Circutor MPC-20, MPC-50 Instruction Manual

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 )

(c)

CIRCUTOR S.A.

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1.- MPC-20 - MPC-50 .................................................................... 4

1.1 Usual operating procedure 4

1.2 Precautions whilst operating 5

2.- DESCRIPTION OF THE MAIN COMPONENTS ...................................... 6

2.1 Source of regulated voltage 6

2.2 Control and protection circuit 6

2.3 Voltage and current tester 6

2.4 Touch electrodes 6

2.5 Accessories 6

3.- CONTROL AND CONNECTION FEATURES OF THE MPC-20 / MPC-50 .... 7

3.1 Control Components 7

3.2

External connection components 7

3.3

Internal connection components 8

4.- MAIN FEATURES ............................................................................. 10

4.1.- Power supply 10

4.2.- Dimensions, weight:

5.1.1 Attaching the equipment 14

4.3.1 Features as a step and touch voltage tester. MPC-20 TESTER 11

4.3.2 Features as a step and touch voltage tester. MPC-50 TESTER 12

4.4.- Features as an ground resistance tester 13

5.- TESTING STEP OR CONTACT VOLTAGE............................................ 14

5.1 Installation and start-up 14

5.2 Attaching the MPC-20 / MPC-50 14

5.3 Auxiliary ground for current injection 14

5.4 Connecting the current circuit 16

5.5

Connecting the power supply 16

5.6

Setting the maximum default current 17

5.7

Attaching the testing electrodes 18

5.8

Button for testing erratic currents 18

5.9 Adjusting the current and testing the

STEP or TOUCH VOLTAGE 19

5.10

Test results 20

6.- TESTING GROUND RESISTANCE ..................................................... 21

6.1 Attaching and connecting the MPC-20 / MPC-50 22

6.2 Attaching the "MEASURING ROD" 22

6.3 Testing erratic voltages 22

6.4 Testing ground resistance 22

6.5 Test results 23

6.6 Repeating tests 24

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CHAPTER II

7.- EXISTING STANDARDS ................................................................... 25

7.1 Abstract and table of voltages 25

7.2 Standards relating to the MPC-20 / MPC-50 26

8.- CORRECTION OF THE READ OUTS .......................................................... 27

9.- MAINTENANCE............................................................................... 29

10.- TECHNICAL SERVICE ..................................................................... 29

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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

- MPC-50: up to 20 kVA

Its microprocessor controlled testing system ensures that tests are made

in approximately 10 seconds.

Its portability means that weight has been kept to a minimum with the

use of minimal loss toroidal transformers.

Heat generated by the transformer windings is continuously eliminated
by an in-built ventilation system. It is able to operate indefinitely, making 12 sec.
tests at 40 sec. intervals. If for any reason it overheats, a red indicator light will
show why and will prevent it from operating until normal temperature is re­established.

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1.2.-  WARNINGS!

THE CURRENT USED FOR MEASUREMENTS, 20 A with the MPC­20 and 50 A in the MPC-50, IS SUFFICIENT TO CREATE SIGNIFICANT
VOLTAGES AROUND THE ELECTRODES, ESPECIALLY THE AUXILIARY
ELECTRODES.

PLEASE TAKE ALL NECESSARY PRECAUTIONS TO AVOID

ACCIDENTS.

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.

BEFORE ANY MEASUREMENTS ARE TAKEN, SIGNS MUST
PREVENT PEOPLE FROM PASSING THROUGH OR REMAINING IN THE
INJECTED CURRENT AREA. IN THE EVENT OF HIGH GROUND
RESISTANCES, VOLTAGES UP TO 600 V MAY BE CREATED, WHICH ARE
FATAL TO ANIMALS OR PERSONS NEAR TO THE DISPERSERS DURING
TESTS.

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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).

