GE Industrial Solutions ASTAT-CD Plus - Manual (Page 5)

There are numerous applications where soft starting and limited
current peaks are needed for the starting of squirrel cage induction
motors. Traditionally reduced voltage starting was accomplished
using electromechanical starters such as star delta starters,
autotransformer starters, stator resistance starters or by using part
winding motors. These methods would provide a two, three or four
step torque change by switching the motor voltage from reduced
value to full voltage (in steps) after a preset time interval.
ASTAT-CD Plus Solid State Reduced-Voltage Starters (also known
as soft starters) use solid state devices to gradually increase the
voltage from an initial preset level (initial torque) to full voltage over a
selected time period. The same solid state devices may also be used
to reduce the voltage for the deceleration of the motor should this be
required in the application. This starting and stopping method
provides smooth, stepless acceleration and deceleration of AC
squirrel-cage induction motors. The ASTAT-CD Plus control circuitry
allows many additional functions to be accomplished, such as the
monitoring, protection and secondary functions listed.
Versatile Use
ASTAT-CD Plus Solid State Reduced-Voltage Starters offer
customer-configurable functions, including pedestal voltage, kick start
(selectable), acceleration ramp, current limit, and soft stop
(selectable). Typical applications include the following:
• Belted equipment • Centrifugal fans
• Centrifuges • Compressors
• Conveyors • Crushers
• Extruders • Fans and blowers
• Mixers • Packaging equipment
• Pumps • Textile machinery
1. Overview
1-1
1-1. Applications
Advanced Features
The ASTAT-CD Plus incorporates many additional advanced features
to insure suitability for most applications.
Monitoring
• Motor Current
• Line Voltage (1)
• Line Power Factor
• Elapsed Time
• Fault History
Protection
• Password
• Lockout
• Undervoltage (1)
• Overvoltage (1)
• Undercurrent
• Overcurrent
• Long Start Time
• Stalled Rotor
Secondary Functions
• Secondary Ramp Up
• Secondary Ramp Down
• Tachometer Feedback
• Dual Motor Switch
• Slow Speed (7&14%)
• Reverse Slow Speed (20%)
• Retry
• DC Injection Braking
• Energy Saving
The ASTAT-CD Plus also features two programmable inputs, three
programmable output relays and serial communications control.
Note: (1) Monitors L1