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PWM-IGBT Based Static Stabilizer
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Voltage Stabilizer (Servo Controlled)

The wider use of equipment with non linear absorption such as rectifiers, speed variators, drives, switching power supplies, has caused, besides traditional and well known voltage fluctuations, the spreading of a new insidious type of electrical fault: harmonic distortion.

Companies producing electric energy generate the correct voltage. However, failures on the line, atmospheric conditions, continual load variations and disturbances generated by the actual users make it impossible to guarantee every user a steady voltage within the tolerance bandwidth stipulated in the supply contract.

'Suvik' series of electrodynamic voltage stabilizers offer a reliable and tested economic solution to inconveniences caused by voltage fluctuation. To use 'Suvik' SCVR is a real investment because the elimination of the inconveniences means a reduction in costs and an increase in productivity. Very often it is only necessary to avoid a few minutes machine downtime or just one failure to repay the cost of the stabilizers. 'Suvik' SCVRs are particularly suitable for applications that require:

  • High reliability
  • Capability to compensate wide mains voltage variations
  • High precision of stabilized voltage
  • Stabilizing of high power services
  • Simple and limited maintenance
  • Networking

'Suvik' SCVR's regulate through a series transformer. A micro based control circuit drives the variable autotransformer that supplies the required voltage to the series transformer either in phase or phase opposition to bring the mains to the rated value.

The three-phase stabilisers are available in two versions:

  • Balanced Load models which regulate on the average of the three phases and are therefore suitable for balanced lines or for a maximum load unbalance between the phases of 50%.
  • Unbalanced Load models that, having three separate control circuits, individually regulate each phase and are therefore suitable for unbalanced lines and load unbalance between phases up to 100% phase opposition to bring the mains to the value.


Difference between Analog and Digital Servo Stabilizer (Download - Tech Pavilion PTR 007)

Sr. No Digital SCVS Analog SCVS Digital Feature Advantage
1 Microchip controller as heart of control board, 20X4 LCD for runtime electrical parameter display and metering Separate Analog / Digital meter needs for metering Higher reliability and performance, easy for user to monitor all parameters and fault details to take preventive actions
2 Front panel control for parameter setting Factory set, can’t change Easy to change output parameter as per customer need
3 Intelligent enough to control overload based on system KVA rating Factory set only System will not be allowed more than system power rating other than set overload setting. System and load can be saved from hazard
4 Output voltage upper and lower cutoff based on output set value Factory set only Load will be always safe from the output over voltage  in case of  change in set output voltage, controller itself will take min/max threshold value
5 Individual message for each fault Common indication for any fault Easy for user to recognize unhealthy status of servo or load. User can take preventive action based on this indication
6 Single board for control and conditioning Separate board for control and conditioning Less component count and board to reduce failure probability
7 On board buzzer External buzzer with complex hardware logic User will get buzzer for all kinds of faults to recognize system status without visualizing
8 Buzzer control from front panel No control User can control the buzzer as per their need
9 Easy for wiring and maintenance Complex than Digital control Reduced wiring will increase reliability in the system, lesser probability of failure or malfunction
10 Fault history storage capability for all faults, can store No. of faults occurred during operation No history This is great feature of Digital controller, user will always be aware with load performance input line conditioning. User himself can take preventive actions. This will reduce time to repair system.
11 Can store absolute maximum voltage and current parameters to take preventive action No such record This will provide correct information of how much maximum voltage and load current can be sustained by the system. From this preventive action can be taken for the load
12 SCVS ON / OFF control through Front panel soft key for maintenance Separate hardware for manual operation User can start and stop output without switch on and off input supply, can do maintenance from line side
13 Independent output control through single board, no separate card required for cutoff, phase sequence error Three different control and cutoff card required to achieve this requirement Less component count and board to reduce failure probability
14 RS232 / 485 serial communication with auto baud rate feature for remote configuration as well as monitoring. Can make SCVS on and off as well as can get all system status and history from remote place No such PC communication User can check status of the servo from the PC itself and need not go to servo and check the parameters. With RS485 more than one system parameters can be checked in PC. User can start and stop servo from the PC itself. This will generate system status and fault history report to understand line and load voltage behavior
15 System in manual mode alarm message in case the system is bypassed through digital control No This feature will help user to remind system is in manual mode, by mistake if user forgets to change from manual to auto mode system will not regulate respected line output and can damage load
16 Carbon loss indication for easy preventive action and maintenance No User will come to know that carbon brush has damaged (this will lead system output to be very high voltage) and can ask for early preventive action, load will be safe in case of carbon failure.
17 Can set SCVS Sr. No. and commission date information for easy maintenance No User can check system history  like Sr. No.,  installation date and ask for preventive maintenance

Unique Features

SUVIK has developed state of art DSPIC based controller to stabilize utility voltage. Apart from its standard feature it has following unique features to improve reliability, serviceability and reduce system down time.

