Atec VDS-2002 User Manual

Voltage dips, also called sags, are brief reductions in AC mains voltage, typically between half a cycle to a few seconds. The best-known sources of voltage dips and interruptions are listed below:
heater.
Loose or defective wiring such as insufficiently tightened
box screws on mains conductors leading to the increase of your system impedance, thus, making itself vulnerable to the effect of current increase.
Faults or short circuits draw excessive currents until the
protective devices such as a fuse or circuit breaker operates.
Faults on distant circuit typically which can be automatically
switched and removed by reclosers. This type of event is sometimes a series of voltage dips caused by continuous operation of reclosers.
Loads that have continuously varying power levels cause
voltage variations rather than an abrupt change.
In any case, these voltage changes can degrade the performance of electronic equipment in many different ways: digital circuit upset, data-loss or distortion and so on. Therefore, immunity testing for these types of events should be performed to ensure your product's safe and reliable operation.
In fact, in the scheme of international compliance, the IEC 61000-4-11 compliance voltage dip test is a must for all products having a rated input current not exceeding 16A per phase.
Clearly from the above, voltage dips, interruptions, and variations are everywhere and unavoidable.
Voltage dips and short interruptions are not always abrupt because of the reaction time of rotating machines and protection elements- the rotating machines will operate as generators sending power into the network. Some equipment, typically containing a power-fail detection circuit, is more vulnerable to gradual variations than to abrupt change.
The NoiseKen VDS-2002 Voltage Dip and Up Simulator, uncompromising on and fully compliant with all the test generator requirements in the standard including fast rise and fall times, peak inrush current drive capability, overshoot/undershoot and others, fulfills accurate testing needs.
VDS-2002 Voltage Dip and Up Simulator
FEATURES
Fully compliant with all the test generator requirements of IEC standard
One unit solution for dip, swell, interruption, and variation tests up to 16A 290V single phase AC
Interruption test up to 16A 125V DC*
Two motor-driven transformers approach enables switching between any voltages*
Preset IEC test levels 0%/40%/70% additional 120%
Two modes for 0% (interruption) test: open & short*
Optional Windows Application Software available to more extensively control the unit
Accurate waveforms
* Optional software required
CONTROL PANEL
EUT OUTPUT:
receptacles (Multi-type) +Terminal Blocks for AC/DC.
TEST LEVEL:
selects a test level among 0, 40, 70 and 120%.
DIP CYCLES:
selects the duration of a dip among 0.5, 1, 5, 10, 25 and 50 cycles.
DIP PHASE:
selects the phase angle at which a dip starts among 0, 45, 90, 135, 180, 225, 270 and 315 degrees.
INTERVAL CYCLES:
selects the time interval between each dip among 1, 3, 5, 10, 30, 50, 100, 300, 500 cycles and 10s.
REPEAT COUNT:
selects the number of dips among 1, 3, 5, 10, 30, 50, 100 and infinite.
MEMORY NUMBER:
used to save or call up the selected test setting among preset 5 settings
LINE: turns on and off power to the EUT
SW1:
for output verification, the unit outputs the normal voltage adjusted by the slide transformer 1.
SW2:
for output verification, the unit outputs the dip/swell voltages adjusted by the slider transformer 2.
START: starts the test.
STOP: stops the test.
VDS-2002 Voltage Dip and Up Simulator
ELECTRICAL SCHEMATIC
OPERATING PRINCIPLE
As shown in the above schematic, the VDS employs two independent motor-driven slide transformers and two IGBT switches. Under complete control by the unit control circuitry, it generates voltages dips, interruptions and variations with much wider parameter settings than those originally required in the IEC 61000-4-11 standard.
Since the unit employs two slide transformers, it can generate two variable voltage levels, which are independently preset, corresponding to dip (or variation) and normal voltage (voltage in interval cycles). The two IGBT switches enable to fulfill the fast rise and fall time requirements called for in the relevant standard.
AC/DC selection terminals are provided to insert the two transformers for an AC test and to bypass them for the DC test. DC interruption test, therefore, can be done by utilizing the same IGBT switches.
