Chapter 12 Description of Parameter SettingsME300
12.1-12-7
n: rotation speed (revolution/second) p: number of poles of motors
x
t : delay time (second)
f: rotation frequency (Hz)
2
t : deceleration time (second)
The value of
x
t in the equation above is as shown below:
1.1 When the slope is negative (t1>t2) 1.2 When the sloe is positive (t1<t2)
As shown in the image below, a four-pole motor turntable’s diameter = r and its rotation speed =
n (RPM).
r
n
Example 01:
When the motor turntable is rotating at 50 Hz, Pr.00-22 =2 (motor stops by simple positioning),
Pr.12-26=50 Hz (Simple Positioning Stop Frequency 6), and its corresponding Pr.12-34 =2
seconds (Delay Time of Simple Positioning Stop 6) , the deceleration time is 10 seconds for
decreasing from 50 Hz to 0 Hz.
When STOP command is given, Simple Positioning Stop is activated, its rotation speed is
n = 120 x 50 / 4 (revolution / minute) = 25 (revolution / second).
Number of revolutions of motor turntable = (25 x (2 + 12)) / 2 = 175 (revolutions)
Therefore, the distance travelled by the motor after the STOP command is given = number of
revolutions x circumference = 175x 2 π r. It means the turntable returns to the top after 175
revolutions.
Example 02:
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