User Manual

GMC-I Messtechnik GmbH 59

14.6 Residual Voltage Test – Ures Function (PROFITEST MXTRA only)

Applications

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.

With the PROFITEST MXTRA, testing for the absence of voltage is

performed as follows by means of a voltage measurement which

involves measuring discharge time tu:

In the case of voltage dips of greater than 5% of momentary line

voltage (within 0.7 seconds), the stopwatch is started and

momentary undervoltage is displayed as Ures after 5 seconds,

and indicated by the red UL/RL LED.

The function is ended after 30 seconds, after which Ures and tu

data can be deleted and the function can thus be restarted by

pressing the ESC key.

Connection

Limit Values

Setting Limit Values

Measuring Sequence – Long-Term Measurement

Testing is selected as a

continuous measure-

ment because residual

voltage testing is trig-

gered automatically and

voltage measurement is

always active for safety

reasons.

Note

If, for example, conductors are exposed when a machine

is switched off – e.g. if plug connectors are disengaged –

which are not protected against direct contact, maximum

allowable discharge time is 1 second!

Limit value:

ΔU % > limit value

⏐ R

ΔU