Operating Manual. Micro-Ohmmeter VG-CS200 VG-CS300 VG-CS400 VG-CS600

Transcription

1 Operating Manual Micro-Ohmmeter VG-CS200 VG-CS300 VG-CS400 VG-CS600

2 Warranty Mostec AG warrants this product to be free of manufacturing defects for a 2-year period after the original date of purchase. Within this period, defective products will be repaired free of charge provided that the defect occurred during normal operation. This warranty does not cover damage to the product resulting from ordinary usage such as front panel scratches, broken control elements and corrosion, etc. The customer is responsible for shipping and packing charges for products returned under warranty to Mostec AG. Transportation damages are not covered by the warranty and should be referred to the respective delivery service. Technical description The micro-ohmmeters VG-CS200/300/400 and VG-CS600 are used for ohmic measurements of high power switches etc. All instruments are identical, except the maximal measuring current. The strengths of the instruments are the easy handling, rugged design and low weight. The two different kinds of displays, red LED`s and back lighted LCD, enables measurements in darkness, coldness and full sunlight. Designed for continuous measurements, the instrument has no limitation for the numbers of current cycles. An internal thermal printer is standard to enable logging of test results. With the option remote logging all stored measuring values can be downloaded to a personal computer or laptop. A cable remote control is optionally available. The VG-CS200, with a weight of 8kg only, makes it very handy and easy transportable and the rugged case contains all test cables. Typical applications are ohmic tests of: - Circuit breakers - Disconnecting switches - High current busbar joints - Cable splices - Welding joints - Ground connections Page 2

3 Index: Page 1 Safety regulations 4 2 Operating instructions 4 3 Control panel 5 4 Power ON 6 5 Main menu 6 6 System menu 6 7 System menu, description 7 8 System menu, flow chart 8 9 Result window 9 10 Start/Stop the measurement 9 11 LED display 9 12 Printer 9 13 Error messages 9 14 Instrument temperature monitoring Application example - one side grounded Application example - both sides grounded Verify measuring current Technical data Notes Page 3

4 1. Safety Regulations Always comply with local safety regulations when using the Micro-Ohmmeter. Always connect protective earth (ground). Read and comply with the safety regulations in this manual before using Micro-Ohmmeter. Never open a breaker as long as the Micro-Ohmmeter is connected. High voltage/currents can occur at the input/output clamps. The connection joints of the high current cables may become hot during a test. 2. Operating Instructions 1. Keep the Micro-Ohmmeter disconnected from the mains while making connections. 2. Ground one side of the test object. 3. Ground the Micro-Ohmmeter. 4. Connect the current cables to the test object. 5. Connect the two sense cables as close as possible to the test object. 6. Connect the Micro-Ohmmeter to the mains and switch it ON. 7. The Micro-Ohmmeter powers up and shows the startup text on the display and on the printer. 8. Select the desired measuring current with the "ADJUST" keys [+] and [-] or use a preset current with the keys [F1] or [F2]. 9. Start the measurement with [Start/Stop]. To change the instrument settings, see menu flow chart page Page 4

5 3. Control Panel 01. LCD display 02. Keys to control the menu functions 03. LED display indicating the value R and I 04. Increment/decrement keys for menus and values 05. Status LED s indicating the actual measuring status 06. Error LED when the adjusted current could not be reached 07. Start/Stop keys with status LED 08. Temp. Sensor RS232/V24 for PT USB Interface for communication to PC 10. Remote control connector 11. Mains plug 12. Main switch 13. Ground terminal 14. Raw signal shunt voltage terminals 15. Printer 16. DC - current output 17. DC+ current output 18. Clamp sense input 19. Sense terminals 20. Case screws Warning: Opening the instrument case voids the warranty Page 5

6 4. Power ON After power up the display shows the welcome message for 3 seconds. After that, the display shows the main menu. 5. Main Menu Iset = Menu = The previously set measuring current. By using the [+] and [-] keys, located below the red displays, the measuring current can be changed. Pressing [Ent], the user enters the system menu. Further explanations see below. Reslt = Pressing [Esc], the user enters the window with the measuring results. 50A = 100A = 6. System Menu Fast preselected value 1 of the measuring current. By pressing [F1], the measuring current Iset is changed to 50A. This value can be changed in the system menu. Fast preselected value 1 of the measuring current. By pressing [F2], the measuring current Iset is changed to 100A. This value can be changed in the system menu. Pressing [Ent] in the main menu leads to the system menu. In this menu, the user can navigate between the items by [F1] and [F2]. [Ent] selects the actual indicated item. The data of the selected item can be modified using the keys [+] and [-]. To store the modified data and leave the selected menu item, use the [Ent]. Press [Esc] to leave without storing the data Page 6

