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Unsupported applications for short travels

What does "unsupported length" mean?

If the energy chain's upper run operates without touching the lower run over the entire travel, the application is considered unsupported. The unsupported length FL_G is the distance between the moving end and the beginning of the energy chain's radius curve, along which the energy supply's upper run exhibits negligible sag. This ensures the longest service life for the energy chain. The unsupported application is the most frequently used energy chain application.

The unsupported length (FL)_G installation type always ensures the longest service life and can be operated with the maximum speed and acceleration values.

10 tips for a durable energy supply in the application category "unsupported"

You are interested in an energy chain to guide cables and hoses in machines and plants safely and in an economic way? Here you can find 10 tips on making the most of your investment.

From the contents:

With minimum length to maximum travel
Acceleration, travel speed and cycle frequency
Clearance space within the energy chain
Accessories

Download 10 tips now free of charge. We would be happy to assist you at any time.

Download tips now

The unsupported length has three distinct stages:

1

Unsupported length - straight FL_G:
The energy chain either has a camber or is straight.

2

Unsupported length - with sag FL_B:
The energy chain has a sag of more than half an e-chain height.

3

Critical sag:
The sag is greater than the permissible value for FL_B. Installation with critical sag must be avoided.

Use the load diagram to check the standard values for unsupported lengths

The values in the load diagram are essential for finding a suitable energy chain for your fill weight and travel and determining the maximum load for the selected energy chain.

The black area on the load diagram indicates the unsupported length (FL_G) in which the energy chain exhibits no sag. If the travel or cable weight increases, the energy chain begins to sag (FL_B, the light grey area).

	Y Axis	X Axis	S
	Fill weight [kg/m]	Unsupported length [m]	Travel [m]
Reference Example A:	1.5kg/m	2.0m	4.0m

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The load diagram can be found on the relevant product page.

Preferred series for unsupported applications

What to do if the unsupported length is insufficient?

If your application (fill weight and travel) fall outside the unsupported length range for the desired energy chain, you have the following options:

Choose a stronger energy chain
Support the energy chain in the unsupported area. This option means restrictions for acceleration, speed and noise as a consequence. Three fundamental examples are detailed to below. Please consult igus® if you are considering this possibility. We will gladly provide you with a detailed proposal
Use a multiband e-chain or nest two energy chains inside one another. (Please consult igus®)
Design the travel distance as a gliding application

Supports in the unsupported area (FL_G and FL_B)

A: The overall unsupported straight travel can be extended to a maximum of 50% of FL_G.

B: The overall unsupported straight travel can be extended to a maximum of 100% of FL_G.

C: The overall unsupported straight travel can be extended to a maximum of 100% of FL_B .

The influence of speed and acceleration on service life

For unsupported applications, the acceleration (a) is the more critical parameter than the speed (v). High acceleration can cause the energy chain to vibrate, reducing its service life. This is especially serious if the energy chain already has a sag greater than FL_G. Maximum values for acceleration (a), speed (v), and service life are achieved only with energy chains incorporating the FL_G unsupported straight.
But then igus® e-chain systems® can sustain very high loads. To date, a peak acceleration of 784 m/s2 has been achieved during continuous use.

Standard maxium speed and acceleration values (unsupported)