EM TEST UCS 500Mx - Test Setup: Transformer V4780; Transformer V4780 for Voltage Dips; V4780 Device Models and Control

EM TEST UCS 500 Series
Operating Manual V 3.05 45 / 57
11.5. Test setup and accessories
11.5.1. Transformer type V4780
The transformer shall be used to generate under-voltages in ac power supply systems. According to the IEC 61000-
4-11 and the EN 50081-2 voltage dips shall be generated as shown in fig. below. Different test levels are
recommended
11.5.1.1. Voltage interruptions ( DIP )
Voltage interruptions will cause a reduction of the power supply voltage for a certain period of time. Three different
test levels are required:
- Voltage dip by 100% to 0% of the nominal voltage for 10ms or. ½ period
- Voltage dip by 100% to 0% of the nominal voltage for 20ms bzw. 1 period
- Voltage dip by 60% to 40% of the nominal voltage for 200ms bzw. 10 periods
- Voltage dip by 30% to 70% of the nominal voltage for 500ms bzw. 25 periods
- Voltage dip by 20% to 80% of the nominal voltage for 5000ms bzw. 250 periods
Standard voltage dips V 4780 S2 with automatic tap control
The transformator is an accessory to the following devices
- UCS 500Mx, PFS 500
11.5.1.2. Device models V 4780
V4780 250V 16A, manual control
V4780 S1 250V 16 A manual control additional tap at 120%
V4780 S2 250V 16A, automatic control
V4780 S3 250V/32A, manual control
11.5.1.3. Control V4780 S2
The V4780 S2 is controlled through the analogue input ( 0...10Vdc ). The electronic switch the related tap, 40%,
70% oder 80%, proportional to the applied dc reference voltage ( 0...10V dc ) to the output PF2.
Is the reference dc voltage out of the tolerance (± 0.25V), the electronic will not switch any tap to the PF2 output.
Operating with ramps the electronic will not select a tap, if the ramp ( 0-100% ) is shorter than approx. 4s.
Programming longer ramptimes, each tap will switch on and off when the reference is in the valid range.
Voltage taps
DC reference voltage
80% von Unenn
8.00V ± 0.25V
70%
7.00V ± 0.25V
40%
4.00V ± 0.25V