Application:
Kiepe Pull Rope Switches PRS provide a system to isolate the
power to conveyor systems and other process equipment in
event of an emergency. Constructed from reinforced glass-fibre
and stainless steel the new PRS, being resistant to ammonia can
successfully operate in extreme and harsh environments such as
salt mines, composting, recycling plants as well as harbour areas.
Kiepe Pull Rope Switches and accessories meet the requirements
of safety authorities with respect to personnel safety and
equipment.
Operation:
Kiepe Pull Rope Switches are actuated by a plastic coated
steel wire rope placed along-side the conveyor. Pulling on the
rope at any point will trip and automatically lock the switches,
de-energizing the conveyor starter contactor. Each switch is
bi-directional in operation and has two ropes fitted to it from
opposite directions terminating with a spring at the anchor
points.
The springs will operate the switch in the event of rope breakage.
The length of rope in either direction may be up to 50 meters.
After tripping, the mechanical latch can be released only on the
switch itself.
Bus Terminal:
In the pull rope switch PRS 201 a Dupline field and installation
bus node has been integrated in addition to the emergency cutout
function. It enables the direct locating of a triggered pull rope
switch within the total system of a conveying system.
The Dupline bus is a pure information bus and not a safety bus!
Switching off a conveyor must be realized by disconnecting the
safety circuit (i.e. via positive making switching elements).
By using the time multiplex process up to 128 independent
signals can be transmitted via merely two wires of the Dupline
bus towards any direction over several kilometres. An additional
supply voltage is not necessary. By means of a manual coder an
address will be applied to each pull rope switch.
The channel generator continuously transmits the digital pulse
code (the Dupline carrier signal) to the Dupline network. It synchronises
the system via the clock pulse and time control of all
bus participants connected to the system.
It enables the Connection to all important upper-level control
systems, e.g. Profibus-DP, Device Net and others.
The Dupline system offers an economic solution to locate
actuated pull rope switches within large conveying systems.
Connecting Diagram:
Installation:
The switches are easily installed along the edge of the conveyor
structure. The actuating lever should be positioned adjacent to
the belt edge with the reset lever on the outside. Flexible vinyl
coated steel wire is available for the pull rope. One egg formed
clamp is used for each rope fastening point.
For guiding and rope support eye bolts are used at intervals up to
4 m. Stainless steel springs at the end of the rope ensure operation
of the switch in the event of rope breakage (Fail safe).
The spring pretension is adjusted by means of turnbuckles which
can simply be attached onto the actuating lever. Since the switches
are bi-directional in operation, variations of temperature which
can influence the rope length become balanced by means of the
two springs.
Drawing Installation:
Technical Data:
Accessories:
Dimensions:
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