voltage stabilizer

Green Dot Electric Corpn.

1040/14/1, Mehata Industrial Complex

Triveni Road, Yeshwantpur

Bangalore 560054

Ph: 080-3371044 / 3374310 Telefax: 3371044

email: [email protected]

Green Dot

No. RKD/2002/SV /CMTI1 Dated 10/07/2002

QUOTATION

Sr. Administrative Office ( Purchase )

Central Manufacturing Technology Institute

Tumsur road

Bangalore – 560 022

Dear Sir,

On the above subject and reference, we are pleased to quote as follows. We

have quoted you for our Micro Controller Based Digital Series – which will go to give you

escalated taste of a Quality product – engineered by us to suit specific requirement of

users in CNC field requiring high speeds of correction and without the high speed gear box

and carbon brush incorporated D.C. Motors. The units use A.C. Step Synchronous Motors

only – which are low speed high torque permanent magnet rotor motors – which are burn

Sub: Servo stabilizer / Isolation Transformer 40 KVA Capacity

Ref: Your No. C405/DAP/Pur/02/MTE Dated 04/07/2002

Green Dot Electric Corporation

Quotation : “Servo Dot” Servo Stabiliser

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Head Off: Green Dot Electric Corporation : G-9 Hemkunt Tower 98 Nehru Place New Delhi 110019 Works at Delhi & Bangalore

Ph: 6416395 – 6222088 Fax: 6222089 Email : [email protected]

Green Dot

proof and they have no load current equal to full load current and further equal to locked

rotor current. High Quality Variable Transformer used add reliability unexpected hitherto

in the line and with the reliability achieved in the equipment, we are providing 5 YEARS

WARRANTY on the same.

A little bit about Ourselves:

We are one of the Oldest & Original manufacturers in the line – with all inhouse

manufacturing facilities – including those of the Variable transformers – which constitute a

sort of Engine for a Vehicle. We are established brand all over India and abroad for the

last 21 Years now. Ours is a QUALITY PRODUCT – that can live life upto 20-30 Years and

is designed to see that this needs least maintenance. We are exporting about 40 % of our

production to countries as Australia for last 10 years regularly.

We look forward to receive your valuable order and build up everlasting

relationship. Our Installation Base of these stabilizers is quite large and because of our

Quality and services, the Customer – once with us is always with us and thus in our

Customer List – there are repeated purchases running into 10-50 Stabilisers , by the same

user over the years 21 – since the time we are in this manufacturing.

We are quite confident that one trial with us – will give you utmost satisfaction

on the product and you will keep our product as brand preference.

In the mean time – we will like to assure you best of our attention & services

Thanking you

for GREEN DOT Elect. Corpn

R.K.Dhawan

Marketing



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Green Dot

TECHNICAL BID

QUOTATION

ITEM 1. "Servo Dot ” Automatic Servo Voltage Stabiliser

Type OSD-33DG Suitable for unbalanced input & unbalanced load and

Input : 295-465 Volts 3 Ph. A.C. 50 Hz. Supply

Output : 400 Volts + 1 % - 3 Ph.

Capacity : 40 KVA

Type of Cooling Ail Natural Cooled Type - AN

Type of Enclosure Industrial – Transportable on Wheels

Dimensions Approx. 1.0X0.5X1.0 meters WideX Deep X Height

The Unit is provided with Audible Alarm for operation beyond Voltage Limits & beyond rated .

Technology – this is most advanced Servo Voltage Stabiliser in India with precise digital

Controls.

Ø Digital Display Panel with 9 Nos. of Digital 7 Segment LED – 3 Digit Displays -

(3 Nos. for each phase)

Ø Display 1 - Voltage Input Phase to Neutral in Volts

Ø Display 2 - Voltage Output Phase to Neutral in Volts

Ø Display 3 - Load Output Current in Amps.

