Dillon DynaSwitch - Manual (Page 5)

5
Section 1: Dynaswitch General Information
The primary purpose of Model DS Dynaswitches ® is to protect cranes,
hoists and other lifting machinery against weight or force overload dam-
ages. They can also be used to perform control functions proportional to
weight such as shutting down a pump when a tank is filled. As many as
four standard microswitches can be installed on the Dillon Dynaswitch to
perform multiple automated functions. The Dynaswitch is intended for
applications with gradually applied loads and should not be installed where
it may encounter severe dynamic or impact loads.
Dillon Dynaswitches are designed to work with either a tension or com-
pression load. All Dynaswitches consist of a U-shaped force beam, a
microswitch (or microswitches), and attachment fittings for applying load at
mounting points. The force beam bends as force is applied and causes the
microswitches to open or close electrical circuits. Illustrations on pages 7
and 8 show various microswitches and attachment fittings. Dynaswitch
capacity should be selected based on maxiumum forces it may encounter,
including load-increasing factors such as acceleration of mass and static
arrangement of cables.
All Dynaswitch force beams and attachment fittings have a safety factor of
5:1. In addition, all models have an overload stop, set slightly in excess of
rated capacity to prevent damage to measuring capability.
When loads are applied to compression models, the force beam legs tend
to come closer together. Paragraph 2-6-A explains how to hook up safety
overload circuits and auxiliary circuits of compression models’ mi-
croswitches. Compression models contain threaded holes on the bottom
leg for mounting to machinery and a spherical bearing on the top leg to
concentrate the applied load at one point. The stops for measuring capa-
bility protection are adjustable bolts in all capacities except 25K and 50K,
where this stop is integral with the force beam.
When loads are applied to tension models, the force beam legs tend to
spread apart. Paragraph 2-6-B explains how to hook up safety overload
circuits and auxiliary circuits to tension models’ microswitches. Tension
model attachment fittings include spherical rod end connectors, shackles,
lifting eyes, non-swivel hooks and threadstuds. Attachment fittings are
mounted on opposite legs and are in-line axially so the applied load will not
cause rotation of the beam. The stops for measuring capability protection
are adjustable bolts in all capacities.
1-1
Introduction
1-2
General Description
1-3
Safety
1-4
Compression Models
1-5
Tension Models