Editing Analog setpoint
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− | + | Analog reference is one of [[Reference signal|reference signal]] types used in motion control. | |
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− | The most typical | + | The most typical reference voltage range is +/-10V where |
− | * -10V equals the most negative | + | * -10V equals the most negative reference (-100%) |
− | * 0V equals zero | + | * 0V equals zero reference |
− | * 10V equals most positive | + | * 10V equals most positive reference (+100%) |
* Any value between is interpolated linearly | * Any value between is interpolated linearly | ||
− | Another common voltage range is 0..5V where zero | + | Another common voltage range is 0..5V where zero reference may be at 2.5 VDC (bias voltage). |
==Differential signaling== | ==Differential signaling== | ||
− | Analog | + | Analog reference input in target device is typically differential. Differential input requires 3 wires from source device: |
* Positive input | * Positive input | ||
* Negative input | * Negative input | ||
* Ground | * Ground | ||
− | The actual | + | The actual reference value will be calculated from the differential of positive and negative inputs. This eliminates error from ground currents and also reduces sensitivity to EMI noise. |
− | + | ||
[http://en.wikipedia.org/wiki/Differential_signaling Differential signaling on wikipedia] | [http://en.wikipedia.org/wiki/Differential_signaling Differential signaling on wikipedia] | ||
==Example== | ==Example== | ||
− | Lets assume +/-10V is used as torque | + | Lets assume +/-10V is used as torque reference in VSD drive. In this case 0V equals no torque, and 10V equals 100% of peak torque configured in the drive, 5V equals 50% torque etc. |
− | Peak torque can be configured to drive with [[GDtool]] as peak current limit. Torque and current are directly proportional, so torque | + | Peak torque can be configured to drive with [[GDtool]] as peak current limit. Torque and current are directly proportional, so torque reference is also a current reference. |
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