From the Desk of Managing Director - Amtech Electronics€¦ · From the Desk of Managing Director...
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From the Desk of Managing Director
FOR PRIVATE CIRCULATION ONLY JANUARY 2017
Official News Letter of Amtech Electronics (India) Ltd., Gandhinagar, Gujarat (India)
AN ISO 9001 : 2008 COMPANYQM 003
Appl. Case Study
“You question,we answer”
PresenceAcross the Nation
no one has beenever
succeeded in theworld yet.
Digital Excitation &Control System
Prince Bismark of Germany was well known for hisminute and detailed observations.Once he was invited by Czar of Russia to Moscow. Onone fine morning, the Prince went alone for a morningwalk in Moscow. After the morning walk, the Price andthe Czar were together for the breakfast. “How was yourmorning walk, dear Prince?”, asked The Czar smiling at
Prince. “Well, it was wonderful. You have excellent climate here. But I saw asoldier, guarding a tree on the way. Is that tree so important, that its guarding,round the clock is required?”, asked the Prince with curiosity. “A soldier for atree? I can't place it, I need to check up.” Replied the Czar with a bit ofconfusion and embarrassment. The Czar called his prime minister andordered the immediate investigation.It was found out that about hundred years back, there was a royal monumentthere and a soldier was kept for round the clock guarding of the monument.The monument got perished over time and a tree grew there. But nobody fromCzar's dynasty noticed that now there is no need of any guarding there.Morale: Just do not follow the tradition, verify the requirement of yourresources.
- AMTECH FAMILY
Minimizing Motor ShaftBearing Current
Energy Saving in Pump
Hydro FlowAutomation System
Power QualityActive Harmonic Filter,
Active Front End Converter
Motion ControlAC Drive, MVD & Soft Starter
ACTIVE FRONT END CONVERTER
ACTIVE HARMONIC FILTER
PLC SCADA, HMI
AXPERT-EAZY AXPERT-VT 240S AXPERT-OPTI TORQUE
AN ISO 9001 : 2008 COMPANYQM 003
STATCON: MULTI-FUNCTIONAL ACTIVESTATIC VAR COMPENSATOR
Design & Developmentfor Customers in
TRACTION DRIVE WIND POWER CONVERTER SOLAR INVERTER HIGH VOLTAGE POWER SUPPLY
TO WHOMSOEVER IT MAY CONCERN
This is to certified that we are using wide range of make AC VFD from 5kW to 355kWAmtechsupplied by M/s , the details stated asAMTECH ELECTRONICS (I) LTD, GANDHINAGARunder
Sr. No. VFD Rating Application
1. 110kW MAIN CANE CARRIER
2. 200kW FEED PUMP
3. 355kW ID FAN
4. 9.3kW BAGASSE FEEDER-02 Nos.
AboveAC Variable Frequency Drive are running successfully since 2013 and thereafter SalesService support is satisfactory.
We consider M/sAmtech as our partner not vendor. We wish them all the best.
Bajaj hindusthan ltd, unit Gangnauli
Unit : Village Gangnauli, P.O. Tanshipur, Tehsil Deoband, Discreat Saharanpur-247551 Tel +91-1336-235401, Fax: +91-1336235403Regd. Office : Golagokarannath, Lakhimpur-Khari, District Khari, Uttar Pradesh - 262802. Tel:+915876-233754/5/7/8. 233403, Fax:+91-5876-233401CIN : L15420UP1931PLC065243
OverviewOne cause of premature bearing failure is so-called “electrical discharge machining.” This problem has been aroundfor many years. Current takes the path with the least resistance which is sometimes through the motor bearings. Thecurrent concentrates near the contact points and can cause pitting, fluting and other damage. The bearing’s lubricationalso plays an important role in determining the path of current flow and the extent of bearing damage that may occur.
All electrically driven rotating machines generate some level of AC and/or DC shaft voltages, but they are generallyinsignificant. AC induction motors are no exception, and when driven by PWM type AC inverters, the problembecomes more severe. But at what voltage and current level does this phenomenon become a problem? There aremany different views on what levels are acceptable. Different methods of grounding, the type of equipment, bearinglubrication, bearing clearances, bearing types, etc. can all affect the severity of the problem.
Minimizing bearing and shaft current leakageIn our experience, this phenomenon has not posed a significant problem for most motors. Many motor manufacturershave developed improved winding techniques that minimize the generation of bearing currents in the first place.However, there are some basic rules that will minimize the likelihood of problems in typical applications:
1. Keep the motor circuit lead length as short as possible.2. Use shielded cable or cable installed in steel conduit for motor leads.3. Operate the inverter at lowest carrier frequency that is practical (below 5 kHz).4. Ensure proper grounding techniques are used, including proper cable selection and optimizing ground
location; eliminate floating ground, ground loops, etc.
