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Summary of Contents for AEMC 2620
- Page 1 2620 GROUND FAULT/LEAKAGE DETECTOR with the Artifical Neutral AN-1 ® E N G L I S H User Manual CHAUVIN ARNOUX GROUP...
- Page 2 The recommended calibration interval for this instrument 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 #: 2125.52 Model #:...
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Page 3: Table Of Contents
Table of Contents 1. INTRODUCTION ................3 1.1 International Electrical Symbols ..........3 1.2 Definition of Measurement Categories ........4 1.3 Receiving Your Shipment ............4 1.4 Ordering Information ..............4 1.4.1 Accessories and Replacement Parts ......4 2. PRODUCT FEATURES ..............5 2.1 Description ................5 2.2 Connections ................6 3. SPECIFICATIONS................7 3.1 Reference Conditions ...............7 3.2 Electrical ...................7 3.3 Mechanical ................8 3.4 Environmental ................9... - Page 4 5.2 Specifications ................19 5.2.1 Electrical ..............19 5.2.2 Mechanical ..............19 5.2.3 Safety ................19 5.3 Principle of Operation .............20 5.4 Testing Ungrounded Systems ..........21 6. MAINTENANCE ................22 6.1 Cleaning ..................22 Repair and Calibration ................23 Technical and Sales Assistance ............23 Limited Warranty ...................24 Warranty Repairs ...................24...
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Page 5: Introduction
Use only specified replacement parts when servicing the instrument. This symbol on the instrument indicates a WARNING and 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 product damage may result. Risk of electric shock. The voltage at the parts marked with this symbol may be dangerous. Ground Fault/Leakage Detector Model 2620... -
Page 6: Definition Of Measurement Categories
Receiving Your Shipment Upon receiving your shipment, make sure that the contents are consistent with the packing list. Notify your distributor of any missing items. If the equip- ment appears to be damaged, file a claim immediately with the carrier and notify your distributor at once, giving a detailed description of any damage. Save the damaged packing container to substantiate your claim. Ordering Information Ground Fault/Leakage Detector Model 2620....Cat. #2125.52 Includes user manual and warranty card. 1.4.1 Accessories and Replacement Parts Adapter – 4mm Non-insulated for Safety Leads ....Cat. #1017.45 (Converts male safety plugs to non-shielded male plugs) Artificial Neutral Model AN-1..........Cat. #1971.01 Includes instrument with soft carrying case;... -
Page 7: Product Features
CHAPTER 2 PRODUCT FEATURES Description The Model 2620 measures leakage current shunted to ground caused by insulation breakdown or leaks. It enables the operator to locate failures when or before they occur, without shutting down equipment or spending hours trouble-shooting. It is designed specifically for locating low current faults on high current loads. The detector is a sensitive AC current transformer capable of mea- suring differential or leakage current from 500µA, and may be used to measure current up to 400A continuous duty. -
Page 8: Connections
Connections The Model 2620 is compatible with most DMMs, voltmeters, or other voltage measuring instruments with the following features: • Range and resolution capable of displaying 1mV of input. • Voltmeter accuracy of 0.75% or better to take full advantage of the accuracy of the probe. • Minimum input impedance of 1MΩ. Connect the probe to the multimeter or other instrument. Select the appropriate AC voltage range on your multimeter. The Model 2620 has two selectable output ranges. The 4A range will pro- duce a mV/mA with an output of 4V at 4A. The 400A range produces 1mV/A with 400mV at 400A. Warning: User Safety Always use a DMM, voltmeter or other displaying device, appropriately rated for the working voltage and for safety. -
Page 9: Specifications
– < 15° < 10° 400A Range Nominal Current: 400A Measurement Range: 0.5A to 400A Output Signal: 1mV 400A Range 0.5 to 10A 10 to 100A 100 to 400A Accuracy 0.5% of R ± 0.5mV 0.35% of R ± 0.5mV 0.35% of R ± 1mV Phase Shift – < 1° < 0.6° Ground Fault/Leakage Detector Model 2620... -
