a sensor is picked up, the display shows “-“ for this data instead of a number (for example “Heartrate -“ if heartrate sensor is not paired/connected).

Sensor Pairing

You need to pair the PowerControl Ergometer with the heartrate sensors. If you don’t do this, no heartrate data will be received by the PowerControl Ergometer and can't be saved in the ergometer software.

Please follow these steps:

  • Connect the ergometer to the power supply.
  • Switch on heartrate sensor by putting the belt on your chest. Please moisten the electrodes to improve contact.
  • Switch on the PowerControl by pressing the MODE and PRO buttons simultaneously.
  • Select the heartrate sensor you like to pair: Possible heartrate sensors are SUUNTO or the PLUS (the PLUS-SRM heartrate sensor belongs to the ergometer standard accessory)
  • Press SET for searching the heartrate sensor; the search bar of the display shows the progress of the search and the antenna symbol is flashing.
  • If the heartrate sensor is found, the search bar is completed, the antenna symbol is displayed continuously and in the bottom line the sensor’s serial number is displayed.
  • Hold MODE for about 3 seconds to get back in the main display chart, the heartrate should be displayed after a short time.

If no signal is picked up, please check and repeat pairing from the beginning:

  • Damp the heartrate belt at the skin sensors to ensure that the heartrate data can be recorded by the heartrate belt.
  • If the sensor is working e.g. with another receiver (e.g. heartrate watch, PC8).
  • Check the battery of the hartrate sensor.
  • If it is still not working, please get in touch with the SRM Service Center.

Control test with PowerControl keys

You have the possibility to start and stop the test (or the training session) with the keys of the PowerControl.

Keybord Shortcuts
  • PRO (short): Test Start
  • SET (short): Test Pause
  • PRO (long): Test Resume
  • SET (long): Test Stop


The Power Supply

Power Supply

The power supply has been especially designed to suit the SRM Performance Ergometer. It supplies power to the ergometer, including the PowerControl Ergometer. The operating mode of the power supply is indicated by a blue LED display.

Place the power supply in dry, well aired condition. Avoid switching the power supply on and off in quick succession. The power supply does not need any maintenance.

Light Barrier

The light barrier measures the speed of the fly masses. It is a necessary for the power measurement. If speed is not measured correctly, the power measurement is not correct either. The speed values are displayed in the SRM ergometer software and on the PowerControl Ergometer. The speed data do not correspond to real speed values.

Adjustments

It is possible to do some adjustments to the SRM Ergometer if it is necessary.

Relocating Plug

The cable of the PowerControl could be too short with the new SRM Ergometers. This occurs by pulling up the steering wheel of the Ergometer. In order to solve this the plug of the PowerControl will be relocated.

  • Front view relocating plug PowerControl

  • Side view relocating plug PowerControl

Grounding

Not every SRM Ergometer has been grounded thoroughly for international standards. This could be fixed easily by adding some more grounding like in the images below.

  • Front view grounding

  • Side view grounding

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