Chapter 12 Description of Parameter Settings
ME300
As shown in the image below, a four-pole motor turntable’s diameter = r and its rotation speed =
n (RPM).
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:
If the turntable rotates at 1.5 Hz, Pr.12-22 = 10 Hz (Simple Positioning Stop Frequency 2), Pr.12-
21 = 0 Hz, and Pr.12-30 =10 seconds (Delay Time of Simple Positioning Stop 2), then the
deceleration time is 40 seconds for decreasing from 60 Hz to 0 Hz.
The delay time to stop of 1.5 Hz is 1.5 seconds, the deceleration time is 1 second for decreasing
from 1.5 Hz to 0 Hz.
When STOP command is given, Simple Positioning Stop is activated, its rotation speed is
n = 120 x 1.5 / 4 (revolution / minute) = 1.5 / 2 (revolution / second).
Number of revolutions of motor turntable = (1.5/2 x (1.5 + 2.5)) / 2 = 1.5 (revolutions)
Therefore, the distance travelled by the motor after the STOP command is given = number of
revolutions x circumference = 1.5x 2 π r. It means the turntable stopped after 1.5 revolutions.
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