34##.-0)*'")<
Section 6-5
$),
6-5
Speed Control
Covered configuration items in this example:
•
Circular Counter
•
Rate Ranges, setting Rate Range Data
Application Description
In this example logs are fed into a saw blade. A conveyor that has two speeds
(fast/slow) transports the logs. Via the control panel the conveyor and the saw
blade can be started and stopped. A speed sensor detects the speed of the saw
blade. The pulses of the speed sensor are counted by Counter 1 and are propor-
tional to the speed of the saw blade.
Logs are fed into the saw blade at fast speed. When the saw blade encounters an
irregularity in the log, the speed of the saw blade slows down. Now the conveyor
is switched from fast to slow speed (slow speed indicator turns ON). Once the saw
blade clears the irregularity and returns to its normal speed, the conveyor is
switched from slow to fast speed again (slow speed indicator turns OFF).
The speed sensor is connected to Circular Counter 1. The two Rate Ranges
(Range 0 and 1) of Counter 1 are used to detect the speed of the saw blade. Turn-
ing the conveyor motor and the saw blade ON/OFF, using the control panel, is con-
trolled via the PLC ladder program and a Digital Input- and Output Unit (e.g.
MD292). The speed of the conveyor motor is controlled by Digital Output O0 and
the slow speed indicator is controlled by Digital Output O1 of the High-speed
Counter Unit.
Motor
Speed Sensor
Motor Fast (=0) / Slow ( =1)
Motor ON (=1) / OFF (=0)
Slow Speed
Indicator
Start Conveyor Motor + Saw Blade
Stop Conveyor Motor + Saw Blade
Control Panel
CT041
No.
X1 0
1
MA C H
X10
0
RUN
CH1
CH2
CH3
CH4
ERC
ERH
A
A
A
A
B
B
B
B
Z
Z
Z
Z
I0
I1
I2
I3
O0
O1
O2
O3
PS20 4S
Po w e r
AB
AB
CN 1
CN 2
CN 1
CN 2
BA
A
B
OUT
IN
MD292
0
8
ERR
1
9
2
10
3
11
5
13
7
15
4
12
6
14
0
8
1
9
2
10
3
11
5
13
7
15
4
12
6
14
W902-E2-03.book Seite 169 Donnerstag, 7. Oktober 2004 2:06 14
Summary of Contents for CS1W-CT021
Page 1: ...OPERATION MANUAL High speed Counter Units CS1W CT021 CS1W CT041 Cat No W902 E2 03...
Page 3: ...W902 E2 03 book Seite iv Donnerstag 7 Oktober 2004 2 06 14...
Page 5: ...W902 E2 03 book Seite vi Donnerstag 7 Oktober 2004 2 06 14...
Page 39: ...W902 E2 03 book Seite 24 Donnerstag 7 Oktober 2004 2 06 14...
Page 59: ...A 2 Section 2 3 W902 E2 03 book Seite 44 Donnerstag 7 Oktober 2004 2 06 14...
Page 155: ...4 Section 4 6 W902 E2 03 book Seite 140 Donnerstag 7 Oktober 2004 2 06 14...
Page 199: ...G W902 E2 03 book Seite 184 Donnerstag 7 Oktober 2004 2 06 14...