Should a bearing current problem be encountered, we offer inverter output filters and reactors that will reduce high-frequency components of the inverter output waveform. Other options that can be considered are installation of a shaftgrounding brush, or use of motors with insulated bearings, but these are rarely necessary.
Title : Minimizing Motor Shaft Bearing Current
Recommendations and guidelines
Every VFD Application
Set carrier frequency <6kHz The lower the carrier frequency the better
Specify VFD model with carrierfrequency adjustability incrementsno larger than 1kHz
Fine tune to the lowest acceptable level
Shortest possible conductor lengths Reduces reflected wave current
Shielded cable with continuous low-impedance ground path from theVFD to the motor
Various 3rd party grounding systems areimmerging in the market
< 25 HP motor Shaft grounding device Some protection - requires maintenance
25 HP & larger motor Insulated motor bearings Higher level of protection
Long lead conductor Inductive or RCL filterHas to be individually tuned to theapplication
Difficult access to motor Insulated motor bearingsHigher level of protection - avoid high laborfor motor replacement
Motor bearing failuredespite protection
Voltage analysis to locate damagingcurrent loops
Specialized equipment & personnelrequired
Noisy motor bearingoperation
Vibration analysis to look for signs ofdamage in motor bearings
Specialized equipment & personnelrequired
Failed motor bearingremoved from motor
Inspect motor bearing races forsigns of “pitting” or “fluting”
Qualified motor service technician required
For… Recommendation: Notes
Payback period approximately 4-6 Months
APPLICATION CASE STUDY
Title : Energy Saving Pump DOC.NO. : CS-237
Industry : Paper
Application : Pump
Motor rating : AC Induction Motor, 3-Phase
Previous system : Motor was running on Star Delta starter.
Problem observed : 1) High maintenance cost.
2) Energy losses due to flow control by valve.
Present system : Amtech 37 kWAxpert -VT240S VFD used in place of Star Delta starter.
Amp Frequency Valve Position
(Without drive) : 58Amp 50 Hz 75 % Open
(With drive) : 37Amp 38 Hz 100% Open
System block diagram :
Merits of new system : 1. Easy & smooth operation.
2. Energy saving due to flow control by VFD.
Economical analysis :
37 kW, 3-PHASEINDUCTION MOTOR
�Energy consumption without VFD - P1 = 35.4 kW
�Energy consumption with VFD - P2 = 25.6 kW
�Energy saving per day ((P1 - P2) x 24) = 235.2 Units.
�Saving per day @ Rs. 4/- Unit = Rs.940.8/-
�Saving per year (Approx. 300 Days) = Rs.2,82,240/-
AMTECH POWER VISION
Title: Digital excitation and control system DECS-150
Additional Features and Functions:
� Automatic voltage matching to the bus voltage when being paralleled
� Bumpless transfer between active and inactive modes of operation
� Integrated Power System Stabilizer (optional) • Allow for up to three (3) preposition settings
• Over excitation Limiting • Under excitation Limiting• Stator Current Limiting • Under frequency.
• Loss of sensing • Generator over voltage • Generator under voltage Generator over frequency
• Generator under frequency • Exciter �eld over voltage • Exciter diode open detection • Exciter diode short detection • User
programmable protection • Syn-check Protection •Generator frequency Less than 10 Hertz • Con�gurable Protection
Set up via PC using BESTCOM Plus Software and integrated PLC for Customizable logic
USB type B port (front or rear panel optional) Ethernet: RJ45 jack (rear panel) 10BASE- T/100BASE-TX (copper)
Diagnostics and event recording
� R • Oscillograph • Sequence of events record up to 1000 time.eal time monitoring
• HMI Eleven (11) LED indicators will be located on the front of the unit and will indicate the following conditions :
• Manual Mode Active • Var/PF Active • Loss of Generator Sensing • OEL Active • UEL Active • Generator Over voltage • Over
excitation Shutdown • Under frequency Active • Exciter Field Current Limit • PSS Active* • Customer Alarm
A microprocessor based, high performance, digital excitation system ( ) willDECS-150be supplied to provide the required excitation to the exciter �eld of a synchronousgenerator. The digital excitation system will provide controls, limiters, and protection forthe generator as outlined below. The will use BESTCOMSPlus® PCDECS-150software to monitor, control, and program the controlled parameters of the excitation
Inputs and Outputs:
� 63 V DC and 125 V DC @10 A DC pulse width modulated (PWM) Output
� Single or three phase voltage sensing with nominal inputs of 120 V AC, 240 V AC, 480 VAC, and 600 V AC.
