Related Manuals for Megger MGFL 100
Summary of Contents for Megger MGFL 100
- Page 1 5 Commonwealth Ave Woburn, MA 01801 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.com MGFL 100 Ground fault locator...
- Page 2 WARRANTY Products supplied by Megger are warranted against defects in material and workmanship for a period of two years following shipment. The warranty is void in the event of abuse (failure to follow recommended operating procedures) or failure by the customer to perform specific maintenance as indicated in this manual.
- Page 3 Table of contents Contents Section Description Page 1.0 Introduction ..............................4 1.1 Purpose of Manual ..........................4 1.2 Audience ..............................4 1.3 Items received ............................5 2.0 Safety ................................6 3.0 Technical specifications ...........................7 4.0 Connections and Controls ........................9 4.1 Transmitter connections .........................9 4.2 Transmitter controls and displays ......................9 4.3 Receiver connections ..........................10 4.4 Receiver controls and displays ........................10 5.0 MGFL100 Operations ..........................10...
- Page 4 If you find any discrepancies in the MGFL100 or have any comments, please send them to Megger via fax, e-mail or phone.
- Page 5 DC systems. With use of the optional AC Filter the MGFL100 can also be used to locate ground faults up to 400K ohms on online IT grounded AC systems. The MGFL100 receiver can also be placed in a mode that will allow it to trace 60Hz and 50Hz currents on TT grounded systems with ground faults. MGFL100 www.megger.com...
- Page 6 1.5 Definitions Section 1.5 Definitions This section defines the terms used throughout this manual. Term Definition Impedance The AC and DC components of the ground fault on the circuit being measured, when the sync cable or Capacitive Pick Up is not used. When the sync cable or Capacitive Pick Up are used the term will refer to the actual resistance (The DC component only) of the ground fault on the circuit being measured.
- Page 7 3.0 Technical specifications CAUTION! The equipment could be impaired from improper use. Read the complete manual before use. WARNING! The equipment should not be used while its battery door is removed or if there is any visible damage to the case or if the hardware holding the unit together has been loosened. Section 3.0 Technical Specifications SPECIFICATIONS REFERENCE 25ºC (77ºF)
- Page 8 3.0 Technical s[pecifications RECEIVER Visual Alarm Range Selectable - 30% / 40% / 50% / 60% / 70% of reference. Audio Alarm Range Selectable - 30% / 40% / 50% / 60% / 70% of reference. Receiver Filter Range Selectable 5.12Hz or 50 / 60Hz Save Saves Total Current, Resistive Current and Reactive Current Recall...
- Page 9 4.0 Connections and controls Shock MIL-STD-810G method 516.6 Drop test MIL-STD-810G method 516.6 Static Rigidity IEC 61010-1 section 8.2.1 Impact IEC 61010-1 section 8.2.2 Vibration MIL-STD-810G method 514.6 Annex C Loose Cargo MIL-STD-810G method 514.6 category 5. * Full Accuracy Specification guaranteed 0ºC to 50ºC Section 4.0 Connections and Controls Battery String Connections Section 4.1 Transmitter Connections...
- Page 10 4.3 Receiver connections Section 4.3 Receiver Connections The current clamp plugs into the CT inputs. The sync cable will plug into the “SYNCH” input. Section 4.4 Receiver Controls and Displays Battery test button: IT indicator: When lit this indicates the Press to view the status of the displayed value is total current.
- Page 11 5.1 Locating ground faults on ungrounded DC systems Before operating Verify the battery in the transmitter is fully charged, if the unit is to be operated off of battery. Turn on the transmitter and verify the battery indicator displays a fully charged battery Verify the receiver batteries are good.
- Page 12 5.1 Locating ground faults on ungrounded DC systems Connect the black terminal to the negative side of the battery string. Connect the red terminal to the positive side of the battery string. CAUTION Do not connect the equipment across voltages that exceed 600Vdc. This could cause damage to the unit. WARNING! Use only the provided fused test leads for connection to the battery.
- Page 13 5.1 Locating ground faults on ungrounded DC systems After the boot up is complete: View the positive and negative voltages as displayed in the top displays. The display with the lower voltage indicates the side of the string with the ground fault. Step 2: Press the appropriate output button based on the side of the string that has the fault.
- Page 14 5.1 Locating ground faults on ungrounded DC systems Step 3: Connect the receiver: Connect the current clamp to the receiver and place the current clamp around either the positive or negative output lead. Whichever one is outputting the current to the fault. Connect the sync cable between the receiver and transmitter Note the readings on the displays.
