Encoder Basics
Posted: Mon Mar 15, 2010 2:56 pm
Acorn Encoders Basics
1. Encoder Type:
Centroid Acorn CNC controller Encoder input requires quadrature, differential encoders for Spindle encoder use which operate on 5VDC. This is the most common type of encoder. Encoders labeled "TTL type" (single ended, non differential) are unsuitable, and fortunately are rare and converter boxes are not recommended.
2. Encoder Signals:
a) The following signals must be present and wired: A, /A, B, /B, Z, /Z, +5VDC and ground.
Note: The Z channel is sometimes labeled as I, C or "marker". The "/" symbol may also be
expressed as "-", "NOT" or "!" or a line over the letter, it means the signal is the complement
(opposite) of the channel specified.
b) Signal levels:
The "low" signal level must be less than 0.5 VDC and the "high" signal level must be at least 3.5 VDC. ACORN supplies around 50mA that is typical of most encoders.
3. Encoder Resolution:
Typical Machine tool applications (milling machines, lathes and routers) require at least 1000 line (4000 counts per rev) encoders, We recommend any where from 1000 to 2000 line (= 4000 to 8000 counts per rev) encoders. To achieve reasonable accuracy for good threading and rigid tapping.
Encoder wiring at the Acorn
DB9 Body = Cable Shield
Pin Function
1 No Connection
2 GND
3 Z\
4 A\
5 B\
6 Z
7 A
8 B
9 +5 VDC
related Acorn Spindle Encoder thread.
https://centroidcncforum.com/viewtopic.php?f=60&t=1925
1. Encoder Type:
Centroid Acorn CNC controller Encoder input requires quadrature, differential encoders for Spindle encoder use which operate on 5VDC. This is the most common type of encoder. Encoders labeled "TTL type" (single ended, non differential) are unsuitable, and fortunately are rare and converter boxes are not recommended.
2. Encoder Signals:
a) The following signals must be present and wired: A, /A, B, /B, Z, /Z, +5VDC and ground.
Note: The Z channel is sometimes labeled as I, C or "marker". The "/" symbol may also be
expressed as "-", "NOT" or "!" or a line over the letter, it means the signal is the complement
(opposite) of the channel specified.
b) Signal levels:
The "low" signal level must be less than 0.5 VDC and the "high" signal level must be at least 3.5 VDC. ACORN supplies around 50mA that is typical of most encoders.
3. Encoder Resolution:
Typical Machine tool applications (milling machines, lathes and routers) require at least 1000 line (4000 counts per rev) encoders, We recommend any where from 1000 to 2000 line (= 4000 to 8000 counts per rev) encoders. To achieve reasonable accuracy for good threading and rigid tapping.
Encoder wiring at the Acorn
DB9 Body = Cable Shield
Pin Function
1 No Connection
2 GND
3 Z\
4 A\
5 B\
6 Z
7 A
8 B
9 +5 VDC
related Acorn Spindle Encoder thread.
https://centroidcncforum.com/viewtopic.php?f=60&t=1925