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Fiber Optic Cable Installation and Handling
Instructions
Introduction
Fiber optic cables can be easily damaged if they are improperly handled or
installed. It is imperative that certain procedures be followed in the handling
of these cables to avoid damage and/or limiting their usefulness. The
information contained in this manual should serve as a guide to proper
handling, installing, testing, and for troubleshooting problems with fiber
optic cables.
For:
Plastic Fiber Optic Cable Attenuation Limits
SERCOS Attenuation Limits
System Field Testing Overview
Configuring Light Source
Physical Test Mode for Connections
Fiber Optic Cable Specifications
Rockwell Automation Support
Publication 2090-IN010C-EN-P - April 2005
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BackCover
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Summary of Contents for Allen-Bradley 2090-SCVG50-0
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Page 1: Table Of Contents
Fiber Optic Cable Installation and Handling Instructions Introduction Fiber optic cables can be easily damaged if they are improperly handled or installed. It is imperative that certain procedures be followed in the handling of these cables to avoid damage and/or limiting their usefulness. The information contained in this manual should serve as a guide to proper handling, installing, testing, and for troubleshooting problems with fiber optic cables. -
Page 2: Overview
Fiber Optic Cable Installation and Handling Instructions Overview Optical fibers require special care during installation to ensure reliable operation. Installation guidelines regarding minimum bend radius, tensile loads, twisting, squeezing, or pinching of cable must be followed. Cable connectors should be protected from contamination and scratching at all times. -
Page 3: Fiber Optic Cable Pulling Techniques
Fiber Optic Cable Installation and Handling Instructions Fiber Optic Cable Pulling Techniques Installation methods for both wire cables and optical fiber cables are similar. Just remember these rules: • Never pull on the connector. The connector/cable interface is not designed for pulling. •... - Page 4 Fiber Optic Cable Installation and Handling Instructions • For a 40m or longer pull. If you are installing cable of lengths 40m or longer, use a “figure 8" on the ground to prevent twisting. The figure 8 puts a half twist in on one side of the 8 and takes it out on the other, preventing twists.
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Page 5: Routing Fiber Optic Cables
Fiber Optic Cable Installation and Handling Instructions Routing Fiber Optic Cables Take care to properly route cables through cabinets and right angle raceways. • Install cables in raceways without loops. Avoid placing fiber optic cables in raceways and conduits with copper cables to avoid excessive loading or twisting. -
Page 6: Installation Checklist
Fiber Optic Cable Installation and Handling Instructions • Use proper cable pulling techniques when routing cables. See the section Fiber Optic Cable Pulling Techniques earlier in this manual. • Attach cables with plastic clamps having large surface areas. Avoid pinching or squeezing cable. Cable clamps should be installed manually with gentle pressure. -
Page 7: Cleaning Techniques For Fiber Optic Cables
Fiber Optic Cable Installation and Handling Instructions Cleaning Techniques for Fiber Optic Cables Proper cleaning of the fiber optic cable ends and transceivers is essential to minimize system attenuation. Dirty fiber optic cables cross contaminate their mating transceivers. Conversely a dirty transceiver contaminates its mating fiber optic cable. -
Page 8: Fiber Optic Cable Attenuation Measurements
Fiber Optic Cable Installation and Handling Instructions Fiber Optic Cable Attenuation Measurements 1. Inspect and clean the ends of the reference cable. 2. Securely connect appropriate reference cable corresponding to the type of cable to be tested. • POF reference cable used for testing POF cable •... - Page 9 Fiber Optic Cable Installation and Handling Instructions 3. Verify that optometer is set to measure appropriate wavelength and attenuation in dB. Test Cable Optometer measuring LED Light Source loss in dB 650nM nominal Figure 8 Attenuation Measurement 4. Securely connect test cable between source and optometer. 5.
- Page 10 Fiber Optic Cable Installation and Handling Instructions 6. Verify that optometer is set to measure appropriate wavelength and attenuation in dB. 7. Use the dB value on the optometer to verify that the cable under test is within specification listed in the table for that specific catalog number.
- Page 11 HCS Cable Attenuation = ((15 - 4*log(Lkm))* Lkm) + 1.5dB + 0.5dB Catalog Number Length meters, Maximum Maximum (inches) Attenuation Attenuation (dB) With Bulkhead Conn. 2090-SCVG50-0 50, (1968) 3.01 NOT ALLOWED 2090-SCVG100-0 100, (3936) 3.90 NOT ALLOWED 2090-SCVG150-0 150, (5904) 3.90...
- Page 12 Fiber Optic Cable Installation and Handling Instructions Plastic Fiber Optic Cable Attenuation Limits Plastic Fiber (POF) Attenuation Calculations: POF Attenuation = Cable Loss + Connector Loss + Finishing Tolerance POF Attenuation = (0.19dB/m * Length) + 1.5dB + 0.5dB Catalog Number Length meters, Maximum Maximum...
- Page 13 Fiber Optic Cable Installation and Handling Instructions Catalog Number Length meters, Maximum Maximum (inches) Attenuation Attenuation (dB) With Bulkhead Conn. 2090-SCNP0-1 0.1, (4) 2.02 5.02 2090-SCNP0-3 0.3, (12) 2.06 5.06 2090-SCNP0-9 0.9, (35) 2.17 5.17 2090-SCNP1-0 1, (39) 2.19 5.19 2090-SCNP3-0 3, (118) 2.57...