  • Energy meter with RTC (Optional)
    Provides accurate Energy Consumption (Kwh) data with Real Time Clock. Also provides useful data like KVA, KW and Power factor. Compatible with Suvik servo-control cards and so that all the energy related data can be seen on the same display where servo-voltage stabilizer data are being displayed.
  • Variac protection
    Utility voltage levels are very dynamic and change over time is unpredictable. Higher voltage can generate catastrophic failure in SCVR (mainly Variac) which impacts on higher down time . This feature isolates the VARIAC whenever voltage goes high at cutoff limit and restores the same once utility voltage comes back to normal range.
  • Carbon brush failure protection
    Carbon brush failure is frequent phenomena due to wear and tear. This failure results in higher down time or uncontrolled voltage to machines. Suvik has developed algorithm to detect carbon brush loss. This feature helps user to take preventive action to reduce down time and MTTR.
  • Sensor less voltage feedback
    Sensor less control reduces probability of sensing transformer failure and increase system reliability. SUVIK's DSPIC based controller does not use any sensing transformer to sense the input and output voltage. Faster feedback and sensing due to software filter and algorithm inside DSPIC increases system response.
  • Real Time Clock (RTC)
    Helps to log event occurrence (e.g. over voltage, under voltage, over load) along with date & time, which can be viewed later on. This information along with equipment down time / up time can be helpful to analyze various data like, down time for maintenance, production rate, and fault analysis.
 

RS232 / RS485 Communication for SVK Servo Controller of Suvik Digital Stabilizer (Download - Tech Pavilion PTR 008)

Product Overview
Suvik Servo controlled voltage regulators are advanced Automatic Voltage Regulators, which are designed to protect your valued electrical/electronic product from all kind of electrical power faults and so yields better product life.

SVK Servo Voltage Regulator has many advanced features, one of which is communication by using RS232 or by using RS485 communication protocol.

RS232 and RS485 both are serial communication protocols but differ in Physical layer. Both have their own advantages and disadvantages.

RS232 is mainly used for communication within a short distance from the Host and it uses inverted signaling voltage levels of +-12V. It is comparatively slow but needs a very few hardware components for full duplex point to point communication.

On the other side RS485 is used for long distance communication of the range from a few meters to 1200 meters. It uses differential signaling and so it is preferred in noisy environment like industrial area. It can operate at much higher speed and can be used for multi system communication.
 
Sr. No Parameter RS485 RS232
1 Differential Yes No
2 Modes of operation Half Duplex - Differential Full Duplex
3 Network topology Point to Point Multipoint
4 Baud rate 300 - 57600 300 – 57600
5 Distance 1200m 15m
6 No. of Connected Devices 32, can be extended to 256 1
7 Signal Levels +/-(1.5 – 5) V +/- (5-12V)
8 OS support Win 98, 2000 & XP Win 98, 2000 & XP
 
 

Key Features of SVK RS232/RS485 Communication

  • Support for both RS232 as well as RS485 communication protocol.*
  • Optically Isolated RS232&485 to ensure any malfunction or failure due to high voltage and noise.
  • Designed with powerful next generation PIC18 series device.
  • Very simple Plug & Play operation auto baud rate detection feature.
  • Support for multi system communication with up to 32 devices. This can be further extended to 256 devices by using repeaters.
  • RS485, as it is using differential signaling, can be used in noisy Industrial environment where normal communication, like RS232 is not possible.
  • Operating distance can be as long as 1200m for RS485 and 15m for RS232, without using any repeaters.
  • Advanced monitoring and controlling of single or multiple Servo Systems from a single PC.
  • Easy to use Graphical User Interface.
  • Various Fault Indications for safe operation in the field.
  • 1sec update rate for all parameters like Input Voltages, Output Voltages, Load current, Frequency and faults.
  • User can change the output voltage from the comfort of their chair.
  • Remote ON/OFF facility from the PC
  • Remote buzzer control **
  • User can also get system information’s like Serial No, KVA rating, Warranty Period, Voltage range, Fault history, last fault details etc.
  • In multi-system communication, user can choose for auto scrolling of the system, so each system can update their status in 15 sec.
  • Software utility also allows user to generate System Status Report for single or multiple systems
  • Supports Windows Operating Systems (Win 98, Win 2000, Win XP).
   
