03/12 EM-ABS-01 for ACU 37
Required data:
The following data is needed for commissioning of the linear encoder:
Gear transmission [] or input speed / output speed [rpm/rpm]
Encoder resolution [bits]
Running wheel diameter [m]
Required accuracy [m] or resolution [increments/m]
1st step: Identify gear values reference system:
The input speed (motor speed) will determine the setting for parameter
Gear Box:
Motor Shaft Revolutions
1117, the output speed will determine the setting for para-
meter
Gear Box: Driving Shaft Revolutions 1116.
The value should be entered as exactly as possible. Shifting of decimal places or mul-
tiplication with appropriate factors can increase accuracy.
Example:
Input speed: 1401 rpm
Output speed: 77.3 rpm i = 18.12
Encoder resolution: 24 Bit
Diameter: 160 mm = 0.16 m
Required accuracy: 0.01 mm = 0.00001 m
Î
Gear Box: Motor Shaft Revolutions 1117 = 14010
Î
Gear Box: Driving Shaft Revolutions 1116 = 773
2nd step: Identify feed constant reference system:
The feed constant is calculated by multiplying the diameter and π by the resolution.
The resolution is the reciprocal of the accuracy.
⎥
⎦
⎤
⎢
⎣
⎡
=
m
u
Resolution
1
[m]Accuracy
[]
⎥
⎦
⎤
⎢
⎣
⎡
⋅⋅
=
⋅
=
m
constant Feed
u
Resolution [m]Diameter
u
]
u
m
[Accuracy
[m]Diameter
π
π
1115
Example:
Diameter: 0.16 m = 160 mm
Required resolution: 0.00001 m = 0.01 mm
Î
Feed constant 1115 = 50265 rev
3rd step: Calculate auxiliary quantity reference system
In the following step, the ratio of the
Feed constant 1115 to Gear Box: Driving Shaf
evolutions 1116 and Gear Box: Motor Shaft Revolutions 1117 is used in the calcu-
lations frequently. For better clarity, auxiliary quantity “R” (=reference system) is
calculated now:
]
1117
11161115
:
:
U
u
R
volutionsReMotorShaftearBoxG
volutionsReftDrivingShaearBoxG
constant Feed ⋅
=
Example:
eed constant 1115 = 50265 rev
Gear Box: Driving Shaft Revolutions 1116 = 773
Gear Box: Motor Shaft Revolutions 1117 = 14010
Î R = 2773.365 rev
= 50265 x 773 / 14010 rev
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