Delta Electronics VFD-EL series, User Manual

Page: 63 / 181

Chapter 4 Parameters
|
| |
|
4-34 Revision 2016/03, 6ELE, V1.14
( )






+ +
× =
2
n S
2
t t t
x x
p
120
f n × =
s: distance travelled(round)
n: rotation speed(round/second)
x
t
: delay time(second)
2
t
: deceleration time (second)
n: rotation speed (round/ minute)
p: number of poles of motors
f: rotation frequency (Hz)
The value of
x
t
in the equation above is as shown below.
When the slope is negative
(t1>t2)
When the sloe is positive (t1<t2)
As shown in the image below, a 4-pole motor turntable’s diameter =r and its rotation speed = n(RPM).
r
n
Example 01
When that motor turntable is rotating at 50Hz, Pr02.02 =4 [Simple Positioning Stio; E.F.: coast to stop], Pr01.26=50
Hz[Simple Positioning Stop Frequency 6], and its corresponding Pr01.34 =2 sec [Delay Time of Simple Positioning
Stop 6] , the deceleration time will be 10 sec for decreasing from 50Hz to 0Hz.
When stop command is given, Simple Positioning Stop will be activate, its rotation speed is
n = 120x50/4
（
round/ minute
）
= 25
（
round / second
）
Number of rounds of motor turntable = (25 x (2 + 12)) / 2 = 175(rounds)