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Related Manuals for AEMC GROUNDFLEX 6474
Summary of Contents for AEMC GROUNDFLEX 6474
- Page 1 6474 GROUNDFLEX™ ADAPTER E N G L I S H User Manual...
- Page 3 The recommended calibration interval is 12 months and begins on the date of receipt by the customer. For recalibration, please use our calibration services. Refer to our repair and calibration section at www.aemc.com. Serial #: ________________________________ Catalog #: ______________________________ Model #:...
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Page 4: Table Of Contents
Table of Contents 1. INTRODUCTION ................3 International Electrical Symbols ............4 1.2 Definition of Measurement Categories ..........4 1.3 Receiving Your Shipment ..............4 1.4 Ordering Information ................5 1.4.1 Accessories and Replacement Parts ........5 2. GROUNDFLEX ADAPTER ............... 6 ™ 2.1 Control Features ..................6 2.2 GroundFlex Sensor ................7 ™ 2.2.1 Calibration of GroundFlex Sensors ........7 ™... -
Page 5: Introduction
CHAPTER 1 INTRODUCTION WARNING These safety warnings are provided to ensure the safety of personnel. Please read and comply with these precautions: • This instrument is protected from accidental voltages of not more than 50V with respect to earth in measurement Cat. IV. The guaranteed level of protection of this equipment may be compromised if used in a manner not specified by the manufacturer. • Safety is the responsibility of the operator. • All metal objects or wires connected to the electrical system should be assumed to be lethal until tested. Grounding systems are no exception. • Never exceed the maximum rated voltage and current, and the mea- surement category. • Never exceed the protection limits, and always comply with the condi- tions and place of use, indicated in the specifications. • Do not use the instrument or its accessories if they appear damaged. • Use accessories that have overvoltage category and service voltages greater than or equal to those of the instrument (Cat. IV 50V). Use only accessories that comply with safety standards (IEC 61010-2-031 & 32). -
Page 6: International Electrical Symbols
1.1 International Electrical Symbols Signifies that the instrument is protected by double or reinforced insulation. This symbol on the instrument indicates a WARNING that the operator must refer to the user manual for instructions before operating the instrument. In this manual, the symbol preceding instructions indicates that if the instructions are not followed, bodily injury, installation/sample and/or product damage may result. -
Page 7: Ordering Information
115V US, two 500 ft color-coded leads on spools (red/blue), two 100 ft color- coded leads (hand-tied, green/black), one 30 ft lead (green), four T-shaped auxiliary ground electrodes, set of five spaded lugs, one 100 ft AEMC tape measure, DataView software, ®... -
Page 8: Groundflex Adapter
CHAPTER 2 GROUNDFLEX ADAPTER ™ 2.1 Control Features GroundFlex ™ Sensor SENSOR TURNS 50V CAT IV To Model 6472 Overload SENSITIVITY INPUT 1-2-3 1-2-3-4 GroundFlex Adapter ™ For Use with the MODEL 6474 Ground Tester Model 6472 1. Inputs 1 through 4 for four GroundFlex™ sensors 2. Connector for connection lead to the Ground Tester Model 6472 OVERLOAD indicator 4. Selector for NUMBER OF TURNS: 1, 2, 3 or 4 5. Selector for SENSITIVITY: x10, x1 or x1/10... -
Page 9: Groundflex ™ Sensor
2.2 GroundFlex Sensor ™ The GroundFlex sensors are placed around a conductor (pylon leg or pole) and ™ closed using a screw connector. This closed loop is then used to make a contact- free measurement of the current flowing in the conductor it is wrapped around. These sensors are like current measurement clamps but are able to enclose objects that are much larger. GroundFlex sensors are available in lengths of up ™ to approx 16 ft (5m) and can be placed around objects (such as pylon legs) up to in approx 5 ft diameter (1.5m). 2.2.1 Calibration of GroundFlex Sensors ™... - Page 10 Start by identifying each sensor using the identification rings (brown, red, orange, yellow) supplied with the device. • Connect the calibration loop between terminals H and E of the Model 6472. • Connect the Model 6472 and 6474 together using the connection cable. • Connect the GroundFlex sensor with the brown ring to input 1 of the Model ™ 6474, the one with the red ring to input 2, the one with the orange ring to input 3, and the one with the yellow ring to input 4. • Coil the GroundFlex sensor four times around in the calibration loop and ™ close it using its screw connector. Place the connector as far as possible from the calibration device. NOTE: • The sensors have arrows to indicate a direction. • All sensors should face the same direction. (clockwise or counter-clockwise) •...
- Page 11 Set the switch of the 6472 to SET-UP. 2. Set the SENSOR TURNS switch to 4. 3. Set the SENSITIVITY switch to x1. 4. Set the INPUT SELECTION switch to 1. SENSOR TURNS SENSITIVITY INPUT 1-2-3 1-2-3-4 5. Press the Hz/OPTIONS button 5 times. The device starts by comparing the current I injected by the device into the calibration loop to the current I measured by the GroundFlex sensor. If they ™ are different, the "CAL" symbol blinks to recommend a calibration. S x 1 AUTO NOTE: To avoid measurement errors, do not touch the GroundFlex sensor or ™...
