Manual

Table Of Contents
88 Gossen Metrawatt GmbH
19.6 Residual Voltage Test – U
res
Function (PROFITEST MXTRA
only)
Application
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 than 60 V is applied during
operation.
Testing for the absence of voltage is performed as follows with the
test instrument by means of a voltage measurement which
involves the measurement of discharge time:
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 U
res
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
Set 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.
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
permissible discharge time is 1 second!
Limit Value:
U % > Limit Value
U
L
R
L
U