Dillon DynaSwitch - Manual (Page 17)

17
The Dillon Cranegard Load Limit Switch is used to protect cranes and
hoists against overloading where it is impossible or inconvenient to use a
Dillon Dynaswitch. This unit can be applied to wire rope without cutting or
removing the dead end from its existing mount. It may also be used on
machinery such as elevators to provide a switch action at a given load.
The Cranegard is intended for applications with gradually applied tensions
and not dynamic or impact loads.
The Dillon Cranegard Load Limit Switch is designed to clamp directly onto
typical hoist or crane rope. It consists of two side plates. Two steel
sheaves which are equipped with precision bearings, a rope clamp and
center support which in turn is attached to a flexure. Arm(s) on the flexure
can actuate as many as four microswitches at preset load points. Adjust-
ment screws for the switches are located under a sealed cover.
The Dillon Cranegard Load Limit Switch flexure beam has a safety factor
of 2:l. Ultimate safety factor is a function of wire rope condition. In the
interest of safety, damaged or worn wire rope should be replaced.
The microswitch is type BZG1-2RN, weatherproof, Dillon P/N 17981-0048
(paragraph 1-7). As many as four switches can be installed on one
Cranegard unit.
Table 5-1, below, indicates capacities and other specifications.
Section 5 Cranegard ® Load Limit Switch
5-1
Introduction
5-2
General Description
5-3
Safety Factor
5-4
Micro-Switches
5-5
Key Specifications
Part Capacity Min. Set Repeatability Rope Diameter Inches
Number Pounds Point Lb Pounds
CGS-1 2500 100 75 3/16 1/2
CGS-2 5000 200 150 3/8 7/8
CGS-3 10000 400 300 7/16 7/8
CGS-4 20000 800 400 5/8 1 1/4
Table 5-1
Minimum Maximum