EM TEST
UCS 500 Series
Operating Manual
V 5.40
9 / 99
2.
Safety information
Attention
Before using this equipment, read the operating manual and the
separate delivered
safety manual
carefully
2.1.
Protected Earth PE
The protective conductor connection is established via the attached power cord and must not be interrupted
under any circumstances.
DANGER
Check before connecting the power supply to the unit that the
grounding of the building supply is
installed according to regulations
.
In the absence of an earth connection can the frame can be get in the event of a fault, to the mains
voltage potential.
The generator must be properly grounded before connecting on-the EUT supply voltage to the
generator.
2.2.
FI Fault current protection
The standards recommend decoupling and filter capacitors to PE for decoupling surge pulses. This is the reason
for tripping fault current protection relays interrupt the mains to the EUT supply. For eliminate the circumstance
use one of the following options:
Remove the fault current protection
This solution does not limit the current to PE. The surge test as other EMC tests with higher currents to PE are
possible. The user must take care to the circuit with no fault current protection. Only trained professional people
are allowed to perform such tests.
Using of insulating transformers
An insulating transformer separates the circuit from the test circuit. The Fault current detector cannot detect the
earth current in the EUT circuit. The synchronization works between line and PE and therefore a connection
between neutral and PE is necessary. Without this N-PE connection the stray capacitance defines the phase
sync.
The fault current safety detection function in the generator circuit is disabled. The user must respect
this circumstance. For a safe operation he must follow the electrical rulers.
Behind the insulating transformer the neutral and PE must be connected for a proper phase synchronization of
the generator. In case of a 3-phase system the user must perform similar.
