Circutor MPC-20 Instruction Manual
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Circutor MPC-20 Instruction Manual

Circutor MPC-20 Instruction Manual

Step and touch voltage tester. ground resistance tester
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STEP AND TOUCH VOLTAGE TESTER
GROUND RESISTANCE
MPC-20
MPC-50
INSTRUCTION MANUAL
TESTER
(20 A) code 7 70 123
(50 A) code 7 70 075
( M98113601-20 / 03A )
CIRCUTOR S.A.
(c)

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  • Page 1 STEP AND TOUCH VOLTAGE TESTER GROUND RESISTANCE TESTER MPC-20 (20 A) code 7 70 123 MPC-50 (50 A) code 7 70 075 INSTRUCTION MANUAL ( M98113601-20 / 03A ) CIRCUTOR S.A.

  • Page 2: Table Of Contents

    Power supply 4.2.- Dimensions, weight: 5.1.1 Attaching the equipment 4.3.1 Features as a step and touch voltage tester. MPC-20 TESTER 4.3.2 Features as a step and touch voltage tester. MPC-50 TESTER 4.4.- Features as an ground resistance tester ..........TESTING STEP OR CONTACT VOLTAGE...

  • Page 3: Mpc 20 & 50 Tester - M-981136 (Vers. Bd)

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page CHAPTER II ..............EXISTING STANDARDS Abstract and table of voltages Standards relating to the MPC-20 / MPC-50 CORRECTION OF THE READ OUTS ............................MAINTENANCE ..............10.- TECHNICAL SERVICE...

  • Page 4: Mpc-20 - Mpc-50

    MPC-20 & MPC-50 1.- PRELIMINARY WARNINGS: 1.1.- USUAL OPERATING PROCEDURE The MPC-20 and MPC-50 testers are compact and robust and are designed to test where large powers are needed for a short period of time: - MPC-20: up to 12 kVA...

  • Page 5: Precautions Whilst Operating

    For example: A 5 Ohms auxiliary electrode creates a voltage of 250 V around itself. VOLTAGE MAY REACH 600 V AROUND THE CABLE OUTPUT with the MPC-20 and 400 V with the MPC-50. THE POWER CIRCUIT CONNECTIONS MUST NEVER BE HANDLED WITHOUT HAVING FIRST STOPPED THE EQUIPMENT AND REMOVED THE OPERATING KEY.

  • Page 6: Description Of The Main Components

    2.- DESCRIPTION OF THE MAIN COMPONENTS 2.1.- VOLTAGE SOURCE MPC-20: voltage source, with 10 regulating scales using a switch and fine adjustment using a dial. Supplies a regulable voltage between 0 and 600 V and is set for a current of 20 A. It can test to 20 A in installations with a 30 Ohms resistance (ground and auxiliary added).

  • Page 7: Control And Connection Features Of The Mpc-20 / Mpc-50

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page 3.- CONTROL AND CONNECTION COMPONENTS OF THE MPC-20 & MPC-50 3.1.- CONTROL ELEMENTS VOLTAGE OUTPUT SWITCH MPC-20: FROM 1 TO 10 MPC-50: FROM 1 TO 8 Switch MPC-20 MPC-50...

  • Page 8: Internal Connection Components

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page 3.3.- INTERNAL CONNECTION COMPONENTS MPC-20: 30 AND 31 SINGLE PHASE POWER SUPPLY: 230 V TERMINAL WITH OBLIGATORY EARTHING CONNECTION MPC-50: 30 AND 32 SINGLE PHASE POWER SUPPLY: 400 V...
  • Page 9 --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page Control panel: ENTRADA TENSION VOLTAGE INPUT CIRCUIT BREAKER LIGHT PILOTO TERMICO CONMUTADOR DE OUTPUT 1 TO 8 SALIDAS 1 AL 8 SWITCH SYSTEM LIGHT PILOTO RED GENERAL SWITCH INT. GENERAL AMPERIMETRO AMMETER ERRATICAS...

  • Page 10: Main Features

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page 4.- MAIN FEATURES 4.1.- POWER SUPPLY POWER SUPPLY MPC-20 MPC-50 VOLTAGE 230 ± 10 % 400 ± 10 % SINGLE PHASE SINGLE PHASE 230 V exception FREQUENCY 50 / 60 Hz...

  • Page 11: Features As A Step And Touch Voltage Tester. Mpc-20 Tester

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page 4.3.- TESTING STEP AND CONTACT VOLTAGE 4.3.1.- MPC-20 TESTER CURRENT 0 ÷ 20 A REGULABLE OVERVOLTAGE 1, 1 In, 1 Min VOLTAGE 0 ÷ 600 V, 10 SCALES AND FINE ADJUSTMENT MAX.

  • Page 12: Features As A Step And Touch Voltage Tester. Mpc-50 Tester

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page 4.3.2.- TESTING STEP AND CONTACT VOLTAGE: MPC-50 TESTER CURRENT 0 ÷ 50 A REGULABLE OVERVOLTAGE 1, 1 In, 1 Min VOLTAGE 0 ÷ 400 V, 8 SCALES AND FINE ADJUSTMENT MAX.

  • Page 13: Features As An Ground Resistance Tester

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page METHOD USED INJECTION AND TESTING OF CURRENT MPC-20 : 0 ÷ 20 A MPC-50 : 0 ÷ 50 A TESTING VOLTAGE BETWEEN GROUND AND NEUTRAL AREA (Vm) CALCULATES: Rt.=Vm/Ip...