Page 10: Mechanical
< 0.5% from 30Hz to 1KHz (1): 400 A/m 50Hz field perpendicular to the clamp opening (2): DC current coupled onto an AC current (3): Limited to 1KHz for 100A Mechanical Dimensions: 11.2 x 6.9 x 1.8" (285 x 175 x 45mm) Weight: 2.9 lbs (1300g) approx Jaw opening: 4.4" (112mm) Maximum Jaw Gap: 9.8" (250mm) Maximum Clamping Capacity: Max 4.5" (115mm) Ø cable Ground Fault/Leakage Detector Model 2620... -
Page 11: Environmental
Environmental Operating Temperature: -14° to 131°F (-10° to 55°C); 0 to 85% RH (non-condensing) Storage Temperature: -40° to 158°F (-40° to 70°C); 0 to 85% RH (non-condensing) Operating Altitude: ≤2000m on uninsulated conductors Transport Altitude: ≤12000m Safety Electrical Safety EN 61010, 600V CAT III Pollution Degree: 2 Electromagnetc Compatibility Industrial Environment: Criterion B Emissivity (EN 61326-1) Susceptibility (EN 61326-1) Self-extinguishing Capability Jaws and Casing: VO (UL 94) Ground Fault/Leakage Detector Model 2620... -
Page 12: Operation
The ground conductor must not pass through the detector. 4.1.2 Interpreting the Measurement Figure 1 is a schematic of a single-phase installation of a motor and an oven, both grounded. The numbers indicate the amplitudes of the currents in different conductors. This installation has no faults. If you clamp the detector around the cables at points A,B,C or D, it will output zero. 115V/230V OVEN MOTOR ZERO ZERO AMPERE AMPERE Figure 1 Ground Fault/Leakage Detector Model 2620... -
Page 13: Equipment Troubleshooting
Equipment Troubleshooting To locate a fault quickly, begin your troubleshooting at the incoming low- voltage distribution header. Successively check each feeder. If the Model 2620 detects a ground fault, follow the feeder downstream, branch by branch, to the equipment with the problem. It is useful to take measurements periodically to create a history of the quality of the insulation. This is good preventive maintenance which could prove valuable later. If you detect a fault current that is very low initially but increases from day to day, this means that electrical failure is immi- nent and should be taken care of during the next planned maintenance shutdown. -
Page 14: Testing Various Cable Configurations
In Figure 4, however, the instrument cannot “see” the fault because the shield is connected to the motor frame, letting the fault current return through the detector and causing it to read zero. If possible, take your measurement where you can avoid closing the shield in the clamp, such as the nearest control panel or inside the connecting box of the motor. Ground Fault/Leakage Detector Model 2620... - Page 15 Figure 3 Figure 4 One way to circumvent this shielded cable problem is shown in Figures 5 and 6. Here the shield is looped through the detector twice, so that the reading will be that of the fault current. Figure 5 Figure 6 Ground Fault/Leakage Detector Model 2620...
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Page 16: Grounded Neutral
The Model 2620 measures the vector sum of the enclosed currents. If you have, for example, a 400mA fault and a 250mA fault on the same phase, the Model 2620 will detect 650mA. But if the two faults are on different phases, they add vectorially and may even sum up to zero. Figure 7 shows an example in which there are two separate faults: 400mA on a machine in one shop, 250mA on a machine in another shop. The vector sum is not 650mA, but 350mA. If you switch off the machine with the 250mA fault, the reading increases, indicating faults on different phases. -
Page 17: Neutral Grounded Through An Impedance
4.3.4 Ungrounded System In order to measure on an ungrounded system, the optional Artificial Neutral Model AN-1 must be used in conjunction with the Model 2620. For measurement procedures, see the information in this manual in Chapter 5. Commonly Asked Questions Q. I have found an indication of 40 to 50mA on one of the main feed- ers with 300A on the line. - Page 18 Q. Would it be possible to clamp the Model 2620 directly around the grounding detector? A. Yes, in some instances it may be possible to detect fault current on a specific motor if there is a dedicated grounding path. However, if several...