- Page 14 Fiber Optic Cable Installation and Handling Instructions Catalog Number Length meters, Maximum Maximum (inches) Attenuation Attenuation (dB) With Bulkhead Conn. 2090-SCVP0-1 0.1, (4) 2.02 5.02 2090-SCVP0-3 0.3, (12) 2.06 5.06 2090-SCVP0-9 0.9, (35) 2.17 5.17 2090-SCVP1-0 1, (39) 2.19 5.19 2090-SCVP3-0 3, (118) 2.57...
- Page 15 Fiber Optic Cable Installation and Handling Instructions SERCOS Attenuation Limits The SERCOS standard defines different allowable attenuation losses for both Plastic and Hard Clad Silica fiber optic cables. The differences for the two types of fiber are due to the drive characteristics of the transmitters into the different diameters of POF and HCS cables.
- Page 16 Fiber Optic Cable Installation and Handling Instructions System Field Testing Overview The total point to point attenuation should never exceed 12.5dB for POF and 4dB for HCS cables. Field testing cables as installed is accomplished in much the same manner as tests described in section 1. Field-testing requires verification of transmitter light power output and receiver input power.
- Page 17 Fiber Optic Cable Installation and Handling Instructions System Field Testing Verify Receiver Power Verify receiver power as outlined below: SERCOS SERCOS Drive or Drive or Module Module Receiver Transmit Cable under Test as installed Optometer Set to measure power in dBm Figure 11 Field Testing Receiver Power 1.
- Page 18 Fiber Optic Cable Installation and Handling Instructions Configuring Light Source Configure test module as test light source 1. Plug module into ControlLogix rack 2. Set desired light power. Switch up for hi power output. Switch down for low power output. Configure Ultra3000 drive as test light source 1.
- Page 19 Fiber Optic Cable Installation and Handling Instructions Physical Test Mode for Connections Purpose The Physical Test Mode lets you to test and diagnose the condition of the fiber optical connections to the SERCOS interface™ module. Description SERCOS is a real-time optical serial interface between the control unit and its associated drives to transmit periodic and non-periodic data.
- Page 20 Fiber Optic Cable Installation and Handling Instructions The table below offers an explanation of the SERCOS ring indicator. If the SERCOS ring The module status is: indicator displays: Solid orange light Continuous light is active. Flashing orange light Zero bit stream is active. The table below offers an explanation of the CP indicator.
- Page 21 Fiber Optic Cable Installation and Handling Instructions To perform the test you must add an MSG instruction to your ladder logic. The MSG instruction is accessible from the Input/Output selection. Figure 13 MSG Instruction from Input/Output Tab Click on the MSG button to insert the instruction on the desired rung. Figure 14 MSG Instruction Faceplate Right mouse click on the Message Control operand field and select New Tag.
- Page 22 Fiber Optic Cable Installation and Handling Instructions Message Instruction Settings The Message Configuration Screen has three tabs: Configuration, Communication and Tag. This is where you set the values for the test. Figure 15 Message Configuration Tab Enter the following values for the fields on the Configuration Tab screen. Message Type: CIP generic Service Type: Custom Service Code: 51 hex.
- Page 23 Fiber Optic Cable Installation and Handling Instructions 0 = Set Continuous Light 1 = Set Zero Bit Stream 2 = Set High transmission power level 3 = Set Low transmission power level Source Length: must be set to 2 bytes. Destination Field: The resp_string must be set to a INT array of 1.
- Page 24 Fiber Optic Cable Installation and Handling Instructions Message Instruction Tag Tab Click on the Tag Tab to access the Message Instruction Tag screen. Figure 17 Message Tag Screen Accept the CIP message instruction defaults. The following example sets the Continuous Light test mode for attenuation testing.
- Page 25 Number meters, Bend Tensile (times) (inches) Radius Load No Load Newtons mm (in.) (Lbs.) 2090-SCVG50-0 50, (1970) 30 (1.2) <98 (22) 490 N/5 cm Avoid* 2090-SCVG100-0 100, (3937) 30 (1.2) <98 (22) 490 N/5 cm Avoid* 2090-SCVG150-0 150, (5905) 30 (1.2) <98 (22)
- Page 26 Fiber Optic Cable Installation and Handling Instructions Catalog Length Long Term Maximum Impact Twist Number meters, Bend Tensile (times) (inches) Radius Load No Load Newtons mm (in.) (Lbs.) 2090-SCEP32-0 32, (1260) 25.4 (1.0) < 70 (15) 0.4 N·m 2090-SCNP0-1 0.1, (4) 25.4 (1.0) <...
- Page 27 Fiber Optic Cable Installation and Handling Instructions Catalog Length Long Term Maximum Impact Twist Number meters, Bend Tensile (times) (inches) Radius Load No Load Newtons mm (in.) (Lbs.) 2090-SCVP20-0 20, (787) 40.0 (1.6) < 245 (55) 0.4 N·m 2090-SCVP25-0 25, (984) 40.0 (1.6) <...
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