7 7. System Menu, Description Menu item: Legend: range of values: SM 0 Continuous Mde= On/Off The measuring current flows continuously until it's interrupted by the user. Selection only possible for 200A instruments! Normal = the measuring current only flows for a fixed given time. SM 1 Current= 5A to 200A (600A) Preset current 1. The adjusted value appears in the main menu above [F1]. SM 2 Current= 5A to 200A (600A) Preset current 2. The adjusted value appears in the main menu above [F2]. SM 3 Buzzer= On/Off Key click and audio warning during the measurement and error message. SM 4 24/12h Format= On/Off Time format 12.00am = ON SM 5 Hours= 0 12 / 0 23 Hours adjust of the internal clock. SM 6 Minutes= 0 59 Minutes adjust of the internal clock. SM 7 DDMMYY/MMDDYY Format= On/Off Date format month/day/year = ON SM 8 Year= Year adjust of the internal calendar. SM 9 Month= On/Off Month adjust of the internal calendar. SM 10 Day= 0 31 Day adjust of the internal calendar. SM 11 Erase measurement Y/N Erase all saved measurements. SM 12 Counter Printouts= Incremental counter for the printout. The printouts are incrementally numbered and it starts with the number set by SM11. SM 13 Printout all values= On/Off When On, ramp times will additionally be printed. SM 14 Current Clamp= On/Off The instrument calculates the current which can be bypassed through the grounding connections. This value is subtracted from the measuring current which flows through the equipment under test. When this item is ON, the instrument immediately asks for the external clamp sensitivity in mv/a Page 7

8 Menu item: Legend: range of values: SM 15 Temp. Compensation On/Off When this item is ON, the instrument immediately asks for the temperature coefficient (α). SM 16 Language English The user can switch the language. Deutsch Español Swenska Française 8. System Menu, Flow Chart Main Menu 9:37 Iset= 50A Menu Reslt 150A 200A Press F1 Iset=150A Press F2 Iset=200A Adjust in SM1/SM2 Setup Menu SM 0 Continuos/Normal Setup Menu SM 1 Preset Current 1 Setup Menu SM 2 Preset Current 2 Setup Menu SM 3 Buzzer 13: No: uΩ 150A Setup Menu SM 4 Time Format print exit < > Setup Menu Prints the indicated results on the internal printer Setup Menu SM 5 Hours Setup Menu SM 6 Minutes Setup Menu SM 7 Date Format To modify values in the setup menu press the ENT key and change the value or the state with the ADJUST keys. Then press ENT to save the changes or ESC to disregard it. Setup Menu SM 8 Year Setup Menu SM 9 Month Setup Menu SM10 Day Setup Menu SM16 Language Setup Menu SM11 Erase measurements Setup Menu SM15 Temp. Compensation Setup Menu SM12 Counter Printouts Setup Menu SM14 Current Clamp Setup Menu SM13 Printout all values Page 8

9 9. Result Window The result window can be activated by pressing the key below the text Reslt in the main menu. It will also be activated if a measurement has been completed. During continuous mode, the result window is continuously updated after a completed measuring cycle. The Micro- Ohmmeter stores the last 100 data sets. Line 1 = Time and date of the current test Line 2 = Storing location #16, ohmic value and test current Line 3 = When the external current clamp is activated, the clamp current. [Ent] Printing the data set [Esc] Back to the main menu [F1] Show/print the next result [F2] Show/print the previous result 10. Start/Stop Measurement The measurement is started by [Start/Stop]. This process is announced by the red blinking LED and, if activated, a pulsating audio alarm (Buzzer). The measurement can be aborted by [Start/Stop] or [ESC]. 11. LED Displays The two red LED displays are for better readability in darkness. The instrument indicates the result twice, on the LCD and the LED display. The upper LED display shows the value for resistance "R" and the lower LED the value for actual measuring current "I". During the current adjustment, the red LED display indicates Iset. 12. Printer The printer is maintenance free and the paper can be easily changed. The button above the paper output is for manual paper feed. The green LED lamp indicates "printer ready". 13. Error Messages The Micro-Ohmmeter can detect and display different errors. Fault Cause Remedy Sense line broken Sense line defective or broken Verify the sense line connections Overflow Resistance > 999.9mΩ Bad connection and/or too large resistance Measuring current 1. Instrument overheated 1. Cool down the instrument value not reached 2. Resistance > 999.9mΩ 2. Bad connection or too large resistance Page 9

