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

Piyush Patel

Page 2

Customer’s Voice

Page 3

Techno-Talk

Page 4

Appl. Case Study

Page 5

Amtech Power

Page 6

Product Overview

Page 7

“You question,we answer”

Page 8

PresenceAcross the Nation

Editor:Atul Suthar

Inside

Without hardwork,

no one has beenever

succeeded in theworld yet.

Digital Excitation &Control System

DECS-150

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

IndustrialAutomation

Controlling

Operating

Driving

Networking

Motion ControlAC Drive, MVD & Soft Starter

ACTIVE FRONT END CONVERTER

AXPERT-HIVERT MVD

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

AMTECH

IndustrialElectronics

Design & Developmentfor Customers in

Power Electronics

TRACTION DRIVE WIND POWER CONVERTER SOLAR INVERTER HIGH VOLTAGE POWER SUPPLY

2

CUSTOMER’S VOICE

Date:- 07-10-2016

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.

Parvind Kummar

(HOD ELECTRICAL)

Bajaj hindusthan ltd, unit Gangnauli

Saharanpur (U.P.)

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

3

TECHNO-TALK

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

4

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

37kW :

415VOLT :

2950RPM :

50Hz :

64AMP :

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

Previous system

(Without drive) : 58Amp 50 Hz 75 % Open

Present system

(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

AXPERT-VT240S

3-PHASE,

415 V,

AC SUPPLY

37 kW

PUMP

�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

5

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

Limiter functions:

• Over excitation Limiting • Under excitation Limiting• Stator Current Limiting • Under frequency.

Protection :

• 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

PC software:

Set up via PC using BESTCOM Plus Software and integrated PLC for Customizable logic

Password protection

Communication:

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

Physical requirements

• 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

FEATURES

General

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.

Control Features:

� 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.

6

PRODUCT OVERVIEW

Title: Hydro Flow Automation System

Features

� 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

Bene�ts

� 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

requirement automatically

� 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.

7

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Your Valuable Feedback

YOU QUESTION, WE ANSWER

Kindly email your feedback to info@amtechelectronics.com

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 23289111info@amtechelectronics.comwww.amtechelectronics.com

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Gandhinagar-382 028, Gujarat (India)

M. D. Kamath

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Regional Offices

Contact Person Phone No. (O) Mobile No. E-mail

022-28846083Vrajesh Yadav 09819900501

09108051977

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S. Senthil Kumar 044-26358919 09940229955 chennai@amtechelectronics.com

H.O. and Service Center

Contact Person Phone No. (O) Mobile No. E-mail

Bhavna Thakkar 09909975944H.O. Gandhinagar bhavanat@amtechelectronics.com079-23289101-102-103

Rajesh Moradiya 09909973780Amtech Service Center,Gandhinagar

csd@amtechelectronics.com079-23289101-102-103

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