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Benning ST 725 Manual

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01/ 2015
BENNING ST 725
37
or
- Connect the portable RCD (PRCD) to the test socket
1
of the BENNING ST 725.
- Connect the IEC power cord included in the scope of delivery to the IEC connector J of the
BENNING ST 725 and connect the shock-proof plug to the portable RCD (PRCD) as shown
in figure 7b. The cable outlet must point towards the display!
- Press the -key
6
to switch the mains voltage to the test socket
1
. The "rCd" and "rESEt"
symbols are shown on the display.
- Switch the portable RCD (PRCD) on.
- If the "rESET" symbol is still shown on the display and the "LN" and "LE" symbols are
flashing, please verify whether the portable RCD (PRCD) is switched on. If it is switched on,
turn the shock-proof plug of the IEC power cord in the portable RCD (PRCD) by 180° and
start the test again.
-
Whenever the "rESEt" symbol appears on the display, switch the portable RCD (PRCD) on again.
- The BENNING ST 725 generates a fault current of 30 mA with positive (0°) or negative
(180°) initial polarity. The portable RCD (PRCD) trips and the tripping times of the one-fold
nominal fault current are measured.
- If the tripping time is less than the limiting value (200 ms), a will be shown next to the
tripping time.
- Subsequently, the BENNING ST 725 generates a fault current of 150 mA with positive (0°) or
negative (180°) initial polarity. The portable RCD (PRCD) trips and the tripping times of the
five-fold nominal fault current are measured.
- If the tripping time is less than the limiting value (40 ms), a will be shown next to the
tripping time.
- The test is considered to be passed, if "PASS" is shown on the display.
Note:
Some portable PRCD types (e.g. PRCD-S, PRCD-K) switch off L, N and PE on all poles so that
the BENNING ST 725 does not detect any connection between the IEC connector J and the
test socket
1
. Testing of these PRCD types must be carried out according to chapter 9.5.1 "Test-
ing of permanently installed RCDs" by connecting the portable RCD (PRCD) to a mains socket
which is not protected by another RCD.
Seegure8b: TestingofportablePRCDs(I
ΔN
=30mA)
10. Measured value memory
The BENNING ST 725 is equipped with a measured value memory to store the measured values
of 999 test objects.
10.1 Storing measured values
- As soon as the test sequence is completed and the test result is available, press the -key
to store the displayed measured values to the first free storage location. The storage will
be confirmed by the "STORE" symbol and the storage location number shown on the display
8
. The -key will be blocked until another test is carried out in order to prevent double
storage. With each new storage, the storage location number will be increased automatically
by one storage location. As soon as all 999 storage locations are occupied, the "FULL"
symbol will be shown on the display
8
.
… 46 …


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