7.1 Setting User Constants
Servo OFF
Servo ON
Motor Speed
(r/min)
Cn-0015
DB Stop or Free-run Stop
0
Brake Release
Brake Hold
Cn-0016
7.1.5 Motion-related Constants
The following motion-related user constants are available.
■ Cn-0024 (B) and Cn-0025 (A): Electronic Gear Ratio
B (Cn-0024
• The electronic gear ratio A Cn-0025 J represents the number of encoder pulses per refer-
ence unit.
For example, consider a system where the reference unit is micrometers in equipment that
drives a ball screw with a 5-mm (0.20-in) pitch using a Servomotor with an incremental en-
coder (8192 pulses). Since 8192 encoder pulses are generated 4 times (unconditionally 4
times) in one motor revolution, the number of pulses generated is 8192 x 4 or 32768 pulses.
Here, the Servomotor moves 5 mm (0.20 in) above the 5-mm (0.20-in) pitch ball screw, and
this distance expressed as micrometers is 5000 gm. Therefore, set Cn-0024 to 32768 and
Cn-0025 to 5000.
• Make sure that the electronic gear ratio falls within the range 0.01 B/A :5 100.
• Be sure to recalculate and correct user constants set in reference and speed reference units.
Do not change this setting during motor running.
■ Cn-001F: First—step Linear Acceleration/Deceleration Constant
• Sets the first—step acceleration/deceleration when two-step acceleration/deceleration is used.
• When two-step acceleration/deceleration is not used, set the first-step acceleration/decelera-
tion speed and the acceleration/deceleration constant switching speed (Cn-0021) to 0.
• Allowable setting range: 0 to 65535 [ x 10000 reference units/s2]
■ Cn-0020: Second—step Linear Acceleration/Deceleration
Constant
• Sets the second—step acceleration/deceleration.
• Allowable setting range: 0 to 65535 [ X 10000 reference units/s2]
7 -5
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