� Single or three phase current sensing with nominal inputs of 1 A AC or 5 A AC.
� Eight (8) fully programmable digital inputs.
� Three (3) output contacts, two (2) of which will be fully programmable, capable ofmaking, breaking, and carrying 7 A.
� Single or three phase power input accepting an input of 100 V AC to 277 V AC at 50 Hz to500 Hz from generator line, PMG, or auxiliary winding.
� Automatic voltage regulator Mode with at least ±0.25% from no load to full load
� Integrated manual �eld current regulator Mode.
� Integrated var/power factor controller Mode.
� PID Adjustments • Auto tuning • Parallel Operation • Reactive Droop Operation
� Line Drop Compensation.
Title: Hydro Flow Automation System
� Accurate water pressure control
� Flow control option for various distribution sections
� Service life operation control of pumps
� Factory-tested integration
� Simpli�ed setup with standard solution based panel
� Smooth starting and operation of system
� User-friendly display
� Full motor protection
� Ef�cient VFD and soft starter
� Intelligent process controller
� Energy consumption reduced by 20~25%
� Constant pressure control gives smooth operation of plant processes
� No manpower required as system starts/stops pump as per pressure
� Eliminates inrush currents
� Smooth acceleration and deceleration by VFD reduces mechanical stress
� on machine, which increases life of mechanical parts compared to DOL orstar/delta starter
� Better reliability, more uptime
� Appropriate displays are provided on the HMI unit to
assist with pinpointing any faults
� Short payback period with better productivity,
reduced energy consumption
� Improved process �ow and excellent value for money
� Instant identi�cation of water wastage at
particular section by �ow control
� Low operating costs
� Quick and safe commissioning
� Minimized maintenance costs
� Quali�ed after-sales service by Amtech assistance
The new generation of control system, developed by integrates the operation of HydroAmtech Electronics (India) Ltd,Flow Control System with respect to plant requirements.
Amtech offers an innovative and smart solution of Hydro Flow Control with Automation Package, based on its variablefrequency drive, soft starter and intelligent process controller. This combination is for various capacities and quantities ofRaw water, Soft water, De-mineralized water, ETP re-usable water pumps.
This system provides water conservation in utility area of Dairy plants or any other industries where water is distributed inmany plant sections.
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YOU QUESTION, WE ANSWER
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Question:How to calculate problematic Harmonic Frequency in a plant?
Given data:Feeder transformer rating, MVA : 2Primary voltage, KV : 13.8Secondary voltage, Volts : 480PF capacitors, KVR : 700Electrical connections : DeltaSupply frequency : 50 Hz
Answer:We need to find out the Resonant Frequency, due to resonance between inductance of feeder transformer and PFcapacitor, which is the problematic Harmonic Frequency, to be eliminated by the Harmonic Filter.Secondary Phase current = 2 (MVA) x1000000/(3 x 480)
= 1389 AInductive Reactance = 0.06 (Percentage impedance) x 480/1389 -----------------------------( 1 )
= 0.0207 OhmsInductance = 0.0207/(2 x 3.14 x 50)
= 0.0000660 HenriesPF Capacitor phase current = 700 x 1000/(3 x 480)
= 486 APF Capacitor reactance = 480/486
= 0.988 OhmsPF Capacitor = 1/ (0.988 x 2 x 3.14 x 50)
= 0.003225 Farads ------------------------------------------------------------- ( 2 )From (1) and (2) Resonant Frequency = 1/(2 x 3.14 x Square Root (0.0000660 x 003225)
= 345 HzHarmonic Order of Resonant Frequency = 345/50
= 6.9= 7.0 Approximately.
Hence we need to filter of 7th Harmonic, because if 7th Harmonic is present it will cause resonance.
PRESENCE ACROSS THE GLOBE
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Works & Regd. Office :
Amtech Electronics (India) Ltd.E-6, GIDC Electronics Zone,
+91 79 23289101, 23289102, 23289103+91 79 [email protected]
Gandhinagar-382 028, Gujarat (India)
M. D. Kamath
Contact Person Phone No. (O) Mobile No. E-mail
022-28846083Vrajesh Yadav 09819900501
T. S. Sridhar 044-26358919 09840618533
Umesh Bhatia 09589344318Indore / Raipur [email protected]
S. Senthil Kumar 044-26358919 09940229955 [email protected]
H.O. and Service Center
Contact Person Phone No. (O) Mobile No. E-mail
Bhavna Thakkar 09909975944H.O. Gandhinagar [email protected]
Rajesh Moradiya 09909973780Amtech Service Center,Gandhinagar
Resident Sales /