Ø With Digital Control and adjustment through front panel of

Ø Output Voltage Level Adjustment

Ø Accuracy / Sensitivity adjustment from +1 to 8 Volts ( + 0.5 to 4 % )

Ø High Voltage Cut Off Voltage with Buzzer Alarm

V - IN V - OUT LOAD

AMPS

AUTO

AUTO- MANUAL CONTROL

MANUALENTERNEXTMENU INCREASE

DECREASE

160 230 65.0

a

Green Dot

PRODUCT

TM

V - IN V - OUT LOAD

AMPS

AUTO



DECREASE

160 230 65.0

a

Green Dot

PRODUCT

T M

V - IN V - OUT LOAD

AMPS

AUTO



DECREASE

160 230 65.0

a

Green Dot

PRODUCT

TM



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Ø High Voltage Cut Off Delay adjustment 1-25 Seconds

Ø Low Voltage Cut Off Voltage

Ø Low Voltage Cut Off Delay adjustment 1-25 Seconds

Ø Overload Trip Setting with buzzer alarm.

Ø Overload Cut Off Delay adjustment 1-25 Seconds

Ø Power On Delay adjustment 1- 255 Seconds

Ø Auto Manual Selector Switch with Voltage Increase / Decrease Switch, for

adjustment of Voltages in Manual Mode.

Ø Plug in Type Control SINGLE CARD for Level and cut off controls - & full Control

Box, drawable type, front accessible – with facility for on line serviceability

incorporating on Card front visible LED Displays as

Ø LED Displays for Low & High Voltage Limits

Ø LED Display for Unit Operation

PRICE As in the Commercial bid.

ITEM 1A: EXTRA FOR CUT OFF ARRANGEMENTS for the following :

Low & High Voltage Cut Off arrangement with Contactor

Single Phasing & Reverse Phase Cut off / Preventor

Overload Cut off arrangement along with other adjustments and controls described in the

following description.


ITEM 2 : Isolation Transformer

40 KVA Capacity with Electro Static & Electro Magnetic Shielding between Primary &

Secondary, Primary : 400 V/ Secondary : 400 Volts




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Green Dot

TECHNICAL SPECIFICATION

v Wave Shape

Distortion

Nil

v Effect of Load

Power Factor

Nil

v Efficiency 97 %

v High Voltage

Strength

2.5 KV between Live Parts and Earth / Body

v Insulation

Resistance

> 50 Mega ohms

v Insulation Class B

v Mode of

operation

Automatic - independently for each phase

Semi automatic - through AUTO – MANUAL selection Toggle

switch and spring loaded Dual On Switch - independently for

each phase

v Ambient 55 Deg. C . Max. Relative Humidity 90 %.

v Environment Indoor tropical use.

v Control Box Plug in Type Modular Box, independent for each phase for

convenient view & convenient maintenance. , self contained

with Control transformers and plug-in type Control Card,

standardised and interchangeable with the any other unit of

same type, isolated from the Power Cubicle / Tank to

ensure no transmission oh heat to Electronic components

from the Power Cubicle. The design and manufacturing

ideology adopted in the Control Box is to ensure

convenient maintenance through the years of life of

the unit.

v Control Card MICRO CONT ROLLER BASED Control Card coupled Difital

Display Card :

CONTROL CARD:

Single Plug-in CONTROL CARD - duplex controlling

parameters of

v Output Voltage Level Adjustment

v Accuracy / Sensitivity adjustment from +1 to 8 Volts ( +



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Green Dot

0.5 to 4 % )

v High Voltage Cut Off Voltage

v High Voltage Cut Off Delay adjustment 1-25 Seconds

v Low Voltage Cut Off Voltage

v Low Voltage Cut Off Delay adjustment 1-25 Seconds

v Overload Trip Setting

v Overload Cut Off Delay adjustment 1-25 Seconds

v Power On Delay adjustment 1- 255 Seconds

The Card is Plug in Type, Front Accessible, on line

Serviceable, Micro Controller Based Control , with NO

RELAYS, operating with Zero Voltage Switching and has

double Coupled Triacs for higher withstanding PIVs & long

life of triacs, workable in electrically noisy industrial

surroundings of welding sets, automatic Heater On-Off

environments with arrangement for Soft Start & soft

operation & no surges, free from jerks on Servo Motor,

gear or shaft, there by increasing life of Gears and Shaft

Bushes. The Cards before usage are Seasoned on

accelerated Switching Test Benches and are stressed with

Voltages to ensure long trouble free performance. The

Card ensures no hunting, no oscillations, and no noise

generation.

