GE Industrial Solutions ASTAT BP - Manual (Page 32)

ASTAT BP User Manual
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Soft Start Curves 1-3 - Pump Control - Induction motors produce peak torque of up to 3 times the
rated torque towards the end of starting process. In some pump applications, this peak may cause a pressure
surge in the pipes.
Soft Start Curves 1, 2, 3 – During acceleration before reaching peak torque, the Pump Control
Program automatically controls the voltage ramp-up, thus, reducing peak torque.
Choice of four pump control acceleration curves: 0!, 1!, 2!, 3!
Soft Start Curve 4 (Torque) – Torque Controlled acceleration - This provides a smooth time-
controlled torque ramp for the motor and the pump.
Note:
Always start with Soft Start Curve 0. If towards the end of ramp, peak torque is too high (pressure is too
high) proceed to Soft Start Curve 1, 2, 3 or 4 in that order.