Manual Gossen Metrawatt PROFITEST MPRO (page 91 of 96) (English)

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GMC-I Messtechnik GmbH 91

Tests for electrical systems include “visual inspection”, “testing”

and “measurement”, and thus may only be conducted by experts

with appropriate work experience.

In the final analysis, the values from VDE 0664 are technically

binding.

21.3 Testing Electrical Machines per DIN EN 60204 –

Applications, Limit Values

The PROFITEST 204+ test instrument has been developed for the

testing of electrical machines and controllers. After a revision to

the standard in 2007, measurement of loop impedance is now

additionally required. Measurement of loop impedance, as well as

other measurements required for the testing of electrical

machines, can be performed with test instruments from the

PROFITEST MASTER series.

Comparison of Tests Specified by the Standards

Uninterrupted Connection of a Protective Conductor

Uninterrupted connection of a protective conductor system is

tested here be using an alternating current of 0.2 to 10 A with a

line frequency of 50 Hz (= low-resistance measurement). Testing

must be conducted between the PE terminal and various points

within the protective conductor system.

Loop Impedance Measurement

Loop impedance Z

L-PE

is measured and short-circuit current I

ascertained in order to determine if the breaking requirements for

protective devices have been fulfilled (see section 8).

Insulation Resistance Measurement

All of the active conductors in the primary circuit are short-cir-

cuited at the machine (L and N, or L1, L2, L3 and N) and mea-

sured against PE (protective conductor). Controllers or machine

components which are not laid out for these voltages (500 V DC)

can be disconnected from the measuring circuit for the duration

of the measurement. The measured value may not be any less

than 1 MOhm. The test can be subdivided into separate seg-

ments.

Voltage Tests (with PROFITEST 204HP/HV only)

The electrical equipment of the machine under test must with-

stand a test voltage of twice its own rated voltage value or 1000

V~ (whichever is largest) applied between the conductors of all

circuits and the protective conductor system for a period of at

least 1 second. The test voltage must have a frequency of 50 Hz,

and must be generated by a transformer with a minimum power

rating of 500 VA.

Voltage Measurement

The EN 60204 standard specifies that after switching supply

power off, residual voltage must drop to a value of 60 V or less

within 5 seconds at all accessible, active components of a

machine to which a voltage of greater that 60 V is applied during

operation.

Function Test

The machine is operated with nominal voltage and tested for cor-

rect functioning, in particular with regard to safety functions.

Special Tests

• Pulse control mode for troubleshooting (with

PROFITEST 204HP/HV only)

• Protective conductor test with 10 A test current (with

PROFITEST 204+ only)

Limit Values per DIN EN 60204, Part 1

Overvoltage Protection Device Characteristics for

Limit Value Selection for Protective Conductor Testing

Tests per DIN EN 60204, part 1

(machines)

Tests per DIN EN 61557

(systems)

Meas.

Func-

tion

Uninterrupted connection of a

protective conductor

Part 4: resistance of:

– Ground conductor

– Protective conductor

– Bonding conductor

RLO

Loop impedance Part 3: loop impedance ZL-PE

Insulation resistance Part 2: insulation resistance RISO

Voltage test

(test for absence of voltage)

——

Voltage measurement (protec-

tion against residual voltage)

Part 10: Combined measuring

equipment (amongst others for volt-

age measurement) for testing, mea-

suring or monitoring of protective

measures

Function test ——

Measurement Parameter Cross-

Section

Standard

Value

Protective conduc-

tor measurement

Test Duration 10 s

Limit value for protective

conductor resistance

based on phase conductor

cross-section and charac-

teristics of the overvoltage

protection device (calcu-

lated value)

1.5 mm²

2.5 mm²

4.0 mm²

6.0 mm²

10 mm²

16 mm²

25 mm² L

(16 mm² PE)

35 mm² L

(16 mm² PE)

50 mm² L

(25 mm² PE)

70 mm² L

(35 mm² PE)

95 mm² L

(50 mm² PE)

120 mm² L

(70 mm² PE)

500 m

400 m

300 m

200 m

100 m

050 m

Insulation resistance

measurement

Nominal voltage 500 V DC

Resistance limit value  1M

Leakage current

measurement

Leakage current 2.0 mA

Voltage measure-

ment

Discharge time 5 s

Voltage test

Test duration 1 s

Test voltage  1 kV

or 2 U

Breaking Time, Characteristics Available for Cross-Section

Fuse breaking time: 5 s All cross-sections

Fuse breaking time: 0.4 s 1.5 through 16 sq. mm

Circuit breaker, characteristic B

Ia = 5 x In – breaking time: 0.1s

1.5 through 16 sq. mm

Circuit breaker, characteristic C

Ia = 10x In – breaking time: 0.1s

1.5 through 16 sq. mm

Adjustable circuit breaker

Ia = 8 x In - break time: 0.1s

All cross-sections

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