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Page 19: Artificial Neutral
• The Artificial Neutral must always be in the OFF position when con- necting the leads. • Always make connections from the instrument to the circuit under test. • Always inspect the instrument and accessory leads for serviceability prior to use. Replace defective parts immediately. • Never use the instrument on electrical conductors rated above 600V. Description The Artificial Neutral is an accessory for the AEMC Model 2620 Ground Fault /Leakage Detector. It generates a grounded artificial neutral to allow the measurement of fault currents on ungrounded 3 phase systems. In an ungrounded system, the impedance between the transformer, neu- tral, and ground is infinity. Therefore, independent of the load cur r ent, no ground fault current should flow. The Artificial Neutral creates an intermittent return path for the ground fault current enabling the troubleshooter to distinguish it from load current. - Page 20 EN 61010, 600V, Cat. III, Pol. 2 Fast ARTIFICIAL NEUTRAL MODEL AN-1 Red light, showing 3 position switch: • ON, Slow test voltage present and Ventilation holes • OFF phase fault • ON, Fast test [Carrying case not shown] Figure 8 Ground Fault/Leakage Detector Model 2620...
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Page 21: Specifications
Relay Duty Time: Slow position: 0.5 s Fast position: 2.3 s Power Source: Eight 1.5V “AA” batteries Power Consumption: 180mA (approx) Average Battery Life: 40 hours 5.2.2 Mechanical Reference Temperature: 23°C ± 3°C Operating Temperature: 32° to 122°F (0° to 50°C); 10 to 90% RH Storage Temperature: -40° to 158°F (-40° to 70°C); 10 to 90% RH Case: Fire resistant polycarbonate UL94 Color: Yellow Dimensions: 8.7 x 5.4 x 5.9" (220 x 136 x 150mm) Weight: 2.9 lbs (1.3kg) 5.2.3 Safety Dielectric Strength Test: 6kV between terminal and case 600V CAT III Ground Fault/Leakage Detector Model 2620... -
Page 22: Principle Of Operation
Principle of Operation If there is not an insulation fault on the system, no leakage current will flow to ground. The vector sum of the currents flowing through the three con- ductors enclosed within the clamp is zero. The display will indi c ate zero (see Figure 9). Figure 9 If there is a fault, a leakage current then flows between the faulty phase and ground. The detection of this fault current on an ungrounded system will be intermittent as determined by the rate of relay closure (Figure 10). Figure 10 Due to the fault current, the vectorial sums of the current will no longer be zero. Fault current will be indicated by the selection on the Model 2620 clamp of either 1mV per mA or 1mV per A AC. Ground Fault/Leakage Detector Model 2620... -
Page 23: Testing Ungrounded Systems
After verifying that all the lights have illuminated properly, turn the instrument OFF and connect the GROUND lead to a known good ground. To measure the value of the fault, connect the Model 2620 to a multimeter with an appropriate measurement range. Enclose the three phase conductors within the jaws. Switch ON the Artificial Neutral (Fast or Slow) depending on the response time of the measuring instrument. The actual fault mea s urement must be made when the instrument relay is closed (e.g., when the buzzer sounds). The measured value when the relay is... -
Page 24: Maintenance
CHAPTER 6 MAINTENANCE WARNING: • For maintenance use only specified factory replacement parts. • 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 the circuits before opening the case. Cleaning • Wipe the case and jaw covers with a lightly moistened cloth and mild detergent. • Do not use any abrasives or solvents. • If rusted, the jaw mating surfaces of the Model 2620 may be lightly sanded with very fine sandpaper and then very lightly oiled. Wipe off excess oil and do not let it drip into the case. Ground Fault/Leakage Detector Model 2620... -
Page 25: Repair And Calibration
NOTE: You must obtain a CSA# before returning any instrument. Technical and Sales Assistance If you are experiencing any technical problems, or require any assistance with the proper operation or application of your instrument, please call, mail, fax or e-mail our technical support team: Chauvin Arnoux , Inc. d.b.a. AEMC Instruments ® ® 200 Foxborough Boulevard Foxborough, MA 02035 USA Phone: (800) 343-1391 (508) 698-2115 Fax: (508) 698-2118 E-mail: techsupport@aemc.com www.aemc.com NOTE: Do not ship Instruments to our Foxborough, MA address. Ground Fault/Leakage Detector Model 2620... -
Page 26: 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 28 ® CHAUVIN ARNOUX GROUP 05/17 99-MAN 100292 v8 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...
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