EM TEST
coupling NX
Manual of operation
V 1.03
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8.
Operation
8.1.
Power supply input (EUT)
The power supply input for the EUT is located at the rear side of the coupler. Adapters for customized three phase
connectors have to be realized by the user himself or can be manufactured on
customer’s specification.
The output of the power mains supply (surged lines) for the EUT is located at the front panel of the equipment.
8.2.
Synchronization
The synchronization signal for trigger the Surge and optional Burst impulse is generated in the three phase coupler.
The NX generator receive the sync signal from the coupling NX via the sys.link cable.
The synchronization signal is taken from the coupler internal lines
L1 - N
. Alternative the phase synchronization can
be connected to the SYNC IN plugs at the rear side of the compact NX generator.
Phase synchronization angle in star-delta 3-phase system
The synchronization in a 3-phase coupler system is taken between
L1
– N
lines.
In case of a delta supply without connected neutral line, an artificial high impedance
network defines the neutral point. This artificial neutral is taken for the phase
synchronization.
For all couplings the generator calculates the correct phase angle for phase
triggering.
The tables below shows the correction angels considering the phase in a 3-phase
system with synchronization signal from L1-N lines. The generator firmware will
automatically add the correction angle to the settled value.
Figure 8.1
Phase Synchronization correction for L1-N as sync signal
Sync.
Source
Correction angel added by the compact NX firmware
Coupling
L1-N
L1-N
L2-N
L3-N
L1-L2
L1-L3
L2-L3
Sync.-
Angel
0°
0°
120°
240°
330°
30°
90°
90°
0°
210°
300°
60°
120°
180°
180°
0°
300°
30°
150°
210°
270°
270°
0°
30°
150°
240°
300°
0°
The correct phase angle will be set automatically from the compact NX5.
Summary of Contents for coupling NX series
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