Siemens LOGO! 230 RC User Manual

101
LOGO! manual
EWA 4NEB 712 6006-02
5.7 Dereeler
A metal strip (coil) is fed to a punching device over a dereeler.
5.7.1 Demands on a dereeler
The following demands are placed on a dereeler:
S The metal strip must not sag.
S The metal fed to the punching device must not exceed a defined maxi-
mum tension.
S If the metal strip becomes too taut, the punching device must be
switched off.
M
~
Punching device
Metal strip
Switch S3
Strip too taut
" Punching device off
Switch S4
Strip taut
" Dereeler on
Switch S5
Strip loose
" Dereeler off
5.7.2 Previous solution
K1
Dereeler
drive
K2
K4
K3
S2 S3
K2
K2 K3
S4
K2
punching
device
H1
K1
S1
K4
S5
Enable
Automatic Strip taut Strip loose
The key-operated switch S1 is the operating mode switch (manual/auto-
matic) for the dereeler. You can use switch S2 to control the motor of the
dereeler manually. Switches S4 and S5 monitor the tension of the strip and
switch the motor of the dereeler on and off. Switch S3 switches the punch-
ing device off when the strip is too taut.
Applications

Siemens LOGO! 230 RC Specifications

General

Inputs	8 digital inputs
Outputs	4 relay outputs
Input voltage type	AC
Width	72 mm
Height	90 mm
Depth	55 mm
Number of analog inputs	0
Number of analog outputs	0
Operating temperature	0 °C to 55 °C
Storage temperature	-40 °C to 70 °C
Protection class	IP20
Digital inputs according to EN 61131-2	Type 1
Weight	approx. 210 g
Program Memory	400 function blocks
Dimensions	72 mm x 90 mm x 55 mm