38
TGH1266E -
05/04
Practical Use
Using the EDS165 as
a Residual
Current Monitor
The EDS165 can also be used without the PGH185 test device as a residual current measuring
device in TN and TT systems, and provided that certain system conditions are fulfilled, it can also
operate in IT systems. The residual current measurement is only possible in ‘live’ systems.
•
Test whether the system is ‘live’.
•
Connect the Clamp-on Probe.
•
Move the operating mode selector switch on the EDS165 to position I
∆
n
, and wait until
the basic menu appears on the display.
•
Check whether the correct Clamp-on Probe is set in menu 4 (m4 - set sensor). The
factory setting is Clamp-on Probe PSA3052.
•
Check whether an operating value (I
∆
n
= XX mA) has been set which is suitable for
practical purposes. The factory setting is a response value of 100 mA.
•
Start measurement at a suitable position in the system. When you do this, start as near
to the supply as possible and move on radially in the direction of the consumers.
•
During the measurement, the clamp-on probe must be held still. The conductors
should be encircled as symmetrically as possible. Make sure that you do not exert any
pressure on the arms of the clamp-on probe.
•
During the measurement, encircle all the system conductors,
but not the PE
. Do not
encircle any shielded leads.
•
When the clamp-on probe is encircling ‘live’ conductors, it must not be disconnected
from the EDS165. In this type of ‘open’ operation, the clamp-on probe may be
destroyed!
•
The residual current at each measuring point is shown on the display. If the residual
current is greater than the set response value, an acoustic signal will also be given
provided that the buzzer is activated.
For extended period measurements at one point of the system, the fault memory must be
activated (‘memory on’) in menu 2 (m2 - memory). In this way, it is also possible to find
intermittent residual currents, provided that they are higher than the set response value.
The highest measured residual current is stored
