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EM TEST
UCS 500 Series
Operating Manual
V 5.40
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11.7. Test setup and accessories
11.7.1.
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
11.7.1.1.
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 respectively 1 period
- Voltage dip by 60% to 40% of the nominal voltage for 200ms respectively 10 periods
- Voltage dip by 30% to 70% of the nominal voltage for 500Ns respectively 25 periods
- Voltage dip by 20% to 80% of the nominal voltage for 5000ms respectively 250 periods
Standard voltage dips
V 4780 S2 with automatic tap control
The transformer is an accessory to the following devices
- UCS 500Nx, PFS 500
11.7.1.2.
Device models V 4780
V4780
250V 16A, manual control
V4780 S1
250V 16A manual control
additional tap at 120%
V4780 S2
250V 16A, automatic control
V4780 S3
250V 32A, manual control
11.7.1.3.
Control V4780 S2
The V4780 S2 is controlled through the analogue input (0...10Vdc). The control circuit switches to the related tap,
40%, 70% or 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 control will not switch to any tap to the PF2 output.
Operating with ramps the control circuit will not select a tap, if the ramp (0-100%) is shorter than approx. 4s.
Programming longer ramps, each tap will switch on and off when the reference is in the valid range.
Voltage taps
DC reference voltage
80% of Unom
8.00V
0.25V
70%
7.00V
0.25V
40%
4.00V
0.25V
Settings on UCS for V4780 S2
The UCS must be matched to the 0-10V input of the V4780. Therefore a
V4780 must be configured as a motor
variac.
For setting
V and Vn must set to the same value in menu
“Setup Main Voltage to high”
which is the
value of the voltage of your power supply.
Setup:
F7
- Service/
F3
-Setup/
F6
Set voltage low/high/
F2
Setup Main Voltage to high
230V
Settings
V
Vn
CH
Example for 230V mains
230V
230V
1
Example for 100V mains
100V
100V
1
The Motorvariac must be operated in
F3
Motorvariac high
(control voltage DC out= 0-10V)