- Page 15 5.1 Locating ground faults on ungrounded DC systems Set the alarm level on the receiver to 50%. This can be either a visual only alarm or a visual and audio alarm, depending on how it is set If there are multiple panels then perform the procedure below. If there is only one panel skip to step 6. Step 5: Place the CT around the wires going into each panel.
- Page 16 5.1 Locating ground faults on ungrounded DC systems Problem: No panels indicate fault current. There may be multiple faults on various circuits. Lower the alarm level on the receiver from 50% to a lower value then repeat the measurements. If no fault can be identified then the fault is before the panels. Begin tracing from the batteries to the panels.
- Page 17 5.1 Locating ground faults on ungrounded DC systems Using the schematic of the circuit, start tracing the fault current through the circuit. Move the current clamp down the circuit to trace the fault. If the fault current is displayed on the top display of the receiver then the fault is still downstream. If the fault current is no longer displayed on the top screen of the receiver then you have passed the fault.
- Page 18 5.1 Locating ground faults on ungrounded DC systems Problem: The Current Clamp is too large to get around the cable. Use the active mini CT to measure the fault current on the small insulated cables. Be sure the CT has a good battery. Since the active CT has a different size core the fault current measurement may not exactly match the larger CT.
- Page 19 5.1 Locating ground faults on ungrounded DC systems Using the schematic of the circuit, start tracing the fault current through the circuit. Move the current clamp down the circuit to trace the fault. If the fault current is displayed on the top display of the receiver then the fault is still downstream. If the fault current is no longer displayed on the top screen of the receiver then you have passed the fault.
- Page 20 5.2 Locating a ground faults on IT grounded systems Section 5.2 Locating a ground faults on IT grounded systems Connection Connect the green safety earth cable from the safety ground on the unit to earth. This can be a pipe or conduit that is tied to earth or an earth stake or equivalent.
- Page 21 5.2 Locating a ground faults on IT grounded systems WARNING! Use only the provided fused test leads for connection to the battery. WARNING! Wear proper PPE equipment when connecting the unit. Do not place the transmitter on unstable surfaces or on the batteries or battery rack. If operating the transmitter off of AC then plug the power adapter into transmitter as shown.
- Page 22 5.2 Locating a ground faults on IT grounded systems Problem: No readings are displayed. If OL is displayed for the resistive reading then this can indicate a high impedance fault. Continue raising the voltage until a stable reading is shown. There is no problem if the capacitive reading displayed is 0.00.
- Page 23 5.2 Locating a ground faults on IT grounded systems Step 4: Press the SAVE button on the receiver. This will save 3 values. The total current being drawn by the circuit. The resistive current being drawn by the fault. (The fault current) The reactive current being drawn by stray capacitance.
- Page 24 Section 5.3 Locating a ground faults on TT grounded systems Step 5: Using the schematic of the circuit, start tracing the fault current through the circuit. Move the current clamp down the circuit to trace the fault. If the fault current is displayed on the top display of the receiver is approximately unchanged then the fault is still downstream.
- Page 25 Section 6.0 Setting Voltage and Current Limits The receiver will now measure the fundamental current. Place the CT around the wires to see the path of the current. Place the CT around the earth and note the fault current. Now reference the schematic and trace back to locate the fault.
- Page 26 Section 7.0 Replacement Parts Turn the rotary knob clockwise until the password “527” is displayed. Then push the “+” button to enter the password. Set the maximum voltage limit by turning the rotary knob until the desired limit is displayed. Then push the “+”...
- Page 27 8.0 Maintenance Transmitter 1011-308 Transmitter that outputs signal to Supplied by manufacturer only locate fault. Complete with cables and AC power adapter. Receiver 1011-309 Receiver that displays fault current Supplied by manufacturer only and reactive current. Includes ICLAMP and sync cable. ICLAMP 1011-353 Accessory –...
- Page 28 8.2 Receiver battery replacement Section 8.2 Receiver battery replacement Verify the receiver is powered off. Remove the single screw holding the rear battery panel on the receiver. Remove the panel to access and replace the batteries. Receiver batteries should be removed when the receiver is stored for long periods.
- Page 29 This instrument is manufactured in the United States. The company reserves the right to change the specification or design without prior notice. Megger is a registered trademark MGFL100_UG_en_V01 © Megger Limited 2021 MGFL100...
- Page 30 The company reserves the right to change the specification or design without prior notice. Megger is a registered trademark The Bluetooth word mark and logos are registered trademarks owned by Bluetooth SIG, ® Inc and is used under licence. Part No: MGFL100_UG_en_V01 ©...
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