Products

Servo Controlled Automatic Voltage Regulators

The hazards of over-voltage are well known and these voltage fluctuations constitute a serious problem for users of most of the electrical equipments. Servo controlled AVR's are designed and manufactured by us for the healthy operation of sophisticated equipments. Our Electro Servo Motor Controlled AVAR’s are high speed electromechanical regulators, manufactured from the highest quality raw materials available. Superior transformer design and top quality raw material used in our Servo’s makes them highly efficient in handling any voltage fluctuations in the main supply

Key features

We design both double wound and buck boost type servo as per the requirement
Our buck boost transformers are manufactured with glass ware insulated copper with magnesil mitter core for best results.
Digital and Solid state control circuitry are used.
In oil cooled servo, we provide oil indicator with temperature meter.
Energy savings due to high efficiency and superior transformer design.
No wave form distortion.
High speeds of correction up to 35V/sec for three phase and 20V/sec for single phase.
Machine wound variacs with special carbon brushes for enhanced life.
Simple, systematic construction for dependability and ease of maintenance.
Conforms to IS: 9815 specification.

Specifications

	Single Phase	Three Phase
Input Volts*	100-260V	200-440
Output Volts*	230 +/- 1%	380/400/415 +/-1%
Efficiency	>95%	>98.5%
Frequency	48-52 Hz	48-52 Hz
Wave Form Distortion	Nil	Nil
Temperature	Depends on type of cooling and IS Specifications
Environment	Designed for indoor tropical use

SELECTION GUIDE

How to choose a Servo Stabilizer

There can be three types of loading conditions in an electrical system
- All the loads are of three-phase nature.
- There is a mixture of three-phase and single-phase loads.
- All the loads are of single-phase nature.
In view of the above facts and the guiding principle, the choice of a three phase stabilizer for condition (a) and (b) falls on balanced load type stabilizer.
An unbalanced load type stabilizer should be used only for option (c)

The neutral needs to be solidly grounded for proper functioning of the electrical system.

APPLICATIONS in main line of:

Banks and offices
CNC Machines	Air Conditioning Plants
Telecommunication Networks	Motor Loads
Data Processing Equipment	Bio Medical Equipment
Drives, PLC's	Induction Heating
Hotels	Defense Application
Industrial Units	Lighting Loads
Residential	Farm Houses
R & D Institutions	Sophisticated Laboratories

ACCESSORIES (Optional)

Low/High voltage trip
Short Circuit Protection
Single Phasing Protection
Input/Output Voltage Metering
Reverse Phase Protection
Isolation Transformer
Silica Gel breather
Change over Switch
Oil drain valve

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Servo Controlled Automatic Voltage Regulators

Some Of Our Clients

Fault		Remedies
1)	Output voltage Unbalanced	1. Check input supply weather all 3 phases are present. If so ; 2. Carbon brush may have worn out broken. 3.Snapped or loose; connection on input/output. Correct the same.
2)	Output voltage Fluctuating Continuously	i) Adjust P3 plot clockwise on the servo control card till fluctuation stop. This can be done only on auto mode. ii)The carbon may be worn out and is causing sparkling on the track. Change the carbon. iii)Check for any loose connection on the input or the output side.
3)	Continuous Rattling/hunting Sound	i) Adjust P3 plot clockwise on the servo controlled card. Keep switching in ‘auto’ mode. ii) The gear on the motor and the main gear mismatching. Adjust the motor by loosening it four holding screws and moving the motor to match the two gears. Tighten the motor in the correct position.
4)	Output voltage not Regulating	i) Put the switch in manual mode and try to raise or lower the output voltage. ii) Check if the motor is running. Incase no change in voltage occurs; the gear on the motor shaft is definitely not matching with the main gear. Please do the needful as explained above. iii) Put the switch in auto mode after correction. If still not regulating to the correct value the control card may be defective. Before removing the control card short terminal No. 5 & 6 and then check. If still no function in output voltage occurs , change the card. iv) The voltage adjust pot provided on the front panel may be open, change the pot.
5)	Tank over – heating Beyond limits	i) Check for overloading on all three phases. The normal temperature of the oil should not be more than 45 degrees centigrade above the ambient. If the temperature is more there may be some short in the winding. Thus, requiring a major repair. ii) The oil might have fallen due to some leakage and this can also result in overheating.