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Functions
7.7 Individual tests
The device uses a digital potentiometer to realise the load of the welding device. The load starts
as soon as at least half of the limit of the welding voltage has been reached. The load duration
is 3 seconds.
The device measures the AC or DC welding voltage, the peak value of the welding voltage and
the welding current between the two poles.
7.7.11
Contact current of the welding circuit
Class I
-
The contact current of the welding circuit is tested to check for compliance with the rated values
of devices according to VDE 0544‑4 [} page 94].
For this purpose, the following measuring methods may be used:
• Direct current measuring method (direct measuring method)
• Differential current measuring method
• Alternative leakage current measuring method
7.7.12
PRCD
Class I
X
A portable residual current protection device (PRCD) provides protection against hazardous
body currents in the downstream circuit in case of direct contact. The rated value for the tripping
fault current is max. 30 mA [} page 95].
The device provides an automatic test procedure [} page 104] for each PRCD type. The
PRCD test includes the following tests and measurements:
PRCD
type
Tripping type
Tests
Tripping current at
0° and 180°
Tripping times
V
Cont
Tapping the TRIP
key
Interrupting the
L conductor
Interrupting the
N conductor
Interrupting the
PE conductor
5284 / 08/2023 en
EN 50678 (VDE 0701)
EN 50699 (VDE 0702)
Class II
Class III
-
EN 50678 (VDE 0701)
EN 50699 (VDE 0702)
Class II
Class III
-
A
F
AC /
pulsating
direct currents
X
X
X
X
X
X
X
X
BENNING ST 755+ / ST 760+
EN 62353
(VDE 0751‑1)
Class I
Class II
-
-
EN 62353
(VDE 0751‑1)
Class I
Class II
-
-
B
B+
K
DC /
universal
current-
sensitive
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
EN 60974‑4
(VDE 0544‑4)
Class I
-
X
EN 60974‑4
(VDE 0544‑4)
Class I
-
-
S
S+
AC
2-pin
AC
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Class II
X
Class II
-
3-pin
X
X
X
X
X
X
X
47
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