35 • Control Keypad
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7.6.5 Stop Parameters – page 3
STOP.
If current is still flowing after speed is softly
reduced to zero, increase FINAL TORQUE
setting.
7.6.5.1 Soft stop parameters
The RVS-DX incorporates 4 “Starting Curves”, enabling selection the suitable torque curve:
Stop Curve 0 – Standard curve (Default) – voltage is linearly reduced from nominal to zero.
The most stable and suitable curve for the motor, preventing prolonged stopping and motor overheating.
Stop curves 1, 2, 3 Pump Control – In some pump applications, when pumping to a higher level, a
considerable part of the torque is constant and does not decrease with speed.
It may happen that during deceleration process, when voltage is decreasing, motor torque quickly falls below
load torque abruptly (instead of smoothly decreasing speed to zero) closing the valve and causing Water
Hammer.
Curves 1, 2 and 3 are intended to prevent Water Hammer phenomenon. In pump applications, load torque
decreases in square relation to the speed, thus correct control of voltage reduction reduces torque adequately
to smoothly decelerate to a stop.
Note:
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