10 14. Instrument Temperature Monitoring The Mirco-Ohmmeter has a temperature surveillance controller. At >40 C internal temperature, the LCD display shows the inside temperature, right, on the first line. At >50 C it derates the test current. At >70 C the measuring current is set zero. For more cycles, wait until the internal temperature decreases. internal temperature Page 10

11 15. Application Example - one side grounded Comply to the safety regulations and operation instructions when using the Micro- Ohmmeter. See page 4 Important: The sensing cables must be connected inside the current cables. Otherwise the test data may be incorrect Note: If you are measuring resistance in a breaker or disconnecting switch (isola tor), make sure that it is closed before starting. High current must only flow throughout a short interval. 1. Make certain the mains are de-energized on both sides of the breaker. Ground the breaker on one side and make certain it is closed. 2. Keep the Micro-Ohmmeter disconnected from the mains while making connections. 3. Ground the Micro-Ohmmeter. 4. Connect one current cable between one side of the object being tested and the DC+ terminal on Micro-Ohmmeter. Connect the other current cable between the other side of the object being tested and the COM terminal on Micro-Ohmmeter. 5. Connect the two sensing cables (using the same polarities as those used for the current cables) on two sides of the test object and as close to the test object as possible. 6. Connect the Micro-Ohmmeter to the mains. 7. Switch on the Micro-Ohmmeter. 8. Set the test current using the keys <+> and <-> or use one of the preselected currents using the <F1> or <F2> key. Note: If you are using the instrument the first time, make sure that the continuous mode (Setup Menu SM0, see page 7) is not selected. Also verify that the current clamp is switched off (Setup Menu SM14, see page 7). 9. Press the <START/STOP> key. The measurement is announced by a red blinking LED, green Status LED s and if activated a pulsating audio alarm (Buzzer). The result is shown after some seconds. The result is saved, you can make a printout and/or run a new test. 10. You can stop the measurement by pressing <START/STOP> or <ESC> keys. 11. Turn off and disconnect the Micro-Ohmmeter from the mains before doing any disconnection work or moving any cables or wiring Page 11

12 16. Application Example - both sides grounded Comply to the safety regulations and operation instructions when using the Micro- Ohmmeter. See page 4 Important: The sensing cables must be connected inside the current cables. Otherwise the test data may be incorrect Note: If you are measuring resistance in a breaker or disconnecting switch (isola tor), make sure that it is closed before starting. High current must only flow throughout a short interval. 1. Make certain the mains are de-energized on both sides of the breaker. Ground the circuit breaker on both sides and make certain it is closed. 2. Keep Micro-Ohmmeter disconnected from the mains while making connections. 3. Ground Micro-Ohmmeter 4. Connect one current cable between one side of the object being tested and the DC+ terminal on Micro-Ohmmeter. Connect the other current cable between the other side of the object being tested and the COM terminal on Micro-Ohmmeter. 5. Connect the two sensing cables on two sides of the test object and as close to the test object as possible. 6. Connect the external current clamp to one of the ground bars of the breaker and the clamp outputs to the CT INPUT on Micro-Ohmmeter. 7. Connect Micro-Ohmmeter to the mains. 8. Switch on Micro-Ohmmeter. 9. Set the test current using the keys <+> and <-> or use one of the preselected currents using the <F1> or <F2> key. Note: If you are using the instrument the first time, make sure that the continuous mode (Setup Menu SM0, see page 7) is not selected. 10. In the "Setup Menu", "SM14" (see page 7) switch on the current clamp and key in the proper sensitivity of the current clamp you are using. Confirm by pressing <ENT>. 11. Press the <START/STOP> key. 12. You can stop the measurement by pressing <START/STOP> or <ESC> keys. 13. If the current through the ground bar was too high compared to the current through the breaker, adjust the test current and start the measurement again. Repeat this step, until the current through the breaker meets your requirements. 14. Turn off and disconnect the Micro-Ohmmeter from the mains before doing any disconnection work or moving any cables or wiring Page 12

13 17. Verify measuring current Comply to the safety regulations and operation instructions when using the Micro- Ohmmeter. See page 4 1. Connect mv-meter to the shunt output 2. Calculate the measuring current: For Example: VG-CS200 Shunt voltage = 300uV/A For Example: VG-CS600 Shunt voltage = 100uV/A Measuring mv Measuring Current = Shunt voltage uv/a Page 13

14 18. Technical Data Page 14

15 19. Notes Page 15

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