  • Page 14: Testing Step Or Contact Voltage

    5.4.- ATTACHING THE MPC-20/ MPC-5 To test correctly, the MPC-20 or the MPC-50 must be placed 20 or more metres from the ground to be tested. Do not place it in the area occupied by the electrodes in the ground.
  • Page 15 --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page DIAGRAM FOR TESTING STEP VOLTAGE 1 metre Tested GROUND voltage TO BE TESTED L (minimum 20 metres) Test intensity lp AUXILIARY GROUND ----------------------------------------------------------------------------------------------------------- DIAGRAM FOR TESTING CONTACT VOLTAGE Metal parts L (minimum 20 metres) Tested voltage...

  • Page 16: Connecting The Current Circuit

    Page 5.6.- CONNECTING THE CURRENT CIRCUIT ENSURE THAT THE SELECTOR (ON-OFF-ON) ON THE MPC-20 & MPC-50 IS DISCONNECTED AND WITHOUT THE KEY Connect the "OUTPUT CABLES": to the ground to be measured and the other to the auxiliary ground. 5.7.- CONNECTING THE POWER SUPPLY 5.7.1.- POWER SUPPLY FOR THE MPC-20:...

  • Page 17: Setting The Maximum Default Current

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page 5.8.- SETTING THE MAXIMUM DEFAULT CURRENT Once the connections described above have been made and after taking SAFETY MEASURES, testing can be done in the following way: Place the regulator on the "0%" position. Place the Voltage switch on position "1".

  • Page 18: Attaching The Testing Electrodes

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page 5.9.- ATTACHING THE TESTING ELECTRODES - Attach the touch electrodes (25 kg weights) in a suitable place to start testing: STEP VOLTAGE Attach the two touch electrodes 1 metre apart and near to the ground to be tested.

  • Page 19: Step Or Touch Voltage

    Adjustments are done by trial and error between the different regulation scales, starting with the lowest: 1 to 10 on the MPC-20 and from 1 to 8 on the MPC-50. Switching from one scale to another is always done “off line”, i.e.

  • Page 20: Test Results

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page READ TESTED VOLTAGE (V) on the display. Note: If the read out on the display is less than 30 V the internal scale is automatically changed to 30 V AC. DISENGAGE THE OPERATION SELECTOR.

  • Page 21: Testing Ground Resistance

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page 6.- TESTING GROUND RESISTANCE The main advantage of testing ground resistance using high currents is that as well as being measured, the ground is also being tested to see if it is capable of accepting such a current.

  • Page 22: Attaching And Connecting The Mpc-20 / Mpc-50

    (See section 8 "CORRECTING READ OUTS"). 6.6.- TESTING GROUND RESISTANCE If testing has to be done at 20 A (MPC-20) or at 50 A (MPC-50), adjustments are made according to section 11.3.2. If testing has to be done with currents below 20 A or 50 A respectively, the adjustment is also done by trial and error between the different regulation scales starting with the lowest (1, 2, 3, ...).

  • Page 23: Test Results

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page Measurements are taken automatically on turning the key (the voltmeter and the ammeter begin testing on turning the key and block measurements when the key is no longer turned). BEFORE TURNING THE SELECTOR MAKE SURE THAT NO ONE IS USING THE POWER OR TESTING CIRCUIT.

  • Page 24: Repeating Tests

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page 6.8.- REPEATING TESTS Ensure that the measuring electrode is actually testing the voltage drop in the ground that is being tested which is a consequence of the current injected by the MPC itself.

  • Page 25: Existing Standards

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page CHAPTER II 7.- EXISTING STANDARDS 7.3.- SUMMARY OF HIGH VOLTAGE REGULATIONS The Technical Complementary instruction MIE-RAT-13 published in the B.O.E. (Official State Gazette) 183 of 1 August 1984, section 1.1. sets the maximum admissible step and touch voltages for EARTHING INSTALLATIONS.
  • Page 26 0.1 s or less 7200 V 720 V * Supposes that the real step voltage on the human body is less than that measured (shoes, etc.). 7.4.- STANDARDS REFERRING TO THE MPC-20 / MPC-50 MIE-RAT-01 MIE-RAT-13 MIE-RAT-19 BOE 183 1...

  • Page 27: Correction Of The Read Outs

    --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page 8.- CORRECTING THE READ OUTS Results from testing touch or step voltages may be incorrect due to the existence of erratic, vagabond or parasite currents passing through the ground. The B.O.E.
  • Page 28 --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page DERIVATION OF THE FORMULA FOR STEP AND CONTACT VOLTAGE The following equations are derived from the graph: × × sen ) ß cos ) ß − × × ß ß...

  • Page 29: Maintenance

    10.- TECHNICAL SERVICE In the event of any equipment failure or any operational queries please contact the technical service of CIRCUTOR S.A. CIRCUTOR S.A. - After sales service c / Lepanto , 49...
  • Page 30 --- MPC 20 & 50 TESTER - M-981136 (vers. BD) Page APPENDIX MPC-50 INTERNAL TERMINAL BOARD CAMBIO DE CHANGING TENSIÓN VOLTAGE FUSIBLE OPERATING FUSE MANIOBRA 400 V 230 V CHANGE OF VOLTAGE: - Attach the voltage bridge in the required position - Attach the indicating tag on the external supply cable...

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Mpc-50

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