ABB ACS880 N5700 Series - Example 2 - Pulley Transmission with Position Feedback from Load-Side Encoder; Example 3 - Linear Screw with Laser Distance Measurement

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Example 2 – Pulley transmission with position feedback from load-side
encoder
• Drive-side pulley diameter: 200 mm
• Load-side pulley diameter: 500 mm
• Load units:
• 1 unit = 1.000 mm / Load-side pulley
circumference range as modulo
• Position feedback: Pulley load disk
• Speed feedback: Motor encoder
ACS880
FEN-xx
FEN-xx
M
ENC
1
ENC
2
Load gear = 86.14/86.15 = Load revs/Load encoder revs = 1/1
Feed constant = 86.16/86.17 = Load units/Load revs × (500×π/1)
Modulo range = 86.18/86.19 = 1/1
Load encoder scale = 86.21/86.22 = Gear ratio = 500/200
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Example 3 – Linear screw with laser distance measurement
• Gear ratio: 5
• Screw pitch: 8 mm (load travel per one
revolution of load)
• Load units: 1 unit = 1 mm, linear
• Position feedback: 24-bit linear (laser)
encoder with a resolution of 0.1 mm
• Speed feedback: Motor encoder
ACS880
FEN-xx
FEN-xx
M
ENC1
Load gear = 86.14/86.15 = Load revs/Load encoder revs = 1/1
Feed constant = 86.16/86.17 = Load units/Load revs × (16,777,216/10)
Modulo range = 86.18/86.19 = 0/1
Load encoder scale = 86.21/86.22 = Gear ratio × Load revs/Load encoder revs = (5 ×
16,777,216)/(10 × 8)
Settings and diagnostics
Parameter groups: 74 Position status & control words (page 440), 75 Position
profile (page 450), 86.2 Actual position (page 463), 87 Master position (page 472) and
90 Feedback selection (page 484).
Position control program features 43