Bedienungsanleitung Gossen Metrawatt METRISO PRIME plus (Seite 11 von 68) (Englisch)

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GMC-I Messtechnik GmbH 11

Opening of Equipment / Repair

The equipment may be opened only by authorized service per-

sonnel to ensure the safe and correct operation of the equipment

and to keep the warranty valid. Even original spare parts may be

installed only by authorized service personnel.

In case the equipment was opened by unauthorized personnel,

no warranty regarding personal safety, measurement accuracy,

conformity with applicable safety measures or any consequential

damage is granted by the manufacturer.

2.1 Checklist for High-Voltage Tests

Attention!

Measurements may not be performed under moist ambi-

ent conditions, where condensation has occurred or in

explosive atmospheres.

Personnel Safety

Ð Turn the machine under test off and lock it in the off position.

Ð Perform insulation resistance measurement.

Ð Make sure that the system is grounded.

Ð Secure the danger zone with barriers, closing even narrow en-

trance ways.

Ð Set up warning signs such that they are plainly visible.

Ð Set up warning lamps such that they are plainly visible.

Ð Attach the emergency stop button in a plainly visible fashion.

Ð Warn personnel working in the area of possible danger.

Ð Always turn the test instrument off with the key switch and re-

move the key before leaving the work area.

Safety Precautions for the Machine Under Test (recommended)

Review the circuit diagrams and make a note of all electrical circuits.

Ð Disconnect the neutral conductor from the mains.

Ð Short circuit each electrical circuit to itself.

Ð Disconnect control circuits with overvoltage arresters, if the ar-

resters would be triggered by utilized test voltage.

Ð Disconnect PELV circuits (no high-voltage testing is required

for these circuits).

Ð Test insulation at each circuit with 1000 V.

(If insulation resistance is OK at 1000 V, no failures should

occur during the high-voltage test.)

Ð Disconnect frequency converters.

Ð Caution in TN systems!

The protective conductor is connected to the neutral conduc-

tor in the junction box. High-voltage is thus applied between

the phase conductors and the neutral conductor.

The neutral conductor must be cut if necessary, because it is

not disconnected from the mains by means of fuses.

Setting Up the Test Instrument

High-Voltage Test

Test all circuits (conductors) against the protective conductor (all

switches in the mains circuit must be turned on, and testing must be

performed upstream and downstream from all relays and contactors).

Ð Remove all shorting devices after testing has been completed.

Testing Without Short-Circuiting

Ð Separately test all conductors from all circuits against the pro-

tective conductor (the machine could be damaged in the case

of arc-over).

Functions Test

Ð The machine must be tested for correct functioning after the

high-voltage test, especially as regards safety functions.

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