EM TEST
UCS 500 Series
Operating Manual
V 3.05
43 / 57
11.3.
The Power Fail Test
The generator type UCS 500 M4/M6/M6A simulates the following interference :
- Voltage dips
- Voltage interruptions
- Voltage variations
- Inverse
11.3.1.
Voltage Interruptions
Depending on the preselected test parameters at the front panel of the simulator the power supply for the EUT is
interrupted for a certain time and at a certain phase angle (AC power supplies).
The power supply for the EUT is connected at the rear part of the
simulator to channel PF1 or PF2. The same channel must be
preselected at the front panel of the simulator.
The power supply may be taken directly from the mains power
supply or from a separate voltage source. Mostly used for this
tests are motor driven variacs
Power fail tests are normally carried out at a nominal voltage and
at maximum tolerance under-voltage.
The nominal voltage may be connected to PF1 and the reduced
dip voltage to PF2.
The power fail test may be carried out in various operating modes:
High impedance interruptions
If mode PF1 or PF2 is preselected the EUT supply is interrupted
at the respective channel by the electronic switch. The EUT must
discharge itself internally.
Low impedance interruptions
The EUT supply is connected to PF1. The channel PF2 is short-
circuited (L-N). By selecting the operating mode
∆
U the EUT
supply is disconnected by the electronic switch of PF1 and the
EUT will be discharged into a low impedance via the electronic
switch of PF2
