SOFT START The starting current drawn by an induction motor is directly proportional to the applied voltage. The Soft Starter is designed to make it possible to choose the lowest voltage possible(pedestal voltage) at which the motor can be started - the lowest voltage being dependent on the load on the motor. The voltage is ramped up from this pedestal level to full voltage in the set time (selectable- 0 to 10 seconds). Pedestal voltage and ramp time can be set at site. It is also possible to provide controlled torque soft start with current limit option. Soft start feature can also be provided, as optional. ENERGY SAVING A majority of induction motors in industries are under utilized due to a combination of design/selection/safety considerations. This results in substantial energy loss, by way of wasted power and consequent rise in the temperature of the motor, which is harmful to the motor in the long run.

WATT - WIZARD ENERGY SAVER SOFT STARTERS are ideal for saving Energy when used with induction motors which are operating at partial or on cyclic loads. They automatically control the voltage applied to the motor, to that required to meet the varying load conditions without sacrificing torque or speed, resulting in reduced power consumption and consequent saving in KWH and improved power factor.

ENERGY SAVER SOFT STARTERS are ideally suited :

where a smooth start is desirable to avoid shocks to the drive system or where a gradual start is required to avoid damage to the product/process/drive system and accessories. where system voltage drop is to be eliminated or undue loading of generators is to be avoided. where in-rush current is to be limited to avoid heavy line voltage drop while starting high capacity motors or high inertia loads. for reduction of maximum demand when motors are started frequently. where energy saving is desired under partial or cyclic load conditions and to improve power factor

ADVANTAGES

Smooth start and Stepless Gradual acceleration of motor and consequent elimination of shocks during starting. Reduction in peak motor current during starting. Reduction in maximum demand. Reduction in motor temperature, increased motor life and decreased maintenance. Comfortable Inching without ant damage. Power factor improvement. Reduced power consumption and hence reduced energy bills. No moving parts that can be affected by dust, dirt or other such environmental factors. Easy installation and Retrofit capability (3 wires in, 3 wires out) - Solid state - low maintenance. Replaces electro-magnetic starters as well as fluid couplings.

HOW WATT WIZARD ENERGY SAVER STARTER WORKS : PRINCIPLE

WATT - WIZARD ENERGY SAVER SOFT STARTER consists of Silicon Controlled Rectifiers (SCRs), sensing and control circuits to control the firing of SCRs.

Soft Start is achieved by progressive phasing back of the firing of SCRs in the present time. To achieve energy saving the phase angle between the voltage and current is monitored continuously to obtain a signal proportional to the phase angle, based on which the firing of the SCRs is controlled. When the phase angle increases, (which is indicative of low power factor), the control circuit adjusts the firing angle to decrease the average voltage applied to the motor and vice versa.

FEATURES

All the above models have the following features : Soft Start facility, with initial torque pot. for setting pedestal voltage, Ramp time pot. for setting ramping time; adjustable from 0 to 5 secs. Longer ramping time can be provided. (Please refer to us with full details of application. Energy Saving. Indication for Mains ON and Motor ON. Push buttons for start and stop. Starting overload trip with indication. Running overload trip with indication. Current based single phasing trip with indication. Anti-stall facility with indication. Energy saver by-pass switch.

TECHNICAL SPECIFICATIONS

Power input	415/440 volts AC -+ 10% 3 phase 50 hz.
Recommended load	A.C. motor, three phase, Multiple Motors or other loads are not recommended except under specific circumstances. (Consult us for further details).
Maximum Overload capacity	115% continuous, 150% for 10 seconds and 200% for 5 seconds.
Altitude of Installation	1000 meters. (Above 1000 meters derating has to be done).
Voltage rating of Thyristors	1400 PIV.
Type of cooling	Air-cooled upto 75 HP. Force-cooled above 75 HP.
SCR Protection	MOV transient voltage suppressors to absorb high energy voltage transients provided across the input supplu points. RC Snubber circuit is porvided across SCR to prevent misfiring due to rapid rise of voltage. (dv/dt).

ENERGY SAVING CASE STUDIES

Equipment to which motor is coupled, HP & No. of working hours/year	Power Consumption in units/hour		Savings Per Year (in units)	Payback Period (in months)
	Without "Watt Wizard" ESSS	With "Watt Wizard" ESSS
1. Blower Fan 20 HP (5000)	7.24	6.25	5110	20
2. Pallet Conveyor 10 HP (6000)	2.00	1.20	5958	13
3. Vertical Turret Lathe 20 HP (5400)	4.90	4.10	4320	23
4. Air Compressor 40 HP (6000)	21.00	18.95	12300

APPLICATION INDUSTRIES

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TYPICAL APPLICATIONS

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