To offer short and open mode selection in AC interruption test, two magnet relays, MG22 and MG21, work to realize low impedance and high impedance as seen from the load side.
VDS-2002 Voltage Dip and Up Simulator
SPECIFICATIONS
Parameters
Compliant standard Number of lines Test mode
Input voltage range
Output voltage range
Output VA Output current capability
Peak inrush current drive capability Load regulation
Overshoot/undershoot Rise time/fall time Normal voltage setting
Dip/Swell level
Repetition of events
Interval cycle
Dip cycle
Dip phase (Starting phase angle of events)
Voltage variation test
Memory
Equipment input
Interruption AC/DC
Dip and swell
Var iat io n
AC
DC AC100~120V AC220~240V 100% of input voltage 0~16A rms 70% of input voltage 0~23A rms 100% of input voltage 0~40A rms
Setting by percent
Setting by voltage Accuracy Setting by percent
Setting by voltage
Accuracy No. of events
Setting by cycle
Setting by time
Setting by cycle
Setting by time
Setting by phase angle
Setting by time
Setting by time
Test level
100% of input voltage 70% of input voltage 40% of input voltage
Specifications Remarks
IEC 61000-4-11 Single phase Synchronous Short circuit Asynchronous Synchronous/Asyn chronous Synchronous Asynchronous Asynchronous
AC90~264V, 50/60 Hz DC0~125V AC0V~120% of input voltage DC0V~input voltage
4.224kVA 16A rms 23A rms 40A rms 16A
250A500A5%
7%
10%
5%
PC Local PC
PC
Local
PC
PC Local Synchronous
Setting for short duration
Setting for long duration
Setting for short duration Setting for long duration
Changing time
Changed time Interval
AC100~115V/200~240V10%, 50/60Hz, 120VA optical RS-232External interface 15~35쎶COperating temperature 25~75%R.H. (No dewing)Operating humidity (W)430҂(H)745҂(D)600mm(projection excluded)Dimensions Approx.150 kgs.Weight
1~5애S ~120% 100% 10V~290V
(interruption)
(interruption) setting Short/Open selectable for 0V (interruption) 5V 1~1000 or continuous 1, 3, 5, 10, 30, 50, 100 or continuous PC Local Synchronous Asynchronous
Asynchronous
Synchronous
Synchronous Asynchronous Asynchronous
Synchronous
Asynchronous
PC/local PC PC
PC/local PC PC/Local Only 2s-1s-2s standard defined test available in local mode
0.5~5000.5 cycles 1,3,5,10,30,50,100,300,500 cycles, 10s 1~100s
PC
10ms~100s (50Hz)
8.3ms~100s (60Hz) 1s~10h
0.01~5000 cycles
PC
0.5, 1, 5, 10, 25, 50 cycles
Local
0.1 ms~100s
PC
0.1 ms~100s 1s~10h
0~359
PC Local
0, 45, 90, 135, 180, 225, 270, 315
0~19.9 ms for 50Hz
PC
0~16.6 ms for 60Hz
PC
0.1s~10 s at least 0.1s required for 10% change of input 0~10s 0~100s 0~120%
PC Local
5 tests
PC
10 steps
Open circuit
0~120%Short/Open selectable for 0%
0/40/70/120%Short circuit for 0%
0~290V (0~120%
AC290V max
Continuous Continuous
5S5S
Continuous at 100% output, 10ms
100 ohm loaded 100 ohm loaded 10V minimum
5V step 0V~16A output앧5V
4 steps
)
5V step
1 event step 8 steps
0.5 cycle step 10 steps 1s step
0.1 ms step
1s step
0.01 cycle step 6 steps
0.1ms step
0.1ms step 1s step
1 step 8 steps (45 degrees step)
0.1ms step
0.1s step
0.1s step
0.1s step
Test sequence stored up to 10 steps when controlled by PC
VDS-2002 Voltage Dip and Up Simulator
IEC 61000-4-11 Standard/Voltage Dips, Short Interruptions and Variations
Test levels
Test Level
%U
T
0
Voltage dip and
short interruptions
%U
T
100
Duration
(in perriod)
0.5 1
Test Level
%U
T
40%U
T
Time for
decreasing
voltage
2s20%
Time at
reduced
voltage
20%
1s
Time for
increasing
voltage
20%
2s
5
40
60
10
0%U
2s
T
20%
1s
20%
2s
20%
25
70
30
The voltages in this standard use the rated voltage for the equipment (U
50
x
xxx
) as a basis for voltage test level specifications. If the
T
equipment has a specified input voltage range, then testing should be performed at the lower and upper limits of the voltage range specified. However, in practice it is only necessary to perform the tests at the lowest specified input voltage, since all the tests concern a reduction or interruption of supply voltages. "X" is an open duration. One or more of the above test levels and durations may be chosen.