v Speed of

response

Electronic Card, 10 milliseconds or lower, with provision for

soft start.

v Delay in

Switching On –

Soft start

Function

The Cards have built in provision to delay the switching on

by adjustable time from Power On Delay adjustment 1- 255

Seconds – after the supply goes off and again comes in –

so that the load always has a soft start and gets on only

after the operation of the stabilizer has stabilized.

The equipment is thus fully protected from incidences of

instantaneous power off & power on and generator

switching on after supply line failures.

v Frequency 47Hz. To 53 Hz.

v Generator

Compatible

Subject to quality of wave form output from the generator,

the unit is generator compatible.



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v Set Volts Set Volts Level is digitally adjustable to +/ - 10 Volts from

the preset level without disturbing the sensitivity and

accuracy – which again is digitally adjustable from +1 to 8

Volts ( + 0.5 to 4 % )

v Sensitivity

adjustment

Accuracy / Sensitivity adjustment from +1 to 8 Volts ( +

0.5 to 4 % )

v Type of Servo

Motor

A.C. Step Synchronous motors that are burn proof, with

No-load current equal to full load current & equal to

running current, with permanent magnet rotor of 50 poles,

60 RPM Synchronous, 3 lead, Double winding, with R/C Net

Work, Genetically Slow Speed without any built on Gear

Mesh, Commutator, or Carbon Brush. Permanent magnet

Rotor is self braking in action and provides smooth

transition and correction of voltage without over stepping

or hunting.

In comparison to DC Motor used by a few, there is no high

reduction gear box (to reduce speed from 1500 RPM to 10

RPM ), no Carbon Brushes on Motor and thus is free from

any maintenance.

v Speed of

Correction

75 V / Sec.

Very fast and optimized speed of correction.

v Indications DIGITAL DISPLAY CARD

One for each phase :

For three Phase unit :

1. Three Digital Meters reading Input Voltage , Output

Voltage and Load Amps. for each phase - total 9 Digital

Displays.

2. LEDs – 3 Nos. Edge On mounted on Plug in Control Card

to display Control Card supply on, On-correction

operation indication and on limits - Low & High Voltage

Indication

v Overload

Capacity

120 % for 30 minutes.



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Green Dot

COMMERCIAL BID - ANNEXURE TO OUR TECHNICAL BID

ITEM 1.

"Servo Dot ” Automatic Servo Voltage Stabiliser

As per Technical specifications : of Type OSD-33DG Suitable for unbalanced input & unbalanced load and

Input : 295-465 Volts 3 Ph. A.C. 50 Hz. Supply

Output : 400 Volts + 1 % - 3 Ph.

Capacity : 40 KVA PRICE Rs. Each Rupees Fifty Thousand only. ( Rs. 50000.00 )

ITEM 1A:

EXTRA FOR CUT OFF ARRANGEMENTS for the following :

PRICE : Rs. Six Thousand & Five Hundred only. ( Rs. 6500.00 )

ITEM 2 :

Isolation Transformer

PRICE : Rs. Thirty Five Thousand only. ( Rs. 35000.00 )

TERMS & CONDITIONS

1. PRICE Ex- works Bangalore

2. EXCISE DUTY Nil at present. But will be chargeable extra as and when applicable.

3. SALES TAX Local Sales Tax @ 15 %. OUR KST No. 7180251-4 Dated 02/05/89 Against Form C @ 4 %

4. DELIVERY 2-3 weeks from date of Technically & Commercially clear order.

5. PAYMENT 30 Days Credit after supply of Material.

6. WARRANTEE Five years against any manufacturing defects.

7. VALIDITY 60 Days

for GREEN DOT Elect. Corpn.

R.K.Dhawan

Marketing