Digital Control System ELFEED KRS 47 - Erhardt+Leimer Inc.

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15 Νοε 2013 (πριν από 4 χρόνια και 7 μήνες)

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Digital Control System
The ELFEED KRS 47 tenter infeed assu-
res that the web is reliably taken up at the
tenter infeed by the clips or pins of the
transport chain. The KRS 47 version with
digital guiding is designed for relatively
slow-moving tenters and dryers with web
speeds of up to 50 m/min.
The movement is transferred to the infeed
rails by a trapezoidal screw. By selecting
an appropriate pitch, adjustment to the
tenter requirements is easy. High adjust-
ment speeds produce low adjustment
forces and vice-versa. The main share of
the force is not required for spreading the
textile web but for moving the mass of
the infeed rails.
Movement transfer by screw also permits
actuators to be mounted outside the
tenter infeed rails. In this way, these may
be installed in a protected environment
outside extremely corrosive zones, e.g. in
mercerising machines.
Two digital sensors detect the left and
right web edges independently of one
another and transmit their signals directly
to the digital guider. There, the adjust-
ment speed of the rails may be set indivi-
dually by push buttons via a setup pro-
gram. All current operating parameters,
through to error messages, may be re-
trieved on the display of the digital guider
at any time.
The left and right system operate inde-
pendently of one another.
Stenter guiders
The ELFEED KRS 47 infeed system
mainly consists of:

web spreader (x 2)

edge sensor FR 55 (x 2)

power source

controller/amplifier DC 550.

DC actuators KR 4701 with
incremental encoder (x 2)
Motor-driven edge uncurlers with 2, 3 or
4 scroll roller or, alternatively, mechanical
spreaders are predominantly used to un-
curl the web edges.
Edge sensor FR 55 with infra-red scan-
ning, combines contact-free and mecha-
nical scanning in one unit. Due to its digi-
tal resolution capability it is also suitable
for patterned or strongly contrasted
webs, very transparent and poorely re-
flective materials with a reflection degree
of at least 2%.
The controller transfers the sensor signals
to the DC actuators for positioning the in-
feed rails. Due to the self-arresting feature
on the screw, each target position is
The controller also contains the necessary
interfaces for connecting peripheral units.
A built-in mechanically/electronically
operated safety logic monitors the end
positions of the rail heads and reliably
prevents damage to the rail joints caused
when the permissible kinking angle is
Technical Data KRS 47
Edge Sensor FR 5501
Supply voltage
Nominal value 24 V DC
Permissible range 20 - 30 V DC
(including ripple)
Current input approx. 100 mA (for 24 V)
Power input approx. 2.4 W (for 24 V)
Scanning frequency 200 Hz
Measuring range ± 10 mm
Measuring range resolution 0.05 mm
Admissible ambient temperature 10 to + 65 °C
Storage temperature 0 to + 85 °C
Line length max. 25 m
Distance between edge sensor/web 36 mm
Protection class IP 65
Weight 0.8 kg
Power source / Transformer
Supply voltage 110 to 600 V AC
Rated output 680 VA
Nominal voltage 34 V AC
Output current 20 A AC
Controller / amplifier DC 550.
Supply voltage 34 V AC
Power input 550 VA
Power output (*T
< 45 °C) 2 x 225 W
Output current 2 x 8 A
Admissible ambient temperature 60 °C
Protection class
DC 55 mounted on base plate IP 20
Switch panel SE 405.IP 54
mounted in E+L cabinet
Drive KR 47 with DC 550.
Admissible ambient temperature 65 °C
Protection class IP 54
Nominal speed 160
Nominal moment 8,5 Nm
Subject to technical modifications without notice *T
= ambient temperature