IEC61000-4-11 is a basic EMC standard defining test generator, methods and others and does not specify particular test levels and durations, but it is the Generic Immunity standards, as well as the Product family standards, that specify the test revel and pass/fail performance criteria applied to a particular class of equipment.
For an open set of duration, the IEC standard says other values may be taken in a justified case and shall be specified in product specifications. For possible future requirements, VDS-2002 has provisions of a variable slew rate from 1s to 10s (0~100% output)
Characteristics of the test generator Peak inrush current drive capability (not required for voltage variation tests)
500A for 220V-240V mains 250A for 100V-120V mains
The test generator has to simulate the very low output impedance characteristics of the real world mains. In other words, the generator must be able to provide inrush currents of a similar level to the actual power mains.
Most electronic products such as those using switching power supplies exhibit high start up currents needed to charge capacitive input circuitry in their input section. Conventional AC amplifiers cannot meet this requirement, and worse yet, they perform as external soft-start circuits for the EUT. For verifications, the generator shall be switched from 0% to 100% of full output, when driving a load consisting of an uncharged capacitor whose value is 1700
F in series with a suitable rectifier. A bleeder resistor in a range of
100 ohm to 10k ohm shall be connected in parallel with the capacitor. Several time constants must be allowed between tests. The standard specifies the current monitor's characteristics used to measure peak inrush current capability.
Overshoot/Undershoot (loaded with 100 ohms) : Voltage rise/fall time (for abrupt change, generator loaded with 100 ohms): 1 to 5
5%
s. Conventional AC amplifiers cannot meet
this requirement
Phase shifting: 0 to 360
Execution of test
3 dips/interruptions/variations with interval of 10s minimum Abrupt change in supply voltage shall occur at zero crossing of the voltage.Additional angles (45, 90, 135, 180, 225, 270, 315
)are
specified for use by product committees or individual product specifications. The IEC standard requires the monitoring of EUT line voltage within a accuracy of 2%.ALM-21 is suitable for this purpose with its
logging capability. This power Line Monitor also can monitor the VDS output voltages. ALM-21 accuracy:
(0.5% rdg0.8V)
VDS-2002 Voltage Dip and Up Simulator
OPTIONAL ACCESSORIES
Control Software Model 14-00029A
Wider parameter settings than locally allowed
Setting to IEC 61000-4-11 are preprogrammed
Intuitive setting for all test parameters
GUI (graphical user interface)
Sequential operation up to 10 steps
Test report generation
RS232C Optlink set Model 07-00017A
Main Window
IEC Test
AC Dip Test
AC Variation Test
DC Interruption Test
AC Line Monitor Model ALM-21
The IEC 61000-4-11 requires monitoring of the main voltage for testing (voltage to AC EUT INPUT) within an accuracy of 2%. A compact, portable AC Line Monitor ALM-21, originally intended for site surveys, is suitable for this purpose with its data logging capability. It also can monitor the output from the VDS-2002.
Designs and specifications are subject to change without notice.
NOISE LABORATORY CO., LTD.
1-4-4, Chiyoda, Sagamihara City, Kanagawa Pref., 229-0037 Japan
81
(0)
42-712-2051 Fax: 81(0)42-712-2050
0208-05K
Tel: http://www.noiseken.com/ E-mail: sales@noiseken.com
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