* SVK has RS232/485 compatibility but add-on hardware is must which is optional
**On board buzzer is not standard feature but it is provision on the board, it can be provided on request
Eflyer
Brochure
User Manual

Rating

  • Air cooled
  • Oil cooled
3 KVA to 75 KVA
75 KVA to 4000 KVA
* Above 4000 KVA models are customized
 

Input Voltage Range

  • Standard
  • Standard (Wide range)
  • Standard (Narrow range)
340 V to 480 V
300 V to 500 V
360V to 460 V or 380 V to 480 V
Input Voltage : 300V to 470V or 340V to 480V line-to-line, 3 phase 4-wire system (Balanced or unbalanced to be specified) or as specified by customer.
Output Voltage : 415 Volts ± 1%, line to line Nominal or as specified by customer.
Rate of Correction : Up to 100V / Sec.
Response Time : 10 m sec.
Efficiency : 98 %
Waveform distortion : Nil
Effect of power factor : Nil
Line Frequency : 47 to 63 HZ
Cooling : Air-Cooled up to 75 KVA, Oil-Cooled for higher KVA Rating.
Protections : Automatic High / Low voltage cut off.
Overload and short circuit protection.
Single phasing preventor.
  • True digital control
  • Electronic overload protection
  • Network connectivity
  • Energy meter with RTC (Optional)
  • Variac protection against high voltage (Optional)
  • Phase Reversal Protection (Optional)
  • Carbon brush failure protection (Optional)
  • Highly reliable sensorless control (Optional)
  • Real Time Clock (RTC)
  • Audio alarm at extreme input voltage
  • Line noise and surge suppression network
  • Ultra Isolation Transformer at output
  • Healthy Phase Selector
  • Harmonic filter for non-linear load
  • Input out of range protection
  • EMI/RFI filter
  • Phase sequence protection
  • Non-standard rate of correction
  • By-pass feature
  • IT layout
  • Cabinet Design
  • Colour Shade
  • Cable entry
  • Termination box
  • Terminals for
IT at Output of SCVR
Within SCVR cabinet
Standard
Bottom
Front
Copper cables
OR
OR
OR
OR
OR
OR
IT at Input of SCVR
Separate cabinet
Others
Top
Back
Aluminum cables
Sr. No. Model No. Rating (KVA) FLA (Amp) Cooling DIMENSIONS WT DIMENSIONS  WT
Type 340-480 300-500
H W D KG H W D KG
1 VS  3203 3 4 Air 760 305 665 65 760 305 665 65
2 VS  3205 5 6.6 Air 760 305 665 75 760 305 665 75
3 VS  3207 7.5 10 Air 760 305 665 75 760 305 665 83
4 VS  3210 10 14 Air 760 305 665 84 760 305 665 95
5 VS  3215 15 20 Air 760 305 665 95 760 305 665 110
6 VS  3220 20 27 Air 760 305 665 111 760 375 775 130
7 VS  3225 25 32 Air 760 375 775 134 760 375 775 143
8 VS  3230 30 41 Air 760 375 775 145 760 375 775 158
9 VS  3240 40 54 Air 760 375 775 162 1370 450 720 198
10 VS  3250 50 68 Air 1370 450 720 225 1370 450 720 260
11 VS  3250 50 68 Oil 750 1120 885 150 750 1205 940 200
12 VS  3260 60 82 Air 1370 450 720 294 1680 500 870 330
13 VS  3260 60 82 Oil 705 1250 940 240 750 1205 940 260
14 VS  3275 75 102 Air 1680 500 870 340 1680 500 870 385
15 VS  3275 75 102 Oil 1155 1455 1070 300 1155 1455 1070 345
16 VS  32100 100 136 Air 1680 500 870 470 1680 500 870 475
17 VS  32100 100 136 Oil 1155 1455 1070 375 1155 1455 1070 420
18 VS  32125 125 170 Air 1680 500 870 510 1680 500 870 550
19 VS  32125 125 170 Oil 1155 1455 1070 450 1185 1775 1040 460
20 VS  32150 150 205 Air 1680 500 870 560 1680 500 870 575
21 VS  32150 150 205 Oil 1185 1775 1040 485 1185 1775 1040 508
22 VS  32200 200 275 Oil 1185 1775 1040 518 1185 1775 1040 585
23 VS  32250 250 340 Oil 1185 1775 1040 665 1185 1775 1040 710
24 VS  32300 300 410 Oil 1180 2775 1040 750 1185 1775 1040 850
25 VS  32400 400 550 Oil 1760 1760 1370 1000 1890 2530 1285 1100
26 VS  32500 500 685 Oil 1325 2070 1360 1400 1670 2175 1380 1500
27 VS  32600 600 820 Oil 1670 2175 1380 1500 1525 2730 1865 1650
28 VS  32750 750 1044 Oil 1670 2175 1380 1800 1525 2730 1865 1975
29 VS 321000 1000 1391 Oil 1525 2730 1865 2300 1880 2705 2525 2450
30 VS 321200 1200 1670 Oil 1900 2730 1865 2625 1700 2300 2750 2825
31 VS 321500 1500 2100 Oil 1900 2730 1865 3100 1900 2300 2700 3300
32 VS 322000 2000 2800 Oil 1700 2300 2800 3675 1900 2300 2700 3900
33 VS 322500 2500 3500 Oil 1900 2300 2700 4225 2175 2300 2700 4475