GE Industrial Solutions ASTAT BP - Manual (Page 54)

ASTAT BP User Manual
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66..22..33..11 Special Starting – Using DUAL Settings – Wiring Diagram
6.2.4 Choosing a Suitable Pump Curve (Centrifugal Pumps)
66..22..44..11 Starting Curve
• Adjust Main Settings as necessary (Starter Current, Motor Current, etc.).
• Set Soft Starting Curve, Ramp UP Time, Current Limit, and Starting Voltage to their
default values (curve 0, 10 sec., 400% and 30% respectively).
• Start the pump while watching the pressure gauge as the pump starts and look for overshooting (“pressure
surge”) of the gauge needle above the target pressure. In case of over pressure, choose a peak torque
reduction curve (Soft Start Curve 1!!).
• Set Soft Start Curve 1!!, increase Ramp UP Time to 15 seconds and reduce Current Limit to
350%. Start the pump and watch the pressure gauge while the pump starts.
• In most cases overshooting is reduced. If the overshoot persists, increase Ramp UP Time to 25 seconds
(confirm with the motor manufacturer) and try again.
• If overpressure persists, increase the Soft Start Curve setting to 2!! or 3!! if necessary. Each
increase in the Soft Start Curve setting will reduce the peak torque, thus reducing the overpressure
and preventing “pressure surge” during start.