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Digital SUPERSTART
Digital Reduced-Voltage
Motor Starter with Current Optimizer
Standard Features
LCD diagonstic display
Full digital compact design
Simple one-step calibration
Electronic overload protection
Dual-adjustable starting modes: current limit and current ramp
Kick start
Pump and fan control
Soft Stop (deceleration)
MOV & RC snubber transient protection
Six SCR full-wave control
Phase loss protection
Phase reversal protection
Shorted SCR protection
Current-optimizing circuit
Jogging capability
Remote reset capability
Rugged, compact, modular design
NEMA 12, NEMA 1, protected chassis
General Description
Adanced electronic technology has made electromechanical reduce-voltage starters and dual-wound motors obsolete. Graseby Controls has become a leader in the innovative and durable design of digital AC motor controls. SUPERSTART continues this tradition of engineering excellence that recognizes the needs of industry.
SUPERSTART digital reduced-voltage starters limit motor strating current to provide smooth and stepless motor acceleration to full speed. This limits current in-rush and eliminates starting shock to mechanical couplings and gears. Starting current (torque) is fully operator-adjustable. Motor protection is provided by a sophisticatedelectronic overload cicuit, with complete diagnostic status of the strter shown on an LCD display. A current-optimizing cicuit operates under no-load or lightly loaded conditions to reduce current demand. Models cover the range from 10 to 1000HP, up to 690V.
Principles of Operation
SUPERSTART provides smooth, stepless acceleration by phase-controlling three sets of inverse parallel SCRs connected in a three-phase switch configuration. The unit controls three-phase voltage and current to the motor by varying the portion of the three-phase sine wave conducted by each SCR.
Three-phase current sensing is used for overload sensing and as the feedback signal necessary for stable control of the "current ramp" mand "current limit" starting mods (both standard). This allows a choice of either current ramp or current limit starting, depending on application requirements. The current-optimizing circuit can be activated following starting. It controls motor voltage to reduce reactive current and power.
Options
Reversing
Dynamic braking
Chassis models
Auxiliary controls
Pushbuttons
Bypass contactor
Enclosures other than standard
I2t fuses
Circuit breaker disconnects (w/c or w/o shunt trip)
UL listed