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EM TEST
5.
Operation
5.1.
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.
5.2.
Synchronization
The transients generally must be related to a certain phase angle of the power supply. This is required for the surge
test and optional for the burst test.
The synchronization is normally realized within the VCS, the EFT and the UCS generator and is related to the power
supply input at the rear of the equipment, to phase L or the "Sync" input at the rear panel of the generator.
Then when using external 3ph couplers the generator itself has no power mains supply connected to the input for the
EUT supply at the rear panel.
NOTE: The hardware is designed to
Phase synchronization angle in star-delta 3-phase system
The Generator synchronizes between the connected Phase Lx to PE. In a 3-phase system
the PE and Neutral are connected together at the supplier's transformer. The pulse
generator is designed for a 3-phase system in star mode (L1, L2, L3, N, PE).
Then the synchronization in a 3-phase system is perfect for a 3-phase equipment with star
connection. For 3-phase equipment with delta connection the shift the phase angle for
triggering must be adjusted. The graphic in Figure 5.1 shows the different phase angle
between connection L1-N (star-) and L1-L2 (delta mode).
The generator manual describes the method of the phase angle setting of the generator.
Using a UCS 500N type
The synchronization is realized within the UCS generator and is related to the sync input at the rear of the UCS 500...
Then when using three phase couplers the UCS has no power at the sync input
Connect sync input of the UCS 500 to the phase L1 of the coupling network with. The UCS synchronizes to
this phase L1.
The sync input of the UCS 500 is referenced to ground (PE). The phase synchronization depends from
the Firmware version and is different.
Important information to the synchronization you can find into the UCS manual
Using a VCS 500 or EFT 500
The synchronization is realized within the VCS 500 or EFT 500 / 800 generators and is related to the power supply
input at the rear of the equipment, to phase L input.
Then when use three phase couplers, the generators have no power supply at the input for the EUT.
Connect phase L1 and neutral N of the power supply input of the coupling network with phase L and
neutral N at the input of the VCS, or EFT. The generator is synchronized to the phase connected at the
input L. Dependant on which phase, L1, L2 or L3 is connected to the generators; the transients are
synchronized to this line.
Connecting two devices VCS 500 and EFT 500 series on CNI network
In case that a Surge generator (VCS 500 series) and a Burst generator (EFT 500 series) are connected
simultaneously, both generators must be switched on. Otherwise the coupling modes might be set false.
Manual of operation
synchronize
the connected reference phase
V 3.32
CNI 501 / CNI 503
L to
PE.
Figure 5.1 Phase shift
between star and delta
17 / 41
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