YASKAWA SGM Series User Manual page 124

Motor Speed
(r/min)
Cn-0015
0
7.1.5 Motion-related Constants
The following motion-related user constants are available.
J Cn-0024 (B) and Cn-0025 (A): Electronic Gear Ratio
D The electronic gear ratio A
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 ¢ 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 µm. Therefore, set Cn−0024 to 32768 and
Cn−0025 to 5000.
D Make sure that the electronic gear ratio falls within the range 0.01 ≦ B/A ≦ 100.
D Be sure to recalculate and correct user constants set in reference and speed reference units.
Do not change this setting during motor running.
J Cn-001F: First−step Linear Acceleration/Deceleration Constant
D Sets the first−step acceleration/deceleration when two-step acceleration/deceleration is used.
D 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.
D Allowable setting range: 0 to 65535 [¢ 10000 reference units/s
J Cn-0020: Second−step Linear Acceleration/Deceleration
Constant
D Sets the second−step acceleration/deceleration.
D Allowable setting range: 0 to 65535 [¢ 10000 reference units/s
Servo OFF
Servo ON
DB Stop or Free-run Stop
Brake Release
Cn-0016
B Cn-0024
Cn-0025
7 -5
7.1 Setting User Constants
t
Brake Hold
represents the number of encoder pulses per refer-
2
]
2
]
7