Foro bicicletas eléctricas, Kits eléctricos y baterías


No estás conectado. Conéctate o registrate

Foro bicicletas eléctricas, Kits eléctricos y baterías » Controlador, accesorios, manetas con corte, acelerador... » Cycle Analyst : Medir el valor del shunt del controlador

Cycle Analyst : Medir el valor del shunt del controlador

Ver el tema anterior Ver el tema siguiente Ir abajo  Mensaje [Página 1 de 1.]

jimwebo

avatar
Buenos días,sigo enredando con el tema del cycleanalyst,y tengo una duda:
Para meter el valor del shunt del controlador,he medido el mismo con el polimetro (pues no trae el valor escrito en la etiqueta) y colocando el polimetro en ohmios en la escala de 200 me da un valor de 3.0.
Ahora bien,y suponiendo que la medición es correcta. que valor tengo que poner en el cycle?
Porque me parece que hay que pasar a mohm y ahí me pierdo.
PD:
Os parece un valor descabellado el que me da?
Un saludo y gracias a todos.

jimwebo

avatar
Vamos señores,que aquí hay mucha "sabidurida";-)

Sebibike

avatar
A ver si cambiando el titulo... Wink

jimwebo

avatar
A ver...
Gracias Sebi.

meao

avatar
La escala de 200 a que se refiere?, ohmios, miliohmios?. Hace falta saber este dato del polimetro para interpretar ese valor de "3" que te da.
Segun fabricante los valores son distintos, los mas habituales son de 200miliohmios por cada "barrita".
Saludos, Carlos.

meao

avatar
Te coloco por aqui info del manual que se ha hecho en ES acerca del CA v3. A ver si te sirve, lo pongo sin traducir, por si te apañas, si no, pues lo vamos traduciendo en funcion de las herramientas de las que dispongas para hacer la calibracion.

Se puede descargar de este enlace:

http://endless-sphere.com/forums/download/file.php?id=134219

Appendix A.

A.1 Calibrating the Cycle Analyst RShunt Value
The Calibration Correction Factor
The Cycle Analyst can use either the internal controller shunt or an external shunt of known value, such as the CA-SA
external molded shunt or a larger high-current external shunt. While the external shunts are typically precision units,
the exact resistance of controller shunts can vary from controller to controller even from the same manufacturer and
batch. Typically:
• 6 mosfet Infineon controllers are between 5-6 mOhm,
• 12 mosfet controllers are between 2.5-3.5 mOhm.
• Crystalyte controllers can range from 1.1 mOhm to about 2.6 mOhm.
• eZee controllers are between 1.3 - 1.6 mOhm.
• Controllers with custom modified shunts have unknown values and must be calibrated.
There are several means to calibrate the CA RShunt setting. Ideally, a precision reference is used and the Cycle
Analyst readings are compared with those of a precision Amp or Amp-hour meter. A correction factor is calculated and
applied to the nominal CA RShunt value to arrive at a corrected setting. For instance:
• If the Cycle Analyst reads 27 Amps and the current reference shows 19 Amps,
• then the correction factor = 27A/19A = 1.421.
• If the nominal RShunt value is 1.000 mOhm,
• then the corrected value would be 1.000 mOhm x 1.421 = 1.421 mOhm.
Of course, the CA RShunt calibration will be no more accurate than the accuracy of the test equipment.

A.2 Calibration Without Instruments
In the absence of an Amp or Amp-hour meter, a serviceable calibration can be obtained based on the claimed current
limit of the controller. Examine the continuous amperage draw (second CA screen) while riding at low speed at full
throttle i.e. up an incline. If the CA reads 53 amps and the motor controller is limited to 20 amps, then a fair estimate
for the correction factor is 53A/20A = 2.65.
This calibration will not be of greater accuracy than a claimed shunt value that comes with the controller, since the
claimed resistance is the value used by the controller limiting. It will, however, give a reasonable shunt resistance
value if the shunt is user-modified. Apply this correction factor to RShunt as shown above.

A.3 Instrumented Calibration Using an Ah/Wh Meter
This procedure uses a Watts Up or similar Amp-hour/Watt-hour meter for calibration. Perform the calibration with a
fully charged battery.
1. Wire the meter between the battery and controller taking care to exclude all other current drains (lights, etc)
 from the current path through the meter.
2. Perform a Trip Reset on the Cycle Analyst
3. Ride the bike. The more AH consumed, then more accurate will be the calibration.
4. Compare the meter AH or WH with the corresponding reading from the CA and compute a correction factor as
 described above in section A.1 – either:
• (meter AH)/(Cycle Analyst AH) or
• (meter Wh)/(Cycle Analyst Wh)
5. As in section A.1 apply the correction factor to the nominal RShunt setting to determine the corrected value.
6. Verify the calibration by repeating this procedure and make a second adjustment if necessary.

A.4 Instrumented Calibration Using a Current Controlled Charger/Power Supply
This technique utilizes an iCharger in Constant Current (foam cutting) mode. The same technique can be used with a
common constant current bench power supply.
1. Plug the CA into the controller DP connector.
2. Attach a power supply or battery to the controller.
 Any voltage within the controller and CA specifications is adequate.
3. Set the iCharger to Foam Cutting mode with a constant current of 20A.
4. Attach the iCharger (-) output Vbatt(-).
5. Attach the iCharger (+) output to one of the controller motor phase leads.
6. Power up the controller and CA.
7. Power up the iCharger to drive the configured constant current through the controller shunt.
8. Read the CA displayed current (second screen).
9. Power down the iCharger.
10. Determine the correction factor and revised RShunt setting as described in section A.1 using the
Cycle Analyst reading and the iCharger actual current.
11. Verify the calibration by repeating steps 7-9; make a second adjustment if necessary.

Saludos, Carlos.

jimwebo

avatar
Gracias Carlos. 
Finalmente y tras mucho leer,le puse 1,333 mohm. 
Después le coloqué un amperimetro fiable en serie con el cycleanalist. 
Y cuál  fue mi sorpresa,que sólo había una diferencia de 0,10ah.
Ajusté el shunt a 1,340 mohm y ahora va clavado. 
Un saludo y gracias.

meao

avatar
Perfecto, asi es como pone en el Apendice 3.

Saludos, Carlos.

Sr.Agaporni


Perdonad que rescate este mensahe pero quiero calibrar un controlador y no encuentro como era el metodo del icharger y los 10V. Podeis recordarmelo?

jimwebo

avatar

Sr.Agaporni


Asias!

jimwebo

avatar
A mandar.

Ver el tema anterior Ver el tema siguiente Volver arriba  Mensaje [Página 1 de 1.]

Permisos de este foro:
No puedes responder a temas en este foro.