MPC-50: voltage source, with 8 regulating scales using a switch and fine

adjustment using a dial. Supplies a regulable voltage between 0 and 400 V and
is set for a current of 50 A. It can test to 50 A in installations with a 8 Ohms
resistance (ground and auxiliary added).

The remaining components are the same in each:

2.2.- CONTROL AND PROTECTION CIRCUIT

Button for testing erratic currents. Two directional selector key to control the
current injection (0º and 180º): Line voltage indicator. Over heating indicator.
Fuse protection for the operating circuit Protective circuit breakers for all the
equipment and for the output circuit.

2.3.- VOLTAGE AND CURRENT TESTER, controlled by micro-processor. It

test and also calculates Vp, Vc and Rt. The alphanumeric liquid crystal display
shows preset data, measurements and calculations.

2.4.- TOUCH ELECTRODES, that are cylindrical, 200 square cm at the base

and weigh 250 N, with carrying handles and terminals for connecting the testing
cables.

2.5.- ACCESSORIES. 50 metre cables, 10 mm in diameter with terminals for

current injection. 50 metre cables for voltage reading. Bridging cable to join the
two touch electrodes.

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3.- CONTROL AND CONNECTION COMPONENTS OF THE MPC-20 & MPC-50

3.1.- CONTROL ELEMENTS

1 VOLTAGE OUTPUT SWITCH
MPC-20: FROM 1 TO 10
MPC-50: FROM 1 TO 8

Switch

Position

MPC-20 MPC-50

1 0 to 60 V 0 to 50 V
2 0 to 120 V 50 to 100 V
3 20 to 180 V 100 to 150 V
4 180 to 240 V 150 to 200 V
5 240 to 300 V 200 to 250 V
6 300 to 360 V 250 to 300 V
7 360 to 420 V 300 to 350 V
8 420 to 480 V 350 to 400 V
9 480 to 540 V
10 540 to 600 V

2 FINE REGULATION CONTROL (according to previous table)

3 RED TEMPERATURE INDICATOR

4 RED SYSTEM VOLTAGE INDICATING LIGHT

5 ANALOGUE AMMETER FOR ADJUSTMENT AND ASSISTANCE

6 GENERAL AND OUTPUT CIRCUIT BREAKER

7 SELECTOR WITH KEY OPERATE THE TEST

8 LIQUID QUARTZ DISPLAY

9 3 BUTTONS TO PRESET Imax VALUE

10 BUTTON TO SELECT OPERATING MODE (Vp/c or Rt)

11 BUTTON FOR ERRATIC VOLTAGE MEASUREMENTS

999

999999

999

ENTER

ENTERENTER

ENTER MODE

MODEMODE

MODE

3.2.- EXTERNAL CONNECTION COMPONENTS

12 OUTPUT TERMINALS: MAX 50 A, MAX 600 V

13 VOLTAGE INPUT TERMINALS TO THE VOLTMETER

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3.3.- INTERNAL CONNECTION COMPONENTS

MPC-20:

30 AND 31 SINGLE PHASE POWER SUPPLY: 230 V
T.T TERMINAL WITH OBLIGATORY EARTHING CONNECTION

MPC-50:

30 AND 32 SINGLE PHASE POWER SUPPLY: 400 V
30 AND 31 SINGLE PHASE POWER SUPPLY: 230 V (EXCEPTIONAL)
T.T TERMINAL WITH OBLIGATORY EARTHING CONNECTION

SIZE:

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Control panel:

999-> 999 ENTER ESC

RT-VPC

0º OFF 180º

(LLAVE)

ERRATICAS

ENTRADA TENSION

Vm

PILOTO RED

PILOTO TERMICO

CONMUTADOR DE
SALIDAS 1 AL 8

1

2

0

50

A

MPERIMETRO

INT. GENERAL

DISPLAY

VOLTAGE INPUT

CIRCUIT BREAKER LIGHT

SYSTEM LIGHT

GENERAL SWITCH

AMMETER

OUTPUT 1 TO 8
SWITCH

ERRATICS

(KEY)