GMC-I Messtechnik GmbH
5
The test adapter may not be used:
•
If external damage is apparent, for exam-
ple if parts which conduct dangerous
touch voltage are freely accessible,
if its LEDs are defective (voltage at the
PRCD IN
would no longer be indicated in
this case)
•
If the seal or sealing lacquer has been
removed as the result of repairs or
manipulation carried out by a non-autho-
rized/certified service provider
•
With damaged connection and/or mea-
surement cables, e.g. interrupted insula-
tion or kinked cable
•
If it no longer functions flawlessly
•
After extraordinary stressing due to transport
In such cases, the test adapter must be
removed from operation and secured
against unintentional use.
2
Applications
Testing of PRCDs with the Test Adapter by
Simulating Faults
The following faults can be simulated with
regard to mains supply power to the PRCD:
•
Wire reversals
•
Failure of individual conductors
(undervoltage detection)
•
Interference voltage on the protective
conductor
a) by connecting the phase conductor
to the protective conductor
(
PE-U
EXT
switch setting) or
b) by touching the “on” key of the
single-phase PRCDs with the probe
The evaluation of the PRCD’s reaction to
each respective fault is strictly visual:
•
PRCD active or inactive
(indicator lamp on the PRCD)
•
Fault indication by means of LEDs on the
test adapter
Attention!
!
In any case, comply with the manu-
facturer’s recommendations con-
cerning tests to be conducted in
accordance with DGUV Provision 3.
Testing of PRCDs with the Test Adapter by Simu-
lating Faults and Measuring Protective Conductor
and Insulation Resistance, as well as Tripping
Current and Time to Trip, using the PROFITEST
MXTRA Test Instrument
The following functions are possible after
connecting the
PROFITEST MXTRA
test instru-
ment to the test adapter:
•
There are three preset test sequences:
Single-phase PRCDs:
– PRCD-S: 11 test steps
– PRCD-K: 4 test steps
3-phase PRCDs:
– PRCD-S: 18 test steps
•
The test instrument runs through all test
steps semi-automatically:
Single-phase PRCDs: 10 test steps
3-phase PRCDs: 17 test steps
•
Each test step is evaluated and
assessed by the user (go/no-go) for later
documentation.
•
Measurement of the PRCD’s protective
conductor resistance using the test
instrument’s R
LO
function. Please note
that the protective conductor measure-
ment is a modified RLO measurement
with ramp sequence for PRCDs, which is
only available with the
PROFITEST MXTRA
test instrument.
•
Measurement of the PRCD’s insulation
resistance using the test instrument’s
R
ISO
function.
•
Tripping test with nominal residual cur-
rent using the test instrument’s I
F
function.
•
Measurement of time to trip using the
test instrument’s I
Δ
N
function.
•
Varistor test for PRCD-K:
Measurement via ISO ramp
PROFI
TEST
⏐
P
RCD
Applications