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Page 12: Measurements In Auto Mode
7. The device calculates and stores a calibration coefficient for the GroundFlex ™ sensor connected to channel 1. S x 1 AUTO This operation must be repeated for channels 2, 3 and 4; the INPUT SELECTION switch must be set to the corresponding position each time. The calibration values are now stored into memory. NOTE: Always connect the same sensor to the same input. 2.3 Measurements in AUTO Mode 2.3.1 Preparation The GroundFlex Adapter Model 6474 is designed to be used only with the Model ™ 6472 device. The two devices must be connected using the special connection cable supplied. The Model 6474 has no ON/OFF button, and is powered only by the Model 6472, via this connection cable. -
Page 13: Making A Measurement (Resistance Of Legs)
To the Model 6472 6474 NOTE: To increase measurement sensitivity, we recommend when possible, wrapping a maximum number of turns (up to 4) around the structure. 3. Set the INPUT SELECTION switch accordingly. You can measure the current flowing through one GroundFlex sensor (1, 2, 3, or 4), or through several ™... - Page 14 5. Connect the required number of GroundFlex sensors to channels 1, 2, 3, ™ and/or 4 (the channels for which they are calibrated) and place the Ground- Flex sensors around the legs of the pylon. The orientation has no effect on ™ the measurement, but all of the GroundFlex sensors must be oriented in the ™ same direction and they must all have the same number of turns. Overhead earth wire High-voltage lines 6472 4 GroundFlex™ sensors connected with the same orientation 6474 WARNING: If the GroundFlex Adapter Model 6474 is connected to the earth...
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Page 15: Other Measurements
To display the measurement parameters, press DISPLAY several times. The device displays the following parameters: and its frequency, I , R-Act (R ), U-Act (U and its frequency, S-ES PASS S-ES and its frequency), I-Act (I and its frequency). To measure the resistances of electrodes H (Z) and S (Y), or if the resistance of the electrodes is too high, start the measurement by a long press of the START/ STOP button. will be displayed. H-E 2.3.3 Other Measurements As explained above, terminals ES (Xv) and E (X) must be connected to a metallic part of the pylon above the GroundFlex sensor in order to measure the current ™ flowing ISEL downward through the sensor, therefore to the earth to measure ground resistance of the leg. If connections ES (Xv) and E (X) are placed below the GroundFlex sensor, the latter measures the current flowing towards the top... - Page 16 An equivalent diagram of the components forming this circuit is as follows: Overhead earth wire Point of injection of the current pylon Next pylon Pylon Next pylon to the left measured to the right A measurement in sweep mode (SWEEP) of an installation like this having 10 pylons gives the following results assuming an earth resistance R of 10Ω for pylon each pylon and an inductance L of 550 µH for the link via the overhead earth wire at the tip of the pylons: Impedance of the pylons Z (ohm)
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Page 17: Specifications
CHAPTER 3 SPECIFICATIONS 3.1 Electrical Measuring Method: Voltage/Current measurement with a rectangular AC signal Short Circuit Current: > 200mA Noise Suppression: > 80 dB at frequencies differing by 20% or more from the test frequency Max. Overload: 250Vrms Max. Value for R & R : 100kΩ Measuring Time: Short push on START: approx. 7 s for first value of R 128Hz, then 3 measurements per s. Long push on START: approx. 15 s for first value of R 128Hz, then 3 measurements per s. - Page 18 For test frequencies between 41 and 5087 Hz, between 1 and 4 turns of the GroundFlex sensor, and a selection of 1 to 4 measurement channels, the ™ operating accuracies are the following: SENSITIVITY and minimum I minimal Operating accuracy for R S-ES S x 1/10 >...
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Page 19: Mechanical
3.2 Mechanical Dimensions: 10.7 x 9.76 x 5.12" (272, 248 x 130mm) Weight: 7 lbs (3.2kg) approx Case Material: ULV0 Polypropylene Terminals: 4mm recessed banana jacks Case Protection: EN 60529 - IP53 (cover closed) Drop Test: Per EN 61010-1 Vibration Test: Per EN 61557-1 3.3 Environmental Operating Temperature: 32° to 113°F (0° to 45°C); 0 to 90% RH Specified Operating Temperature : 0° to 95°F (0° to 35°C); 0 to 75% RH Storage Temperature: -40° to 158°F (-40° to 70°C); 0 to 90% RH Altitude: < 3000m (1): This range corresponds to the one defined by standard EN 61557, for which an operating error including the quantities of influence is defined. -
Page 20: Maintenance
CHAPTER 3 MAINTENANCE Maintenance Please make sure that you have read and fully understand the WARNING section on page 3. • To avoid electrical shock, do not attempt to perform any servicing unless you are qualified to do so. • To avoid electrical shock and/or damage to the instrument, do not get water or other foreign agents into the case. • Turn the instrument OFF and disconnect the unit from all circuits before opening the case. -
Page 21: Repair And Calibration
For instrument repair and calibration: You must contact our Service Center for a Customer Service Authorization Number (CSA#). This will ensure that when your instrument arrives, it will be tracked and processed promptly. Please write the CSA# on the outside of the shipping container. If the instrument is returned for calibration, we need to know if you want a standard calibration, or a calibration traceable to N.I.S.T. (Includes calibration certificate plus recorded calibration data). Ship To: Chauvin Arnoux , Inc. d.b.a. AEMC Instruments ® ® 15 Faraday Drive Dover, NH 03820 USA Phone: (800) 945-2362 (Ext. 360) (603) 749-6434 (Ext. 360) -
Page 22: Limited Warranty
® For full and detailed warranty coverage, please read the Warranty Coverage Information, which is attached to the Warranty Registration Card (if enclosed) or is available at www.aemc.com. Please keep the Warranty Coverage Information with your records. What AEMC Instruments will do: ®... - Page 24 06/08 99-MAN 100326 v1 Chauvin Arnoux , Inc. d.b.a. AEMC Instruments ® ® 15 Faraday Drive • Dover, NH 03820 USA • Phone: (603) 749-6434 • Fax: (603) 742-2346 www.aemc.com...