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Baumer_EAM580_360_CANopen_MA_EN_Rev0003.0000h_Index0004.docx Baumer Electric AG
06.08.2018 9/28 Frauenfeld, Switzerland
4.4.5 Electronic gear function
The electronic gear function divides the position value by the gear factor. Therefore it transforms the position value into
the view of the application:
π‘Žπ‘π‘π‘™π‘–π‘π‘Žπ‘‘π‘–π‘œπ‘› π‘π‘œπ‘ π‘–π‘‘π‘–π‘œπ‘› =
π‘’π‘›π‘π‘œπ‘‘π‘’π‘Ÿ π‘π‘œπ‘ π‘–π‘‘π‘–π‘œπ‘›
𝑖
The gear factor (i) is defined as followed:
𝑖 =
πΊπ‘’π‘Žπ‘Ÿπ‘‰π‘Žπ‘™π‘’π‘’1
πΊπ‘’π‘Žπ‘Ÿπ‘‰π‘Žπ‘™π‘’π‘’2
There are three objects that should be configured to use the electronic gear function.
0x2001-1 Enable
Set this object to the value β€œ2” to enable the electronic gear function, while the value β€œ1” disable it.
0x2001-2 Gear Value 1
This Object defines the numerator of the gear factor.
The range of this integer value is 1…32767.
0x2001-3 Gear Value 2
This Object defines the denominator of the gear factor.
The range of this integer value is 1…32767.
Figure 4: Example configuration of gear values
obj 2001h-3h
GearValue2
eg. 8 teeth
Example
discrete gear with number of teeth
obj 2001h-2h
GearValue1
eg. 17 teeth
Motor
Gear
gear ratio i
=
6.25
1
=
625
100
obj 2001h-2h
GearValue1
eg. 625
obj 2001h-3h
GearValue2
eg. 100
i = 6.25
Example
gear box
Encoder
Encoder
Application
Application
Limitations
A useful gear ratio is greater than 0.125, while a gear ratio smaller than 1 may result in higher signal noise.
The maximum encoder turns in unpowered operation must be smaller than 2
29
(536’870’912) turns.
The electronic gear function is useful for multiturn encoders. In case of singleturn encoders, the position value gets lost
after a power cycle.