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9-2
Measuring Power Loss
Chapter Summary
Publication 1756-TD008A-EN-P - August 2002
Cable System Inspection
Inspect the cable system periodically, including testing cable loss as
described in the next section. Make sure you properly document
all tests.
You should test each cable segment before and after its installation to
verify that cable attenuation does not exceed 12dB/km. This test is
called power loss measurement and is conducted using an optical
power meter.
We recommend you use a test kit that includes a light source and a
power meter. The power source must emit light at nominal
wavelength of 640nm (red) only or you get incorrect results. Follow
the manufacturer's instructions for the power loss measurement
procedure.
The test kit example is the T701 Test Kit with the H-P HFBR-4501
adapter. Fotec Incorporated manufactures the test kit and can be
contacted by:
· phone - 800.537.8254 in the United States
· internet - http://www.fotec.com
Always record and maintain records for attenuation levels for each
cable segment. The attenuation records are valuable tools for
troubleshooting and maintaining your cable system.
Considerable power loss in your cable could be a result of:
· improper bend radius
· bending losses
· broken fibers
· poor connections
· contaminated or damaged connectors
In this chapter, you read about maintenance and troubleshooting.
Appendix A lists the Specifications for the ControlLogix SynchLink
module, ControlLogix Drive modules and PowerFlex 700s DriveLogix
drives.
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